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PrusaSlicer-NonPlainar/xs/src/libslic3r/SupportMaterial.cpp
bubnikv 61e6f23ed2 Fix of 
"Multimaterial printer switches filament at the wrong time during a print"
https://github.com/prusa3d/Slic3r/issues/607

There was a single layer between the raft top and the object first layer
missing on the wipe tower, and after this missing layer all the tool
changes were shifted by one layer, meaning two color print had the colors
switched.
2017-12-11 17:19:55 +01:00

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#include "ClipperUtils.hpp"
#include "ExtrusionEntityCollection.hpp"
#include "PerimeterGenerator.hpp"
#include "Layer.hpp"
#include "Print.hpp"
#include "SupportMaterial.hpp"
#include "Fill/FillBase.hpp"
#include "EdgeGrid.hpp"
#include "Geometry.hpp"
#include <cmath>
#include <memory>
#include <boost/log/trivial.hpp>
#include <tbb/parallel_for.h>
#include <tbb/atomic.h>
#include <tbb/spin_mutex.h>
#include <tbb/task_group.h>
// #define SLIC3R_DEBUG
// Make assert active if SLIC3R_DEBUG
#ifdef SLIC3R_DEBUG
#define DEBUG
#define _DEBUG
#undef NDEBUG
#include "SVG.hpp"
#endif
// #undef NDEBUG
#include <cassert>
namespace Slic3r {
// Increment used to reach MARGIN in steps to avoid trespassing thin objects
#define NUM_MARGIN_STEPS 3
// Dimensions of a tree-like structure to save material
#define PILLAR_SIZE (2.5)
#define PILLAR_SPACING 10
//#define SUPPORT_SURFACES_OFFSET_PARAMETERS ClipperLib::jtMiter, 3.
//#define SUPPORT_SURFACES_OFFSET_PARAMETERS ClipperLib::jtMiter, 1.5
#define SUPPORT_SURFACES_OFFSET_PARAMETERS ClipperLib::jtSquare, 0.
#ifdef SLIC3R_DEBUG
const char* support_surface_type_to_color_name(const PrintObjectSupportMaterial::SupporLayerType surface_type)
{
switch (surface_type) {
case PrintObjectSupportMaterial::sltTopContact: return "rgb(255,0,0)"; // "red";
case PrintObjectSupportMaterial::sltTopInterface: return "rgb(0,255,0)"; // "green";
case PrintObjectSupportMaterial::sltBase: return "rgb(0,0,255)"; // "blue";
case PrintObjectSupportMaterial::sltBottomInterface:return "rgb(255,255,128)"; // yellow
case PrintObjectSupportMaterial::sltBottomContact: return "rgb(255,0,255)"; // magenta
case PrintObjectSupportMaterial::sltRaftInterface: return "rgb(0,255,255)";
case PrintObjectSupportMaterial::sltRaftBase: return "rgb(128,128,128)";
case PrintObjectSupportMaterial::sltUnknown: return "rgb(128,0,0)"; // maroon
default: return "rgb(64,64,64)";
};
}
Point export_support_surface_type_legend_to_svg_box_size()
{
return Point(scale_(1.+10.*8.), scale_(3.));
}
void export_support_surface_type_legend_to_svg(SVG &svg, const Point &pos)
{
// 1st row
coord_t pos_x0 = pos.x + scale_(1.);
coord_t pos_x = pos_x0;
coord_t pos_y = pos.y + scale_(1.5);
coord_t step_x = scale_(10.);
svg.draw_legend(Point(pos_x, pos_y), "top contact" , support_surface_type_to_color_name(PrintObjectSupportMaterial::sltTopContact));
pos_x += step_x;
svg.draw_legend(Point(pos_x, pos_y), "top iface" , support_surface_type_to_color_name(PrintObjectSupportMaterial::sltTopInterface));
pos_x += step_x;
svg.draw_legend(Point(pos_x, pos_y), "base" , support_surface_type_to_color_name(PrintObjectSupportMaterial::sltBase));
pos_x += step_x;
svg.draw_legend(Point(pos_x, pos_y), "bottom iface" , support_surface_type_to_color_name(PrintObjectSupportMaterial::sltBottomInterface));
pos_x += step_x;
svg.draw_legend(Point(pos_x, pos_y), "bottom contact" , support_surface_type_to_color_name(PrintObjectSupportMaterial::sltBottomContact));
// 2nd row
pos_x = pos_x0;
pos_y = pos.y+scale_(2.8);
svg.draw_legend(Point(pos_x, pos_y), "raft interface" , support_surface_type_to_color_name(PrintObjectSupportMaterial::sltRaftInterface));
pos_x += step_x;
svg.draw_legend(Point(pos_x, pos_y), "raft base" , support_surface_type_to_color_name(PrintObjectSupportMaterial::sltRaftBase));
pos_x += step_x;
svg.draw_legend(Point(pos_x, pos_y), "unknown" , support_surface_type_to_color_name(PrintObjectSupportMaterial::sltUnknown));
pos_x += step_x;
svg.draw_legend(Point(pos_x, pos_y), "intermediate" , support_surface_type_to_color_name(PrintObjectSupportMaterial::sltIntermediate));
}
void export_print_z_polygons_to_svg(const char *path, PrintObjectSupportMaterial::MyLayer ** const layers, size_t n_layers)
{
BoundingBox bbox;
for (int i = 0; i < n_layers; ++ i)
bbox.merge(get_extents(layers[i]->polygons));
Point legend_size = export_support_surface_type_legend_to_svg_box_size();
Point legend_pos(bbox.min.x, bbox.max.y);
bbox.merge(Point(std::max(bbox.min.x + legend_size.x, bbox.max.x), bbox.max.y + legend_size.y));
SVG svg(path, bbox);
const float transparency = 0.5f;
for (int i = 0; i < n_layers; ++ i)
svg.draw(union_ex(layers[i]->polygons), support_surface_type_to_color_name(layers[i]->layer_type), transparency);
for (int i = 0; i < n_layers; ++ i)
svg.draw(to_polylines(layers[i]->polygons), support_surface_type_to_color_name(layers[i]->layer_type));
export_support_surface_type_legend_to_svg(svg, legend_pos);
svg.Close();
}
void export_print_z_polygons_and_extrusions_to_svg(
const char *path,
PrintObjectSupportMaterial::MyLayer ** const layers,
size_t n_layers,
SupportLayer &support_layer)
{
BoundingBox bbox;
for (int i = 0; i < n_layers; ++ i)
bbox.merge(get_extents(layers[i]->polygons));
Point legend_size = export_support_surface_type_legend_to_svg_box_size();
Point legend_pos(bbox.min.x, bbox.max.y);
bbox.merge(Point(std::max(bbox.min.x + legend_size.x, bbox.max.x), bbox.max.y + legend_size.y));
SVG svg(path, bbox);
const float transparency = 0.5f;
for (int i = 0; i < n_layers; ++ i)
svg.draw(union_ex(layers[i]->polygons), support_surface_type_to_color_name(layers[i]->layer_type), transparency);
for (int i = 0; i < n_layers; ++ i)
svg.draw(to_polylines(layers[i]->polygons), support_surface_type_to_color_name(layers[i]->layer_type));
Polygons polygons_support, polygons_interface;
support_layer.support_fills.polygons_covered_by_width(polygons_support, SCALED_EPSILON);
// support_layer.support_interface_fills.polygons_covered_by_width(polygons_interface, SCALED_EPSILON);
svg.draw(union_ex(polygons_support), "brown");
svg.draw(union_ex(polygons_interface), "black");
export_support_surface_type_legend_to_svg(svg, legend_pos);
svg.Close();
}
#endif /* SLIC3R_DEBUG */
PrintObjectSupportMaterial::PrintObjectSupportMaterial(const PrintObject *object, const SlicingParameters &slicing_params) :
m_object (object),
m_print_config (&object->print()->config),
m_object_config (&object->config),
m_slicing_params (slicing_params),
m_first_layer_flow (support_material_1st_layer_flow(object, float(slicing_params.first_print_layer_height))),
m_support_material_flow (support_material_flow(object, float(slicing_params.layer_height))),
m_support_material_interface_flow(support_material_interface_flow(object, float(slicing_params.layer_height))),
m_support_layer_height_min(0.01)
{
// Calculate a minimum support layer height as a minimum over all extruders, but not smaller than 10um.
m_support_layer_height_min = 1000000.;
for (auto lh : m_print_config->min_layer_height.values)
m_support_layer_height_min = std::min(m_support_layer_height_min, std::max(0.01, lh));
if (m_object_config->support_material_interface_layers.value == 0) {
// No interface layers allowed, print everything with the base support pattern.
m_support_material_interface_flow = m_support_material_flow;
}
// Evaluate the XY gap between the object outer perimeters and the support structures.
coordf_t external_perimeter_width = 0.;
for (size_t region_id = 0; region_id < object->region_volumes.size(); ++ region_id) {
if (! object->region_volumes[region_id].empty()) {
const PrintRegionConfig &config = object->print()->get_region(region_id)->config;
coordf_t width = config.external_perimeter_extrusion_width.get_abs_value(slicing_params.layer_height);
if (width <= 0.)
width = m_print_config->nozzle_diameter.get_at(config.perimeter_extruder-1);
external_perimeter_width = std::max(external_perimeter_width, width);
}
}
m_gap_xy = m_object_config->support_material_xy_spacing.get_abs_value(external_perimeter_width);
m_can_merge_support_regions = m_object_config->support_material_extruder.value == m_object_config->support_material_interface_extruder.value;
if (! m_can_merge_support_regions && (m_object_config->support_material_extruder.value == 0 || m_object_config->support_material_interface_extruder.value == 0)) {
// One of the support extruders is of "don't care" type.
auto object_extruders = m_object->print()->object_extruders();
if (object_extruders.size() == 1 &&
*object_extruders.begin() == std::max<unsigned int>(m_object_config->support_material_extruder.value, m_object_config->support_material_interface_extruder.value))
// Object is printed with the same extruder as the support.
m_can_merge_support_regions = true;
}
}
// Using the std::deque as an allocator.
inline PrintObjectSupportMaterial::MyLayer& layer_allocate(
std::deque<PrintObjectSupportMaterial::MyLayer> &layer_storage,
PrintObjectSupportMaterial::SupporLayerType layer_type)
{
layer_storage.push_back(PrintObjectSupportMaterial::MyLayer());
layer_storage.back().layer_type = layer_type;
return layer_storage.back();
}
inline PrintObjectSupportMaterial::MyLayer& layer_allocate(
std::deque<PrintObjectSupportMaterial::MyLayer> &layer_storage,
tbb::spin_mutex &layer_storage_mutex,
PrintObjectSupportMaterial::SupporLayerType layer_type)
{
layer_storage_mutex.lock();
layer_storage.push_back(PrintObjectSupportMaterial::MyLayer());
PrintObjectSupportMaterial::MyLayer *layer_new = &layer_storage.back();
layer_storage_mutex.unlock();
layer_new->layer_type = layer_type;
return *layer_new;
}
inline void layers_append(PrintObjectSupportMaterial::MyLayersPtr &dst, const PrintObjectSupportMaterial::MyLayersPtr &src)
{
dst.insert(dst.end(), src.begin(), src.end());
}
// Compare layers lexicographically.
struct MyLayersPtrCompare
{
bool operator()(const PrintObjectSupportMaterial::MyLayer* layer1, const PrintObjectSupportMaterial::MyLayer* layer2) const {
return *layer1 < *layer2;
}
};
void PrintObjectSupportMaterial::generate(PrintObject &object)
{
BOOST_LOG_TRIVIAL(info) << "Support generator - Start";
coordf_t max_object_layer_height = 0.;
for (size_t i = 0; i < object.layer_count(); ++ i)
max_object_layer_height = std::max(max_object_layer_height, object.layers[i]->height);
// Layer instances will be allocated by std::deque and they will be kept until the end of this function call.
// The layers will be referenced by various LayersPtr (of type std::vector<Layer*>)
MyLayerStorage layer_storage;
BOOST_LOG_TRIVIAL(info) << "Support generator - Creating top contacts";
// Determine the top contact surfaces of the support, defined as:
// contact = overhangs - clearance + margin
// This method is responsible for identifying what contact surfaces
// should the support material expose to the object in order to guarantee
// that it will be effective, regardless of how it's built below.
// If raft is to be generated, the 1st top_contact layer will contain the 1st object layer silhouette without holes.
MyLayersPtr top_contacts = this->top_contact_layers(object, layer_storage);
if (top_contacts.empty())
// Nothing is supported, no supports are generated.
return;
#ifdef SLIC3R_DEBUG
static int iRun = 0;
iRun ++;
for (MyLayersPtr::const_iterator it = top_contacts.begin(); it != top_contacts.end(); ++ it)
Slic3r::SVG::export_expolygons(
debug_out_path("support-top-contacts-%d-%lf.svg", iRun, (*it)->print_z),
union_ex((*it)->polygons, false));
#endif /* SLIC3R_DEBUG */
BOOST_LOG_TRIVIAL(info) << "Support generator - Creating bottom contacts";
// Determine the bottom contact surfaces of the supports over the top surfaces of the object.
// Depending on whether the support is soluble or not, the contact layer thickness is decided.
// layer_support_areas contains the per object layer support areas. These per object layer support areas
// may get merged and trimmed by this->generate_base_layers() if the support layers are not synchronized with object layers.
std::vector<Polygons> layer_support_areas;
MyLayersPtr bottom_contacts = this->bottom_contact_layers_and_layer_support_areas(
object, top_contacts, layer_storage,
layer_support_areas);
#ifdef SLIC3R_DEBUG
for (size_t layer_id = 0; layer_id < object.layers.size(); ++ layer_id)
Slic3r::SVG::export_expolygons(
debug_out_path("support-areas-%d-%lf.svg", iRun, object.layers[layer_id]->print_z),
union_ex(layer_support_areas[layer_id], false));
#endif /* SLIC3R_DEBUG */
BOOST_LOG_TRIVIAL(info) << "Support generator - Creating intermediate layers - indices";
// Allocate empty layers between the top / bottom support contact layers
// as placeholders for the base and intermediate support layers.
// The layers may or may not be synchronized with the object layers, depending on the configuration.
// For example, a single nozzle multi material printing will need to generate a waste tower, which in turn
// wastes less material, if there are as little tool changes as possible.
MyLayersPtr intermediate_layers = this->raft_and_intermediate_support_layers(
object, bottom_contacts, top_contacts, layer_storage);
this->trim_support_layers_by_object(object, top_contacts, m_slicing_params.soluble_interface ? 0. : m_support_layer_height_min, 0., m_gap_xy);
BOOST_LOG_TRIVIAL(info) << "Support generator - Creating base layers";
// Fill in intermediate layers between the top / bottom support contact layers, trimm them by the object.
this->generate_base_layers(object, bottom_contacts, top_contacts, intermediate_layers, layer_support_areas);
#ifdef SLIC3R_DEBUG
for (MyLayersPtr::const_iterator it = intermediate_layers.begin(); it != intermediate_layers.end(); ++ it)
Slic3r::SVG::export_expolygons(
debug_out_path("support-base-layers-%d-%lf.svg", iRun, (*it)->print_z),
union_ex((*it)->polygons, false));
#endif /* SLIC3R_DEBUG */
BOOST_LOG_TRIVIAL(info) << "Support generator - Trimming top contacts by bottom contacts";
// Because the top and bottom contacts are thick slabs, they may overlap causing over extrusion
// and unwanted strong bonds to the object.
// Rather trim the top contacts by their overlapping bottom contacts to leave a gap instead of over extruding
// top contacts over the bottom contacts.
this->trim_top_contacts_by_bottom_contacts(object, bottom_contacts, top_contacts);
BOOST_LOG_TRIVIAL(info) << "Support generator - Creating interfaces";
// Propagate top / bottom contact layers to generate interface layers.
MyLayersPtr interface_layers = this->generate_interface_layers(
bottom_contacts, top_contacts, intermediate_layers, layer_storage);
BOOST_LOG_TRIVIAL(info) << "Support generator - Creating raft";
// If raft is to be generated, the 1st top_contact layer will contain the 1st object layer silhouette with holes filled.
// There is also a 1st intermediate layer containing bases of support columns.
// Inflate the bases of the support columns and create the raft base under the object.
MyLayersPtr raft_layers = this->generate_raft_base(top_contacts, interface_layers, intermediate_layers, layer_storage);
#ifdef SLIC3R_DEBUG
for (MyLayersPtr::const_iterator it = interface_layers.begin(); it != interface_layers.end(); ++ it)
Slic3r::SVG::export_expolygons(
debug_out_path("support-interface-layers-%d-%lf.svg", iRun, (*it)->print_z),
union_ex((*it)->polygons, false));
#endif /* SLIC3R_DEBUG */
/*
// Clip with the pillars.
if (! shape.empty()) {
this->clip_with_shape(interface, shape);
this->clip_with_shape(base, shape);
}
*/
BOOST_LOG_TRIVIAL(info) << "Support generator - Creating layers";
// For debugging purposes, one may want to show only some of the support extrusions.
// raft_layers.clear();
// bottom_contacts.clear();
// top_contacts.clear();
// intermediate_layers.clear();
// interface_layers.clear();
// Install support layers into the object.
// A support layer installed on a PrintObject has a unique print_z.
MyLayersPtr layers_sorted;
layers_sorted.reserve(raft_layers.size() + bottom_contacts.size() + top_contacts.size() + intermediate_layers.size() + interface_layers.size());
layers_append(layers_sorted, raft_layers);
layers_append(layers_sorted, bottom_contacts);
layers_append(layers_sorted, top_contacts);
layers_append(layers_sorted, intermediate_layers);
layers_append(layers_sorted, interface_layers);
// Sort the layers lexicographically by a raising print_z and a decreasing height.
std::sort(layers_sorted.begin(), layers_sorted.end(), MyLayersPtrCompare());
int layer_id = 0;
assert(object.support_layers.empty());
for (int i = 0; i < int(layers_sorted.size());) {
// Find the last layer with roughly the same print_z, find the minimum layer height of all.
// Due to the floating point inaccuracies, the print_z may not be the same even if in theory they should.
int j = i + 1;
coordf_t zmax = layers_sorted[i]->print_z + EPSILON;
for (; j < layers_sorted.size() && layers_sorted[j]->print_z <= zmax; ++j) ;
// Assign an average print_z to the set of layers with nearly equal print_z.
coordf_t zavg = 0.5 * (layers_sorted[i]->print_z + layers_sorted[j - 1]->print_z);
coordf_t height_min = layers_sorted[i]->height;
bool empty = true;
for (int u = i; u < j; ++u) {
MyLayer &layer = *layers_sorted[u];
if (! layer.polygons.empty())
empty = false;
layer.print_z = zavg;
height_min = std::min(height_min, layer.height);
}
if (! empty) {
// Here the upper_layer and lower_layer pointers are left to null at the support layers,
// as they are never used. These pointers are candidates for removal.
object.add_support_layer(layer_id ++, height_min, zavg);
}
i = j;
}
BOOST_LOG_TRIVIAL(info) << "Support generator - Generating tool paths";
// Generate the actual toolpaths and save them into each layer.
this->generate_toolpaths(object, raft_layers, bottom_contacts, top_contacts, intermediate_layers, interface_layers);
#ifdef SLIC3R_DEBUG
{
size_t layer_id = 0;
for (int i = 0; i < int(layers_sorted.size());) {
// Find the last layer with roughly the same print_z, find the minimum layer height of all.
// Due to the floating point inaccuracies, the print_z may not be the same even if in theory they should.
int j = i + 1;
coordf_t zmax = layers_sorted[i]->print_z + EPSILON;
bool empty = true;
for (; j < layers_sorted.size() && layers_sorted[j]->print_z <= zmax; ++j)
if (! layers_sorted[j]->polygons.empty())
empty = false;
if (! empty) {
export_print_z_polygons_to_svg(
debug_out_path("support-%d-%lf.svg", iRun, layers_sorted[i]->print_z).c_str(),
layers_sorted.data() + i, j - i);
export_print_z_polygons_and_extrusions_to_svg(
debug_out_path("support-w-fills-%d-%lf.svg", iRun, layers_sorted[i]->print_z).c_str(),
layers_sorted.data() + i, j - i,
*object.support_layers[layer_id]);
++layer_id;
}
i = j;
}
}
#endif /* SLIC3R_DEBUG */
BOOST_LOG_TRIVIAL(info) << "Support generator - End";
}
// Collect all polygons of all regions in a layer with a given surface type.
Polygons collect_region_slices_by_type(const Layer &layer, SurfaceType surface_type)
{
// 1) Count the new polygons first.
size_t n_polygons_new = 0;
for (LayerRegionPtrs::const_iterator it_region = layer.regions.begin(); it_region != layer.regions.end(); ++ it_region) {
const LayerRegion &region = *(*it_region);
const SurfaceCollection &slices = region.slices;
for (Surfaces::const_iterator it = slices.surfaces.begin(); it != slices.surfaces.end(); ++ it) {
const Surface &surface = *it;
if (surface.surface_type == surface_type)
n_polygons_new += surface.expolygon.holes.size() + 1;
}
}
// 2) Collect the new polygons.
Polygons out;
out.reserve(n_polygons_new);
for (LayerRegionPtrs::const_iterator it_region = layer.regions.begin(); it_region != layer.regions.end(); ++ it_region) {
const LayerRegion &region = *(*it_region);
const SurfaceCollection &slices = region.slices;
for (Surfaces::const_iterator it = slices.surfaces.begin(); it != slices.surfaces.end(); ++ it) {
const Surface &surface = *it;
if (surface.surface_type == surface_type)
polygons_append(out, surface.expolygon);
}
}
return out;
}
// Collect outer contours of all slices of this layer.
// This is useful for calculating the support base with holes filled.
Polygons collect_slices_outer(const Layer &layer)
{
Polygons out;
out.reserve(out.size() + layer.slices.expolygons.size());
for (ExPolygons::const_iterator it = layer.slices.expolygons.begin(); it != layer.slices.expolygons.end(); ++ it)
out.push_back(it->contour);
return out;
}
class SupportGridPattern
{
public:
SupportGridPattern(
const Polygons &support_polygons,
const Polygons &trimming_polygons,
coordf_t support_spacing,
coordf_t support_angle) :
m_support_polygons(&support_polygons), m_trimming_polygons(&trimming_polygons),
m_support_spacing(support_spacing), m_support_angle(support_angle)
{
if (m_support_angle != 0.) {
// Create a copy of the rotated contours.
m_support_polygons_rotated = support_polygons;
m_trimming_polygons_rotated = trimming_polygons;
m_support_polygons = &m_support_polygons_rotated;
m_trimming_polygons = &m_trimming_polygons_rotated;
polygons_rotate(m_support_polygons_rotated, - support_angle);
polygons_rotate(m_trimming_polygons_rotated, - support_angle);
}
// Create an EdgeGrid, initialize it with projection, initialize signed distance field.
coord_t grid_resolution = coord_t(scale_(m_support_spacing));
BoundingBox bbox = get_extents(*m_support_polygons);
bbox.offset(20);
bbox.align_to_grid(grid_resolution);
m_grid.set_bbox(bbox);
m_grid.create(*m_support_polygons, grid_resolution);
m_grid.calculate_sdf();
// Extract a bounding contour from the grid, trim by the object.
m_island_samples = island_samples(*m_support_polygons);
}
// Extract polygons from the grid, offsetted by offset_in_grid,
// and trim the extracted polygons by trimming_polygons.
// Trimming by the trimming_polygons may split the extracted polygons into pieces.
// Remove all the pieces, which do not contain any of the island_samples.
Polygons extract_support(const coord_t offset_in_grid)
{
// Generate islands, so each island may be tested for overlap with m_island_samples.
ExPolygons islands = diff_ex(
m_grid.contours_simplified(offset_in_grid),
*m_trimming_polygons, false);
// Extract polygons, which contain some of the m_island_samples.
Polygons out;
std::vector<std::pair<Point,bool>> samples_inside;
for (ExPolygon &island : islands) {
BoundingBox bbox = get_extents(island.contour);
auto it_lower = std::lower_bound(m_island_samples.begin(), m_island_samples.end(), bbox.min - Point(1, 1));
auto it_upper = std::upper_bound(m_island_samples.begin(), m_island_samples.end(), bbox.max + Point(1, 1));
samples_inside.clear();
for (auto it = it_lower; it != it_upper; ++ it)
if (bbox.contains(*it))
samples_inside.push_back(std::make_pair(*it, false));
if (! samples_inside.empty()) {
// For all samples_inside count the boundary crossing.
for (size_t i_contour = 0; i_contour <= island.holes.size(); ++ i_contour) {
Polygon &contour = (i_contour == 0) ? island.contour : island.holes[i_contour - 1];
Points::const_iterator i = contour.points.begin();
Points::const_iterator j = contour.points.end() - 1;
for (; i != contour.points.end(); j = i ++) {
//FIXME this test is not numerically robust. Particularly, it does not handle horizontal segments at y == point.y well.
// Does the ray with y == point.y intersect this line segment?
for (auto &sample_inside : samples_inside) {
if ((i->y > sample_inside.first.y) != (j->y > sample_inside.first.y)) {
double x1 = (double)sample_inside.first.x;
double x2 = (double)i->x + (double)(j->x - i->x) * (double)(sample_inside.first.y - i->y) / (double)(j->y - i->y);
if (x1 < x2)
sample_inside.second = !sample_inside.second;
}
}
}
}
// If any of the sample is inside this island, add this island to the output.
for (auto &sample_inside : samples_inside)
if (sample_inside.second) {
polygons_append(out, std::move(island));
island.clear();
break;
}
}
}
#ifdef SLIC3R_DEBUG
static int iRun = 0;
++iRun;
BoundingBox bbox = get_extents(*m_trimming_polygons);
if (! islands.empty())
bbox.merge(get_extents(islands));
if (!out.empty())
bbox.merge(get_extents(out));
SVG svg(debug_out_path("extract_support_from_grid_trimmed-%d.svg", iRun).c_str(), bbox);
svg.draw(islands, "red", 0.5f);
svg.draw(union_ex(out), "green", 0.5f);
svg.draw(union_ex(*m_support_polygons), "blue", 0.5f);
svg.draw_outline(islands, "red", "red", scale_(0.05));
svg.draw_outline(union_ex(out), "green", "green", scale_(0.05));
svg.draw_outline(union_ex(*m_support_polygons), "blue", "blue", scale_(0.05));
for (const Point &pt : m_island_samples)
svg.draw(pt, "black", coord_t(scale_(0.15)));
svg.Close();
#endif /* SLIC3R_DEBUG */
if (m_support_angle != 0.)
polygons_rotate(out, m_support_angle);
return out;
}
private:
SupportGridPattern& operator=(const SupportGridPattern &rhs);
// Get some internal point of an expolygon, to be used as a representative
// sample to test, whether this island is inside another island.
static Point island_sample(const ExPolygon &expoly)
{
// Find the lowest point lexicographically.
const Point *pt_min = &expoly.contour.points.front();
for (size_t i = 1; i < expoly.contour.points.size(); ++ i)
if (expoly.contour.points[i] < *pt_min)
pt_min = &expoly.contour.points[i];
// Lowest corner will always be convex, in worst case denegenerate with zero angle.
const Point &p1 = (pt_min == &expoly.contour.points.front()) ? expoly.contour.points.back() : *(pt_min - 1);
const Point &p2 = *pt_min;
const Point &p3 = (pt_min == &expoly.contour.points.back()) ? expoly.contour.points.front() : *(pt_min + 1);
Vector v = (p3 - p2) + (p1 - p2);
double l2 = double(v.x)*double(v.x)+double(v.y)*double(v.y);
if (l2 == 0.)
return p2;
double coef = 20. / sqrt(l2);
return Point(p2.x + coef * v.x, p2.y + coef * v.y);
}
static Points island_samples(const ExPolygons &expolygons)
{
Points pts;
pts.reserve(expolygons.size());
for (const ExPolygon &expoly : expolygons)
if (expoly.contour.points.size() > 2) {
#if 0
pts.push_back(island_sample(expoly));
#else
Polygons polygons = offset(expoly, - 20.f);
for (const Polygon &poly : polygons)
if (! poly.points.empty()) {
pts.push_back(poly.points.front());
break;
}
#endif
}
// Sort the points lexicographically, so a binary search could be used to locate points inside a bounding box.
std::sort(pts.begin(), pts.end());
return pts;
}
static Points island_samples(const Polygons &polygons)
{
return island_samples(union_ex(polygons));
}
const Polygons *m_support_polygons;
const Polygons *m_trimming_polygons;
Polygons m_support_polygons_rotated;
Polygons m_trimming_polygons_rotated;
// Angle in radians, by which the whole support is rotated.
coordf_t m_support_angle;
// X spacing of the support lines parallel with the Y axis.
coordf_t m_support_spacing;
Slic3r::EdgeGrid::Grid m_grid;
Points m_island_samples;
};
// Generate top contact layers supporting overhangs.
// For a soluble interface material synchronize the layer heights with the object, otherwise leave the layer height undefined.
// If supports over bed surface only are requested, don't generate contact layers over an object.
PrintObjectSupportMaterial::MyLayersPtr PrintObjectSupportMaterial::top_contact_layers(
const PrintObject &object, MyLayerStorage &layer_storage) const
{
#ifdef SLIC3R_DEBUG
static int iRun = 0;
++ iRun;
#endif /* SLIC3R_DEBUG */
// Output layers, sorted by top Z.
MyLayersPtr contact_out;
// If user specified a custom angle threshold, convert it to radians.
// Zero means automatic overhang detection.
const double threshold_rad = (m_object_config->support_material_threshold.value > 0) ?
M_PI * double(m_object_config->support_material_threshold.value + 1) / 180. : // +1 makes the threshold inclusive
0.;
// Build support on a build plate only? If so, then collect and union all the surfaces below the current layer.
// Unfortunately this is an inherently serial process.
const bool buildplate_only = this->build_plate_only();
std::vector<Polygons> buildplate_covered;
if (buildplate_only) {
BOOST_LOG_TRIVIAL(debug) << "PrintObjectSupportMaterial::top_contact_layers() - collecting regions covering the print bed.";
buildplate_covered.assign(object.layers.size(), Polygons());
for (size_t layer_id = 1; layer_id < object.layers.size(); ++ layer_id) {
const Layer &lower_layer = *object.layers[layer_id-1];
// Merge the new slices with the preceding slices.
// Apply the safety offset to the newly added polygons, so they will connect
// with the polygons collected before,
// but don't apply the safety offset during the union operation as it would
// inflate the polygons over and over.
Polygons &covered = buildplate_covered[layer_id];
covered = buildplate_covered[layer_id - 1];
polygons_append(covered, offset(lower_layer.slices.expolygons, scale_(0.01)));
covered = union_(covered, false); // don't apply the safety offset.
}
}
BOOST_LOG_TRIVIAL(debug) << "PrintObjectSupportMaterial::top_contact_layers() in parallel - start";
// Determine top contact areas.
// If generating raft only (no support), only calculate top contact areas for the 0th layer.
// If having a raft, start with 0th layer, otherwise with 1st layer.
// Note that layer_id < layer->id when raft_layers > 0 as the layer->id incorporates the raft layers.
// So layer_id == 0 means first object layer and layer->id == 0 means first print layer if there are no explicit raft layers.
size_t num_layers = this->has_support() ? object.layer_count() : 1;
contact_out.assign(num_layers, nullptr);
tbb::spin_mutex layer_storage_mutex;
tbb::parallel_for(tbb::blocked_range<size_t>(this->has_raft() ? 0 : 1, num_layers),
[this, &object, &buildplate_covered, threshold_rad, &layer_storage, &layer_storage_mutex, &contact_out](const tbb::blocked_range<size_t>& range) {
for (size_t layer_id = range.begin(); layer_id < range.end(); ++ layer_id)
{
const Layer &layer = *object.layers[layer_id];
// Detect overhangs and contact areas needed to support them.
// Collect overhangs and contacts of all regions of this layer supported by the layer immediately below.
Polygons overhang_polygons;
Polygons contact_polygons;
Polygons slices_margin_cached;
float slices_margin_cached_offset = -1.;
if (layer_id == 0) {
// This is the first object layer, so the object is being printed on a raft and
// we're here just to get the object footprint for the raft.
// We only consider contours and discard holes to get a more continuous raft.
overhang_polygons = collect_slices_outer(layer);
// Extend by SUPPORT_MATERIAL_MARGIN, which is 1.5mm
contact_polygons = offset(overhang_polygons, scale_(SUPPORT_MATERIAL_MARGIN));
} else {
// Generate overhang / contact_polygons for non-raft layers.
const Layer &lower_layer = *object.layers[layer_id-1];
for (LayerRegion *layerm : layer.regions) {
// Extrusion width accounts for the roundings of the extrudates.
// It is the maximum widh of the extrudate.
float fw = float(layerm->flow(frExternalPerimeter).scaled_width());
float lower_layer_offset =
(layer_id < this->m_object_config->support_material_enforce_layers.value) ?
// Enforce a full possible support, ignore the overhang angle.
0.f :
(threshold_rad > 0. ?
// Overhang defined by an angle.
float(scale_(lower_layer.height / tan(threshold_rad))) :
// Overhang defined by half the extrusion width.
0.5f * fw);
// Overhang polygons for this layer and region.
Polygons diff_polygons;
Polygons layerm_polygons = to_polygons(layerm->slices);
Polygons lower_layer_polygons = to_polygons(lower_layer.slices.expolygons);
if (lower_layer_offset == 0.f) {
// Support everything.
diff_polygons = diff(layerm_polygons, lower_layer_polygons);
if (! buildplate_covered.empty()) {
// Don't support overhangs above the top surfaces.
// This step is done before the contact surface is calculated by growing the overhang region.
diff_polygons = diff(diff_polygons, buildplate_covered[layer_id]);
}
} else {
// Get the regions needing a suport, collapse very tiny spots.
//FIXME cache the lower layer offset if this layer has multiple regions.
diff_polygons = offset2(
diff(layerm_polygons,
offset(lower_layer_polygons, lower_layer_offset, SUPPORT_SURFACES_OFFSET_PARAMETERS)),
-0.1f*fw, +0.1f*fw);
if (! buildplate_covered.empty()) {
// Don't support overhangs above the top surfaces.
// This step is done before the contact surface is calculated by growing the overhang region.
diff_polygons = diff(diff_polygons, buildplate_covered[layer_id]);
}
if (diff_polygons.empty())
continue;
// Offset the support regions back to a full overhang, restrict them to the full overhang.
diff_polygons = diff(
intersection(offset(diff_polygons, lower_layer_offset, SUPPORT_SURFACES_OFFSET_PARAMETERS), layerm_polygons),
lower_layer_polygons);
}
if (diff_polygons.empty())
continue;
#ifdef SLIC3R_DEBUG
{
::Slic3r::SVG svg(debug_out_path("support-top-contacts-raw-run%d-layer%d-region%d.svg",
iRun, layer_id,
std::find_if(layer.regions.begin(), layer.regions.end(), [layerm](const LayerRegion* other){return other == layerm;}) - layer.regions.begin()),
get_extents(diff_polygons));
Slic3r::ExPolygons expolys = union_ex(diff_polygons, false);
svg.draw(expolys);
}
#endif /* SLIC3R_DEBUG */
if (this->m_object_config->dont_support_bridges) {
// compute the area of bridging perimeters
// Note: this is duplicate code from GCode.pm, we need to refactor
if (true) {
Polygons bridged_perimeters;
{
Flow bridge_flow = layerm->flow(frPerimeter, true);
coordf_t nozzle_diameter = m_print_config->nozzle_diameter.get_at(layerm->region()->config.perimeter_extruder-1);
Polygons lower_grown_slices = offset(lower_layer_polygons, 0.5f*float(scale_(nozzle_diameter)), SUPPORT_SURFACES_OFFSET_PARAMETERS);
// Collect perimeters of this layer.
// TODO: split_at_first_point() could split a bridge mid-way
Polylines overhang_perimeters;
for (ExtrusionEntity* extrusion_entity : layerm->perimeters.entities) {
const ExtrusionEntityCollection *island = dynamic_cast<ExtrusionEntityCollection*>(extrusion_entity);
assert(island != NULL);
for (size_t i = 0; i < island->entities.size(); ++ i) {
ExtrusionEntity *entity = island->entities[i];
ExtrusionLoop *loop = dynamic_cast<Slic3r::ExtrusionLoop*>(entity);
overhang_perimeters.push_back(loop ?
loop->as_polyline() :
dynamic_cast<const Slic3r::ExtrusionPath*>(entity)->polyline);
}
}
// workaround for Clipper bug, see Slic3r::Polygon::clip_as_polyline()
for (Polyline &polyline : overhang_perimeters)
polyline.points[0].x += 1;
// Trim the perimeters of this layer by the lower layer to get the unsupported pieces of perimeters.
overhang_perimeters = diff_pl(overhang_perimeters, lower_grown_slices);
// only consider straight overhangs
// only consider overhangs having endpoints inside layer's slices
// convert bridging polylines into polygons by inflating them with their thickness
// since we're dealing with bridges, we can't assume width is larger than spacing,
// so we take the largest value and also apply safety offset to be ensure no gaps
// are left in between
float w = float(std::max(bridge_flow.scaled_width(), bridge_flow.scaled_spacing()));
for (Polyline &polyline : overhang_perimeters)
if (polyline.is_straight()) {
// This is a bridge
polyline.extend_start(fw);
polyline.extend_end(fw);
// Is the straight perimeter segment supported at both sides?
if (layer.slices.contains(polyline.first_point()) && layer.slices.contains(polyline.last_point()))
// Offset a polyline into a thick line.
polygons_append(bridged_perimeters, offset(polyline, 0.5f * w + 10.f));
}
bridged_perimeters = union_(bridged_perimeters);
}
// remove the entire bridges and only support the unsupported edges
Polygons bridges;
for (const Surface &surface : layerm->fill_surfaces.surfaces)
if (surface.surface_type == stBottomBridge && surface.bridge_angle != -1)
polygons_append(bridges, surface.expolygon);
diff_polygons = diff(diff_polygons, bridges, true);
polygons_append(bridges, bridged_perimeters);
polygons_append(diff_polygons,
intersection(
// Offset unsupported edges into polygons.
offset(layerm->unsupported_bridge_edges.polylines, scale_(SUPPORT_MATERIAL_MARGIN), SUPPORT_SURFACES_OFFSET_PARAMETERS),
bridges));
} else {
// just remove bridged areas
diff_polygons = diff(diff_polygons, layerm->bridged, true);
}
} // if (m_objconfig->dont_support_bridges)
if (diff_polygons.empty())
continue;
#ifdef SLIC3R_DEBUG
Slic3r::SVG::export_expolygons(
debug_out_path("support-top-contacts-filtered-run%d-layer%d-region%d-z%f.svg",
iRun, layer_id,
std::find_if(layer.regions.begin(), layer.regions.end(), [layerm](const LayerRegion* other){return other == layerm;}) - layer.regions.begin(),
layer.print_z),
union_ex(diff_polygons, false));
#endif /* SLIC3R_DEBUG */
if (this->has_contact_loops())
polygons_append(overhang_polygons, diff_polygons);
// Let's define the required contact area by using a max gap of half the upper
// extrusion width and extending the area according to the configured margin.
// We increment the area in steps because we don't want our support to overflow
// on the other side of the object (if it's very thin).
{
//FIMXE 1) Make the offset configurable, 2) Make the Z span configurable.
float slices_margin_offset = std::min(lower_layer_offset, float(scale_(m_gap_xy)));
if (slices_margin_cached_offset != slices_margin_offset) {
slices_margin_cached_offset = slices_margin_offset;
slices_margin_cached = (slices_margin_offset == 0.f) ?
to_polygons(lower_layer.slices.expolygons) :
offset(lower_layer.slices.expolygons, slices_margin_offset, SUPPORT_SURFACES_OFFSET_PARAMETERS);
if (! buildplate_covered.empty()) {
// Trim the inflated contact surfaces by the top surfaces as well.
polygons_append(slices_margin_cached, buildplate_covered[layer_id]);
slices_margin_cached = union_(slices_margin_cached);
}
}
// Offset the contact polygons outside.
for (size_t i = 0; i < NUM_MARGIN_STEPS; ++ i) {
diff_polygons = diff(
offset(
diff_polygons,
SUPPORT_MATERIAL_MARGIN / NUM_MARGIN_STEPS,
ClipperLib::jtRound,
// round mitter limit
scale_(0.05)),
slices_margin_cached);
}
}
polygons_append(contact_polygons, diff_polygons);
} // for each layer.region
} // end of Generate overhang/contact_polygons for non-raft layers.
// now apply the contact areas to the layer were they need to be made
if (! contact_polygons.empty()) {
// get the average nozzle diameter used on this layer
MyLayer &new_layer = layer_allocate(layer_storage, layer_storage_mutex, sltTopContact);
new_layer.idx_object_layer_above = layer_id;
if (m_slicing_params.soluble_interface) {
// Align the contact surface height with a layer immediately below the supported layer.
new_layer.print_z = layer.print_z - layer.height;
if (layer_id == 0) {
// This is a raft contact layer sitting directly on the print bed.
new_layer.height = m_slicing_params.contact_raft_layer_height;
new_layer.bottom_z = m_slicing_params.raft_interface_top_z;
} else {
// Interface layer will be synchronized with the object.
assert(layer_id > 0);
new_layer.height = object.layers[layer_id - 1]->height;
new_layer.bottom_z = (layer_id == 1) ? m_slicing_params.object_print_z_min : object.layers[layer_id - 2]->print_z;
}
} else {
// Contact layer will be printed with a normal flow, but
// it will support layers printed with a bridging flow.
//FIXME Probably printing with the bridge flow? How about the unsupported perimeters? Are they printed with the bridging flow?
// In the future we may switch to a normal extrusion flow for the supported bridges.
// Get the average nozzle diameter used on this layer.
coordf_t nozzle_dmr = 0.;
for (const LayerRegion *region : layer.regions)
nozzle_dmr += region->region()->nozzle_dmr_avg(*m_print_config);
nozzle_dmr /= coordf_t(layer.regions.size());
new_layer.print_z = layer.print_z - nozzle_dmr - m_object_config->support_material_contact_distance;
new_layer.bottom_z = new_layer.print_z;
new_layer.height = 0.;
if (layer_id == 0) {
// This is a raft contact layer sitting directly on the print bed.
assert(this->has_raft());
new_layer.bottom_z = m_slicing_params.raft_interface_top_z;
new_layer.height = m_slicing_params.contact_raft_layer_height;
} else {
// Ignore this contact area if it's too low.
// Don't want to print a layer below the first layer height as it may not stick well.
//FIXME there may be a need for a single layer support, then one may decide to print it either as a bottom contact or a top contact
// and it may actually make sense to do it with a thinner layer than the first layer height.
if (new_layer.print_z < m_slicing_params.first_print_layer_height - EPSILON) {
// This contact layer is below the first layer height, therefore not printable. Don't support this surface.
continue;
} else if (new_layer.print_z < m_slicing_params.first_print_layer_height + EPSILON) {
// Align the layer with the 1st layer height.
new_layer.print_z = m_slicing_params.first_print_layer_height;
new_layer.bottom_z = 0;
new_layer.height = m_slicing_params.first_print_layer_height;
} else {
// Don't know the height of the top contact layer yet. The top contact layer is printed with a normal flow and
// its height will be set adaptively later on.
}
}
}
SupportGridPattern support_grid_pattern(
// Support islands, to be stretched into a grid.
contact_polygons,
// Trimming polygons, to trim the stretched support islands.
slices_margin_cached,
// How much to offset the extracted contour outside of the grid.
m_object_config->support_material_spacing.value + m_support_material_flow.spacing(),
Geometry::deg2rad(m_object_config->support_material_angle.value));
// 1) infill polygons, expand them by half the extrusion width + a tiny bit of extra.
new_layer.polygons = support_grid_pattern.extract_support(m_support_material_flow.scaled_spacing()/2 + 5);
// 2) Contact polygons will be projected down. To keep the interface and base layers to grow, return a contour a tiny bit smaller than the grid cells.
new_layer.contact_polygons = new Polygons(support_grid_pattern.extract_support(-3));
// Even after the contact layer was expanded into a grid, some of the contact islands may be too tiny to be extruded.
// Remove those tiny islands from new_layer.polygons and new_layer.contact_polygons.
// Store the overhang polygons.
// The overhang polygons are used in the path generator for planning of the contact loops.
// if (this->has_contact_loops())
new_layer.overhang_polygons = new Polygons(std::move(overhang_polygons));
contact_out[layer_id] = &new_layer;
}
}
});
// Compress contact_out, remove the nullptr items.
remove_nulls(contact_out);
BOOST_LOG_TRIVIAL(debug) << "PrintObjectSupportMaterial::top_contact_layers() in parallel - end";
return contact_out;
}
// Generate bottom contact layers supporting the top contact layers.
// For a soluble interface material synchronize the layer heights with the object,
// otherwise set the layer height to a bridging flow of a support interface nozzle.
PrintObjectSupportMaterial::MyLayersPtr PrintObjectSupportMaterial::bottom_contact_layers_and_layer_support_areas(
const PrintObject &object, const MyLayersPtr &top_contacts, MyLayerStorage &layer_storage,
std::vector<Polygons> &layer_support_areas) const
{
#ifdef SLIC3R_DEBUG
static int iRun = 0;
++ iRun;
#endif /* SLIC3R_DEBUG */
// Allocate empty surface areas, one per object layer.
layer_support_areas.assign(object.total_layer_count(), Polygons());
// find object top surfaces
// we'll use them to clip our support and detect where does it stick
MyLayersPtr bottom_contacts;
if (! top_contacts.empty())
{
// There is some support to be built, if there are non-empty top surfaces detected.
// Sum of unsupported contact areas above the current layer.print_z.
Polygons projection;
// Last top contact layer visited when collecting the projection of contact areas.
int contact_idx = int(top_contacts.size()) - 1;
for (int layer_id = int(object.total_layer_count()) - 2; layer_id >= 0; -- layer_id) {
BOOST_LOG_TRIVIAL(trace) << "Support generator - bottom_contact_layers - layer " << layer_id;
const Layer &layer = *object.get_layer(layer_id);
// Collect projections of all contact areas above or at the same level as this top surface.
for (; contact_idx >= 0 && top_contacts[contact_idx]->print_z >= layer.print_z; -- contact_idx) {
Polygons polygons_new;
// Contact surfaces are expanded away from the object, trimmed by the object.
// Use a slight positive offset to overlap the touching regions.
#if 0
// Merge and collect the contact polygons. The contact polygons are inflated, but not extended into a grid form.
polygons_append(polygons_new, offset(*top_contacts[contact_idx]->contact_polygons, SCALED_EPSILON));
#else
// Consume the contact_polygons. The contact polygons are already expanded into a grid form.
polygons_append(polygons_new, std::move(*top_contacts[contact_idx]->contact_polygons));
#endif
// These are the overhang surfaces. They are touching the object and they are not expanded away from the object.
// Use a slight positive offset to overlap the touching regions.
polygons_append(polygons_new, offset(*top_contacts[contact_idx]->overhang_polygons, float(SCALED_EPSILON)));
polygons_append(projection, union_(polygons_new));
}
if (projection.empty())
continue;
Polygons projection_raw = union_(projection);
// Top surfaces of this layer, to be used to stop the surface volume from growing down.
tbb::task_group task_group;
if (! m_object_config->support_material_buildplate_only)
task_group.run([this, &object, &top_contacts, contact_idx, &layer, layer_id, &layer_storage, &layer_support_areas, &bottom_contacts, &projection_raw] {
Polygons top = collect_region_slices_by_type(layer, stTop);
#ifdef SLIC3R_DEBUG
{
BoundingBox bbox = get_extents(projection_raw);
bbox.merge(get_extents(top));
::Slic3r::SVG svg(debug_out_path("support-bottom-layers-raw-%d-%lf.svg", iRun, layer.print_z), bbox);
svg.draw(union_ex(top, false), "blue", 0.5f);
svg.draw(union_ex(projection_raw, true), "red", 0.5f);
svg.draw_outline(union_ex(projection_raw, true), "red", "blue", scale_(0.1f));
svg.draw(layer.slices.expolygons, "green", 0.5f);
}
#endif /* SLIC3R_DEBUG */
// Now find whether any projection of the contact surfaces above layer.print_z not yet supported by any
// top surfaces above layer.print_z falls onto this top surface.
// Touching are the contact surfaces supported exclusively by this top surfaces.
// Don't use a safety offset as it has been applied during insertion of polygons.
if (! top.empty()) {
Polygons touching = intersection(top, projection_raw, false);
if (! touching.empty()) {
// Allocate a new bottom contact layer.
MyLayer &layer_new = layer_allocate(layer_storage, sltBottomContact);
bottom_contacts.push_back(&layer_new);
// Grow top surfaces so that interface and support generation are generated
// with some spacing from object - it looks we don't need the actual
// top shapes so this can be done here
layer_new.height = m_slicing_params.soluble_interface ?
// Align the interface layer with the object's layer height.
object.layers[layer_id + 1]->height :
// Place a bridge flow interface layer over the top surface.
m_support_material_interface_flow.nozzle_diameter;
layer_new.print_z = m_slicing_params.soluble_interface ? object.layers[layer_id + 1]->print_z :
layer.print_z + layer_new.height + m_object_config->support_material_contact_distance.value;
layer_new.bottom_z = layer.print_z;
layer_new.idx_object_layer_below = layer_id;
layer_new.bridging = ! m_slicing_params.soluble_interface;
//FIXME how much to inflate the top surface?
layer_new.polygons = offset(touching, float(m_support_material_flow.scaled_width()), SUPPORT_SURFACES_OFFSET_PARAMETERS);
if (! m_slicing_params.soluble_interface) {
// Walk the top surfaces, snap the top of the new bottom surface to the closest top of the top surface,
// so there will be no support surfaces generated with thickness lower than m_support_layer_height_min.
for (size_t top_idx = size_t(std::max<int>(0, contact_idx));
top_idx < top_contacts.size() && top_contacts[top_idx]->print_z < layer_new.print_z + this->m_support_layer_height_min;
++ top_idx) {
if (top_contacts[top_idx]->print_z > layer_new.print_z - this->m_support_layer_height_min) {
// A top layer has been found, which is close to the new bottom layer.
coordf_t diff = layer_new.print_z - top_contacts[top_idx]->print_z;
assert(std::abs(diff) <= this->m_support_layer_height_min);
if (diff > 0.) {
// The top contact layer is below this layer. Make the bridging layer thinner to align with the existing top layer.
assert(diff < layer_new.height + EPSILON);
assert(layer_new.height - diff >= this->m_support_layer_height_min - EPSILON);
layer_new.print_z = top_contacts[top_idx]->print_z;
layer_new.height -= diff;
} else {
// The top contact layer is above this layer. One may either make this layer thicker or thinner.
// By making the layer thicker, one will decrease the number of discrete layers with the price of extruding a bit too thick bridges.
// By making the layer thinner, one adds one more discrete layer.
layer_new.print_z = top_contacts[top_idx]->print_z;
layer_new.height -= diff;
}
break;
}
}
}
#ifdef SLIC3R_DEBUG
Slic3r::SVG::export_expolygons(
debug_out_path("support-bottom-contacts-%d-%lf.svg", iRun, layer_new.print_z),
union_ex(layer_new.polygons, false));
#endif /* SLIC3R_DEBUG */
// Trim the already created base layers above the current layer intersecting with the new bottom contacts layer.
touching = offset(touching, float(SCALED_EPSILON));
for (int layer_id_above = layer_id + 1; layer_id_above < int(object.total_layer_count()); ++ layer_id_above) {
const Layer &layer_above = *object.layers[layer_id_above];
if (layer_above.print_z > layer_new.print_z + EPSILON)
break;
if (! layer_support_areas[layer_id_above].empty()) {
#ifdef SLIC3R_DEBUG
{
BoundingBox bbox = get_extents(touching);
bbox.merge(get_extents(layer_support_areas[layer_id_above]));
::Slic3r::SVG svg(debug_out_path("support-support-areas-raw-before-trimming-%d-with-%f-%lf.svg", iRun, layer.print_z, layer_above.print_z), bbox);
svg.draw(union_ex(touching, false), "blue", 0.5f);
svg.draw(union_ex(layer_support_areas[layer_id_above], true), "red", 0.5f);
svg.draw_outline(union_ex(layer_support_areas[layer_id_above], true), "red", "blue", scale_(0.1f));
}
#endif /* SLIC3R_DEBUG */
layer_support_areas[layer_id_above] = diff(layer_support_areas[layer_id_above], touching);
#ifdef SLIC3R_DEBUG
Slic3r::SVG::export_expolygons(
debug_out_path("support-support-areas-raw-after-trimming-%d-with-%f-%lf.svg", iRun, layer.print_z, layer_above.print_z),
union_ex(layer_support_areas[layer_id_above], false));
#endif /* SLIC3R_DEBUG */
}
}
}
} // ! top.empty()
});
Polygons &layer_support_area = layer_support_areas[layer_id];
task_group.run([this, &projection, &projection_raw, &layer, &layer_support_area, layer_id] {
// Remove the areas that touched from the projection that will continue on next, lower, top surfaces.
// Polygons trimming = union_(to_polygons(layer.slices.expolygons), touching, true);
Polygons trimming = offset(layer.slices.expolygons, float(SCALED_EPSILON));
projection = diff(projection_raw, trimming, false);
#ifdef SLIC3R_DEBUG
{
BoundingBox bbox = get_extents(projection_raw);
bbox.merge(get_extents(trimming));
::Slic3r::SVG svg(debug_out_path("support-support-areas-raw-%d-%lf.svg", iRun, layer.print_z), bbox);
svg.draw(union_ex(trimming, false), "blue", 0.5f);
svg.draw(union_ex(projection, true), "red", 0.5f);
svg.draw_outline(union_ex(projection, true), "red", "blue", scale_(0.1f));
}
#endif /* SLIC3R_DEBUG */
remove_sticks(projection);
remove_degenerate(projection);
#ifdef SLIC3R_DEBUG
Slic3r::SVG::export_expolygons(
debug_out_path("support-support-areas-raw-cleaned-%d-%lf.svg", iRun, layer.print_z),
union_ex(projection, false));
#endif /* SLIC3R_DEBUG */
SupportGridPattern support_grid_pattern(
// Support islands, to be stretched into a grid.
projection,
// Trimming polygons, to trim the stretched support islands.
trimming,
// How much to offset the extracted contour outside of the grid.
m_object_config->support_material_spacing.value + m_support_material_flow.spacing(),
Geometry::deg2rad(m_object_config->support_material_angle.value));
tbb::task_group task_group_inner;
// 1) Cache the slice of a support volume. The support volume is expanded by 1/2 of support material flow spacing
// to allow a placement of suppot zig-zag snake along the grid lines.
task_group_inner.run([this, &support_grid_pattern, &layer_support_area
#ifdef SLIC3R_DEBUG
, &layer
#endif /* SLIC3R_DEBUG */
] {
layer_support_area = support_grid_pattern.extract_support(m_support_material_flow.scaled_spacing()/2 + 25);
#ifdef SLIC3R_DEBUG
Slic3r::SVG::export_expolygons(
debug_out_path("support-layer_support_area-gridded-%d-%lf.svg", iRun, layer.print_z),
union_ex(layer_support_area, false));
#endif /* SLIC3R_DEBUG */
});
// 2) Support polygons will be projected down. To keep the interface and base layers from growing, return a contour a tiny bit smaller than the grid cells.
Polygons projection_new;
task_group_inner.run([&projection_new, &support_grid_pattern
#ifdef SLIC3R_DEBUG
, &layer
#endif /* SLIC3R_DEBUG */
] {
projection_new = support_grid_pattern.extract_support(-5);
#ifdef SLIC3R_DEBUG
Slic3r::SVG::export_expolygons(
debug_out_path("support-projection_new-gridded-%d-%lf.svg", iRun, layer.print_z),
union_ex(projection_new, false));
#endif /* SLIC3R_DEBUG */
});
task_group_inner.wait();
projection = std::move(projection_new);
});
task_group.wait();
}
std::reverse(bottom_contacts.begin(), bottom_contacts.end());
trim_support_layers_by_object(object, bottom_contacts, m_slicing_params.soluble_interface ? 0. : m_support_layer_height_min, 0., m_gap_xy);
} // ! top_contacts.empty()
return bottom_contacts;
}
// FN_HIGHER_EQUAL: the provided object pointer has a Z value >= of an internal threshold.
// Find the first item with Z value >= of an internal threshold of fn_higher_equal.
// If no vec item with Z value >= of an internal threshold of fn_higher_equal is found, return vec.size()
// If the initial idx is size_t(-1), then use binary search.
// Otherwise search linearly upwards.
template<typename T, typename FN_HIGHER_EQUAL>
size_t idx_higher_or_equal(const std::vector<T*> &vec, size_t idx, FN_HIGHER_EQUAL fn_higher_equal)
{
if (vec.empty()) {
idx = 0;
} else if (idx == size_t(-1)) {
// First of the batch of layers per thread pool invocation. Use binary search.
int idx_low = 0;
int idx_high = std::max(0, int(vec.size()) - 1);
while (idx_low + 1 < idx_high) {
int idx_mid = (idx_low + idx_high) / 2;
if (fn_higher_equal(vec[idx_mid]))
idx_high = idx_mid;
else
idx_low = idx_mid;
}
idx = fn_higher_equal(vec[idx_low]) ? idx_low :
(fn_higher_equal(vec[idx_high]) ? idx_high : vec.size());
} else {
// For the other layers of this batch of layers, search incrementally, which is cheaper than the binary search.
while (idx < vec.size() && ! fn_higher_equal(vec[idx]))
++ idx;
}
return idx;
}
// FN_LOWER_EQUAL: the provided object pointer has a Z value <= of an internal threshold.
// Find the first item with Z value <= of an internal threshold of fn_lower_equal.
// If no vec item with Z value <= of an internal threshold of fn_lower_equal is found, return -1.
// If the initial idx is < -1, then use binary search.
// Otherwise search linearly downwards.
template<typename T, typename FN_LOWER_EQUAL>
int idx_lower_or_equal(const std::vector<T*> &vec, int idx, FN_LOWER_EQUAL fn_lower_equal)
{
if (vec.empty()) {
idx = -1;
} else if (idx < -1) {
// First of the batch of layers per thread pool invocation. Use binary search.
int idx_low = 0;
int idx_high = std::max(0, int(vec.size()) - 1);
while (idx_low + 1 < idx_high) {
int idx_mid = (idx_low + idx_high) / 2;
if (fn_lower_equal(vec[idx_mid]))
idx_low = idx_mid;
else
idx_high = idx_mid;
}
idx = fn_lower_equal(vec[idx_high]) ? idx_high :
(fn_lower_equal(vec[idx_low ]) ? idx_low : -1);
} else {
// For the other layers of this batch of layers, search incrementally, which is cheaper than the binary search.
while (idx >= 0 && ! fn_lower_equal(vec[idx]))
-- idx;
}
return idx;
}
// Trim the top_contacts layers with the bottom_contacts layers if they overlap, so there would not be enough vertical space for both of them.
void PrintObjectSupportMaterial::trim_top_contacts_by_bottom_contacts(
const PrintObject &object, const MyLayersPtr &bottom_contacts, MyLayersPtr &top_contacts) const
{
tbb::parallel_for(tbb::blocked_range<int>(0, int(top_contacts.size())),
[this, &object, &bottom_contacts, &top_contacts](const tbb::blocked_range<int>& range) {
int idx_bottom_overlapping_first = -2;
// For all top contact layers, counting downwards due to the way idx_higher_or_equal caches the last index to avoid repeated binary search.
for (int idx_top = range.end() - 1; idx_top >= range.begin(); -- idx_top) {
MyLayer &layer_top = *top_contacts[idx_top];
// Find the first bottom layer overlapping with layer_top.
idx_bottom_overlapping_first = idx_lower_or_equal(bottom_contacts, idx_bottom_overlapping_first, [&layer_top](const MyLayer *layer_bottom){ return layer_bottom->bottom_print_z() - EPSILON <= layer_top.bottom_z; });
// For all top contact layers overlapping with the thick bottom contact layer:
for (int idx_bottom_overlapping = idx_bottom_overlapping_first; idx_bottom_overlapping >= 0; -- idx_bottom_overlapping) {
const MyLayer &layer_bottom = *bottom_contacts[idx_bottom_overlapping];
assert(layer_bottom.bottom_print_z() - EPSILON <= layer_top.bottom_z);
if (layer_top.print_z < layer_bottom.print_z + EPSILON) {
// Layers overlap. Trim layer_top with layer_bottom.
layer_top.polygons = diff(layer_top.polygons, layer_bottom.polygons);
} else
break;
}
}
});
}
PrintObjectSupportMaterial::MyLayersPtr PrintObjectSupportMaterial::raft_and_intermediate_support_layers(
const PrintObject &object,
const MyLayersPtr &bottom_contacts,
const MyLayersPtr &top_contacts,
MyLayerStorage &layer_storage) const
{
MyLayersPtr intermediate_layers;
// Collect and sort the extremes (bottoms of the top contacts and tops of the bottom contacts).
MyLayersPtr extremes;
extremes.reserve(top_contacts.size() + bottom_contacts.size());
for (size_t i = 0; i < top_contacts.size(); ++ i)
// Bottoms of the top contact layers. In case of non-soluble supports,
// the top contact layer thickness is not known yet.
extremes.push_back(top_contacts[i]);
for (size_t i = 0; i < bottom_contacts.size(); ++ i)
// Tops of the bottom contact layers.
extremes.push_back(bottom_contacts[i]);
if (extremes.empty())
return intermediate_layers;
auto layer_extreme_lower = [](const MyLayer *l1, const MyLayer *l2) {
coordf_t z1 = l1->extreme_z();
coordf_t z2 = l2->extreme_z();
// If the layers are aligned, return the top contact surface first.
return z1 < z2 || (z1 == z2 && l1->layer_type == PrintObjectSupportMaterial::sltTopContact && l2->layer_type == PrintObjectSupportMaterial::sltBottomContact);
};
std::sort(extremes.begin(), extremes.end(), layer_extreme_lower);
assert(extremes.empty() ||
(extremes.front()->extreme_z() > m_slicing_params.raft_interface_top_z - EPSILON &&
(m_slicing_params.raft_layers() == 1 || // only raft contact layer
extremes.front()->layer_type == sltTopContact || // first extreme is a top contact layer
extremes.front()->extreme_z() > m_slicing_params.first_print_layer_height - EPSILON)));
bool synchronize = this->synchronize_layers();
#ifdef _DEBUG
// Verify that the extremes are separated by m_support_layer_height_min.
for (size_t i = 1; i < extremes.size(); ++ i) {
assert(extremes[i]->extreme_z() - extremes[i-1]->extreme_z() == 0. ||
extremes[i]->extreme_z() - extremes[i-1]->extreme_z() > this->m_support_layer_height_min - EPSILON);
assert(extremes[i]->extreme_z() - extremes[i-1]->extreme_z() > 0. ||
extremes[i]->layer_type == extremes[i-1]->layer_type ||
(extremes[i]->layer_type == sltBottomContact && extremes[i - 1]->layer_type == sltTopContact));
}
#endif
// Generate intermediate layers.
// The first intermediate layer is the same as the 1st layer if there is no raft,
// or the bottom of the first intermediate layer is aligned with the bottom of the raft contact layer.
// Intermediate layers are always printed with a normal etrusion flow (non-bridging).
size_t idx_layer_object = 0;
for (size_t idx_extreme = 0; idx_extreme < extremes.size(); ++ idx_extreme) {
MyLayer *extr2 = extremes[idx_extreme];
coordf_t extr2z = extr2->extreme_z();
if (std::abs(extr2z - m_slicing_params.raft_interface_top_z) < EPSILON) {
// This is a raft contact layer, its height has been decided in this->top_contact_layers().
assert(extr2->layer_type == sltTopContact);
continue;
}
if (std::abs(extr2z - m_slicing_params.first_print_layer_height) < EPSILON) {
// This is a bottom of a synchronized (or soluble) top contact layer, its height has been decided in this->top_contact_layers().
assert(extr2->layer_type == sltTopContact);
assert(extr2->bottom_z == m_slicing_params.first_print_layer_height);
assert(extr2->print_z >= m_slicing_params.first_print_layer_height + this->m_support_layer_height_min - EPSILON);
if (intermediate_layers.empty() || intermediate_layers.back()->print_z < m_slicing_params.first_print_layer_height) {
MyLayer &layer_new = layer_allocate(layer_storage, sltIntermediate);
layer_new.bottom_z = 0.;
layer_new.print_z = m_slicing_params.first_print_layer_height;
layer_new.height = m_slicing_params.first_print_layer_height;
intermediate_layers.push_back(&layer_new);
}
continue;
}
assert(extr2z >= m_slicing_params.raft_interface_top_z + EPSILON);
assert(extr2z >= m_slicing_params.first_print_layer_height + EPSILON);
MyLayer *extr1 = (idx_extreme == 0) ? nullptr : extremes[idx_extreme - 1];
// Fuse a support layer firmly to the raft top interface (not to the raft contacts).
coordf_t extr1z = (extr1 == nullptr) ? m_slicing_params.raft_interface_top_z : extr1->extreme_z();
assert(extr2z >= extr1z);
assert(extr2z > extr1z || (extr1 != nullptr && extr2->layer_type == sltBottomContact));
if (std::abs(extr1z) < EPSILON) {
// This layer interval starts with the 1st layer. Print the 1st layer using the prescribed 1st layer thickness.
assert(! m_slicing_params.has_raft());
assert(intermediate_layers.empty() || intermediate_layers.back()->print_z <= m_slicing_params.first_print_layer_height);
// At this point only layers above first_print_layer_heigth + EPSILON are expected as the other cases were captured earlier.
assert(extr2z >= m_slicing_params.first_print_layer_height + EPSILON);
// Generate a new intermediate layer.
MyLayer &layer_new = layer_allocate(layer_storage, sltIntermediate);
layer_new.bottom_z = 0.;
layer_new.print_z = extr1z = m_slicing_params.first_print_layer_height;
layer_new.height = extr1z;
intermediate_layers.push_back(&layer_new);
// Continue printing the other layers up to extr2z.
}
coordf_t dist = extr2z - extr1z;
assert(dist >= 0.);
if (dist == 0.)
continue;
// The new layers shall be at least m_support_layer_height_min thick.
assert(dist >= m_support_layer_height_min - EPSILON);
if (synchronize) {
// Emit support layers synchronized with the object layers.
// Find the first object layer, which has its print_z in this support Z range.
while (idx_layer_object < object.layers.size() && object.layers[idx_layer_object]->print_z < extr1z + EPSILON)
++ idx_layer_object;
if (idx_layer_object == 0 && extr1z == m_slicing_params.raft_interface_top_z) {
// Insert one base support layer below the object.
MyLayer &layer_new = layer_allocate(layer_storage, sltIntermediate);
layer_new.print_z = m_slicing_params.object_print_z_min;
layer_new.bottom_z = m_slicing_params.raft_interface_top_z;
layer_new.height = layer_new.print_z - layer_new.bottom_z;
intermediate_layers.push_back(&layer_new);
}
// Emit all intermediate support layers synchronized with object layers up to extr2z.
for (; idx_layer_object < object.layers.size() && object.layers[idx_layer_object]->print_z < extr2z + EPSILON; ++ idx_layer_object) {
MyLayer &layer_new = layer_allocate(layer_storage, sltIntermediate);
layer_new.print_z = object.layers[idx_layer_object]->print_z;
layer_new.height = object.layers[idx_layer_object]->height;
layer_new.bottom_z = (idx_layer_object > 0) ? object.layers[idx_layer_object - 1]->print_z : (layer_new.print_z - layer_new.height);
assert(intermediate_layers.empty() || intermediate_layers.back()->print_z < layer_new.print_z + EPSILON);
intermediate_layers.push_back(&layer_new);
}
} else {
// Insert intermediate layers.
size_t n_layers_extra = size_t(ceil(dist / m_slicing_params.max_suport_layer_height));
assert(n_layers_extra > 0);
coordf_t step = dist / coordf_t(n_layers_extra);
if (extr1 != nullptr && extr1->layer_type == sltTopContact &&
extr1->print_z + this->m_support_layer_height_min > extr1->bottom_z + step) {
// The bottom extreme is a bottom of a top surface. Ensure that the gap
// between the 1st intermediate layer print_z and extr1->print_z is not too small.
assert(extr1->bottom_z + this->m_support_layer_height_min < extr1->print_z + EPSILON);
// Generate the first intermediate layer.
MyLayer &layer_new = layer_allocate(layer_storage, sltIntermediate);
layer_new.bottom_z = extr1->bottom_z;
layer_new.print_z = extr1z = extr1->print_z;
layer_new.height = extr1->height;
intermediate_layers.push_back(&layer_new);
dist = extr2z - extr1z;
n_layers_extra = size_t(ceil(dist / m_slicing_params.max_suport_layer_height));
if (n_layers_extra == 0)
continue;
// Continue printing the other layers up to extr2z.
step = dist / coordf_t(n_layers_extra);
}
if (! m_slicing_params.soluble_interface && extr2->layer_type == sltTopContact) {
// This is a top interface layer, which does not have a height assigned yet. Do it now.
assert(extr2->height == 0.);
assert(extr1z > m_slicing_params.first_print_layer_height - EPSILON);
extr2->height = step;
extr2->bottom_z = extr2z = extr2->print_z - step;
if (-- n_layers_extra == 0)
continue;
}
coordf_t extr2z_large_steps = extr2z;
// Take the largest allowed step in the Z axis until extr2z_large_steps is reached.
for (size_t i = 0; i < n_layers_extra; ++ i) {
MyLayer &layer_new = layer_allocate(layer_storage, sltIntermediate);
if (i + 1 == n_layers_extra) {
// Last intermediate layer added. Align the last entered layer with extr2z_large_steps exactly.
layer_new.bottom_z = (i == 0) ? extr1z : intermediate_layers.back()->print_z;
layer_new.print_z = extr2z_large_steps;
layer_new.height = layer_new.print_z - layer_new.bottom_z;
}
else {
// Intermediate layer, not the last added.
layer_new.height = step;
layer_new.bottom_z = extr1z + i * step;
layer_new.print_z = layer_new.bottom_z + step;
}
assert(intermediate_layers.empty() || intermediate_layers.back()->print_z <= layer_new.print_z);
intermediate_layers.push_back(&layer_new);
}
}
}
#ifdef _DEBUG
for (size_t i = 0; i < top_contacts.size(); ++i)
assert(top_contacts[i]->height > 0.);
#endif /* _DEBUG */
return intermediate_layers;
}
// At this stage there shall be intermediate_layers allocated between bottom_contacts and top_contacts, but they have no polygons assigned.
// Also the bottom/top_contacts shall have a layer thickness assigned already.
void PrintObjectSupportMaterial::generate_base_layers(
const PrintObject &object,
const MyLayersPtr &bottom_contacts,
const MyLayersPtr &top_contacts,
MyLayersPtr &intermediate_layers,
const std::vector<Polygons> &layer_support_areas) const
{
#ifdef SLIC3R_DEBUG
static int iRun = 0;
#endif /* SLIC3R_DEBUG */
if (top_contacts.empty())
// No top contacts -> no intermediate layers will be produced.
return;
// coordf_t fillet_radius_scaled = scale_(m_object_config->support_material_spacing);
BOOST_LOG_TRIVIAL(debug) << "PrintObjectSupportMaterial::generate_base_layers() in parallel - start";
tbb::parallel_for(
tbb::blocked_range<size_t>(0, intermediate_layers.size()),
[this, &object, &bottom_contacts, &top_contacts, &intermediate_layers, &layer_support_areas](const tbb::blocked_range<size_t>& range) {
// index -2 means not initialized yet, -1 means intialized and decremented to 0 and then -1.
int idx_top_contact_above = -2;
int idx_bottom_contact_overlapping = -2;
int idx_object_layer_above = -2;
// Counting down due to the way idx_lower_or_equal caches indices to avoid repeated binary search over the complete sequence.
for (int idx_intermediate = int(range.end()) - 1; idx_intermediate >= int(range.begin()); -- idx_intermediate)
{
BOOST_LOG_TRIVIAL(trace) << "Support generator - generate_base_layers - creating layer " <<
idx_intermediate << " of " << intermediate_layers.size();
MyLayer &layer_intermediate = *intermediate_layers[idx_intermediate];
// Layers must be sorted by print_z.
assert(idx_intermediate == 0 || layer_intermediate.print_z >= intermediate_layers[idx_intermediate - 1]->print_z);
// Find a top_contact layer touching the layer_intermediate from above, if any, and collect its polygons into polygons_new.
idx_top_contact_above = idx_lower_or_equal(top_contacts, idx_top_contact_above,
[&layer_intermediate](const MyLayer *layer){ return layer->bottom_z <= layer_intermediate.print_z - EPSILON; });
// New polygons for layer_intermediate.
Polygons polygons_new;
// Use the precomputed layer_support_areas.
idx_object_layer_above = std::max(0, idx_lower_or_equal(object.layers, idx_object_layer_above,
[&layer_intermediate](const Layer *layer){ return layer->print_z <= layer_intermediate.print_z + EPSILON; }));
polygons_new = layer_support_areas[idx_object_layer_above];
// Polygons to trim polygons_new.
Polygons polygons_trimming;
// Trimming the base layer with any overlapping top layer.
// Following cases are recognized:
// 1) top.bottom_z >= base.top_z -> No overlap, no trimming needed.
// 2) base.bottom_z >= top.print_z -> No overlap, no trimming needed.
// 3) base.print_z > top.print_z && base.bottom_z >= top.bottom_z -> Overlap, which will be solved inside generate_toolpaths() by reducing the base layer height where it overlaps the top layer. No trimming needed here.
// 4) base.print_z > top.bottom_z && base.bottom_z < top.bottom_z -> Base overlaps with top.bottom_z. This must not happen.
// 5) base.print_z <= top.print_z && base.bottom_z >= top.bottom_z -> Base is fully inside top. Trim base by top.
int idx_top_contact_overlapping = idx_top_contact_above;
while (idx_top_contact_overlapping >= 0 &&
top_contacts[idx_top_contact_overlapping]->bottom_z > layer_intermediate.print_z - EPSILON)
-- idx_top_contact_overlapping;
// Collect all the top_contact layer intersecting with this layer.
for (; idx_top_contact_overlapping >= 0; -- idx_top_contact_overlapping) {
MyLayer &layer_top_overlapping = *top_contacts[idx_top_contact_overlapping];
if (layer_top_overlapping.print_z < layer_intermediate.bottom_z + EPSILON)
break;
// Base must not overlap with top.bottom_z.
assert(! (layer_intermediate.print_z > layer_top_overlapping.bottom_z + EPSILON && layer_intermediate.bottom_z < layer_top_overlapping.bottom_z - EPSILON));
if (layer_intermediate.print_z <= layer_top_overlapping.print_z + EPSILON && layer_intermediate.bottom_z >= layer_top_overlapping.bottom_z - EPSILON)
// Base is fully inside top. Trim base by top.
polygons_append(polygons_trimming, layer_top_overlapping.polygons);
}
// Trimming the base layer with any overlapping bottom layer.
// Following cases are recognized:
// 1) bottom.bottom_z >= base.top_z -> No overlap, no trimming needed.
// 2) base.bottom_z >= bottom.print_z -> No overlap, no trimming needed.
// 3) base.print_z > bottom.bottom_z && base.bottom_z < bottom.bottom_z -> Overlap, which will be solved inside generate_toolpaths() by reducing the bottom layer height where it overlaps the base layer. No trimming needed here.
// 4) base.print_z > bottom.print_z && base.bottom_z >= bottom.print_z -> Base overlaps with bottom.print_z. This must not happen.
// 5) base.print_z <= bottom.print_z && base.bottom_z >= bottom.bottom_z -> Base is fully inside top. Trim base by top.
idx_bottom_contact_overlapping = idx_lower_or_equal(bottom_contacts, idx_bottom_contact_overlapping,
[&layer_intermediate](const MyLayer *layer){ return layer->bottom_print_z() <= layer_intermediate.print_z - EPSILON; });
// Collect all the bottom_contacts layer intersecting with this layer.
for (int i = idx_bottom_contact_overlapping; i >= 0; -- i) {
MyLayer &layer_bottom_overlapping = *bottom_contacts[i];
if (layer_bottom_overlapping.print_z < layer_intermediate.bottom_print_z() + EPSILON)
break;
// Base must not overlap with bottom.top_z.
assert(! (layer_intermediate.print_z > layer_bottom_overlapping.print_z + EPSILON && layer_intermediate.bottom_z < layer_bottom_overlapping.print_z - EPSILON));
if (layer_intermediate.print_z <= layer_bottom_overlapping.print_z + EPSILON && layer_intermediate.bottom_z >= layer_bottom_overlapping.bottom_print_z() - EPSILON)
// Base is fully inside bottom. Trim base by bottom.
polygons_append(polygons_trimming, layer_bottom_overlapping.polygons);
}
#ifdef SLIC3R_DEBUG
{
BoundingBox bbox = get_extents(polygons_new);
bbox.merge(get_extents(polygons_trimming));
::Slic3r::SVG svg(debug_out_path("support-intermediate-layers-raw-%d-%lf.svg", iRun, layer_intermediate.print_z), bbox);
svg.draw(union_ex(polygons_new, false), "blue", 0.5f);
svg.draw(to_polylines(polygons_new), "blue");
svg.draw(union_ex(polygons_trimming, true), "red", 0.5f);
svg.draw(to_polylines(polygons_trimming), "red");
}
#endif /* SLIC3R_DEBUG */
// Trim the polygons, store them.
if (polygons_trimming.empty())
layer_intermediate.polygons = std::move(polygons_new);
else
layer_intermediate.polygons = diff(
polygons_new,
polygons_trimming,
true); // safety offset to merge the touching source polygons
layer_intermediate.layer_type = sltBase;
#if 0
// Fillet the base polygons and trim them again with the top, interface and contact layers.
$base->{$i} = diff(
offset2(
$base->{$i},
$fillet_radius_scaled,
-$fillet_radius_scaled,
# Use a geometric offsetting for filleting.
JT_ROUND,
0.2*$fillet_radius_scaled),
$trim_polygons,
false); // don't apply the safety offset.
}
#endif
}
});
BOOST_LOG_TRIVIAL(debug) << "PrintObjectSupportMaterial::generate_base_layers() in parallel - end";
#ifdef SLIC3R_DEBUG
for (MyLayersPtr::const_iterator it = intermediate_layers.begin(); it != intermediate_layers.end(); ++it)
::Slic3r::SVG::export_expolygons(
debug_out_path("support-intermediate-layers-untrimmed-%d-%lf.svg", iRun, (*it)->print_z),
union_ex((*it)->polygons, false));
++ iRun;
#endif /* SLIC3R_DEBUG */
trim_support_layers_by_object(object, intermediate_layers, m_slicing_params.soluble_interface ? 0. : m_support_layer_height_min, m_slicing_params.soluble_interface ? 0. : m_support_layer_height_min, m_gap_xy);
}
void PrintObjectSupportMaterial::trim_support_layers_by_object(
const PrintObject &object,
MyLayersPtr &support_layers,
const coordf_t gap_extra_above,
const coordf_t gap_extra_below,
const coordf_t gap_xy) const
{
const float gap_xy_scaled = float(scale_(gap_xy));
// Collect non-empty layers to be processed in parallel.
// This is a good idea as pulling a thread from a thread pool for an empty task is expensive.
MyLayersPtr nonempty_layers;
nonempty_layers.reserve(support_layers.size());
for (size_t idx_layer = 0; idx_layer < support_layers.size(); ++ idx_layer) {
MyLayer *support_layer = support_layers[idx_layer];
if (! support_layer->polygons.empty() && support_layer->print_z >= m_slicing_params.raft_contact_top_z + EPSILON)
// Non-empty support layer and not a raft layer.
nonempty_layers.push_back(support_layer);
}
// For all intermediate support layers:
BOOST_LOG_TRIVIAL(debug) << "PrintObjectSupportMaterial::trim_support_layers_by_object() in parallel - start";
tbb::parallel_for(
tbb::blocked_range<size_t>(0, nonempty_layers.size()),
[this, &object, &nonempty_layers, gap_extra_above, gap_extra_below, gap_xy_scaled](const tbb::blocked_range<size_t>& range) {
size_t idx_object_layer_overlapping = size_t(-1);
for (size_t idx_layer = range.begin(); idx_layer < range.end(); ++ idx_layer) {
MyLayer &support_layer = *nonempty_layers[idx_layer];
// BOOST_LOG_TRIVIAL(trace) << "Support generator - trim_support_layers_by_object - trimmming non-empty layer " << idx_layer << " of " << nonempty_layers.size();
assert(! support_layer.polygons.empty() && support_layer.print_z >= m_slicing_params.raft_contact_top_z + EPSILON);
// Find the overlapping object layers including the extra above / below gap.
coordf_t z_threshold = support_layer.print_z - support_layer.height - gap_extra_below + EPSILON;
idx_object_layer_overlapping = idx_higher_or_equal(
object.layers, idx_object_layer_overlapping,
[z_threshold](const Layer *layer){ return layer->print_z >= z_threshold; });
// Collect all the object layers intersecting with this layer.
Polygons polygons_trimming;
size_t i = idx_object_layer_overlapping;
for (; i < object.layers.size(); ++ i) {
const Layer &object_layer = *object.layers[i];
if (object_layer.print_z - object_layer.height > support_layer.print_z + gap_extra_above - EPSILON)
break;
polygons_append(polygons_trimming, (Polygons)object_layer.slices);
}
if (! this->m_slicing_params.soluble_interface) {
// Collect all bottom surfaces, which will be extruded with a bridging flow.
for (; i < object.layers.size(); ++ i) {
const Layer &object_layer = *object.layers[i];
bool some_region_overlaps = false;
for (LayerRegion* region : object_layer.regions) {
coordf_t nozzle_dmr = region->region()->nozzle_dmr_avg(*this->m_print_config);
if (object_layer.print_z - nozzle_dmr > support_layer.print_z + gap_extra_above - EPSILON)
break;
some_region_overlaps = true;
polygons_append(polygons_trimming, to_polygons(region->slices.filter_by_type(stBottomBridge)));
}
if (! some_region_overlaps)
break;
}
}
// $layer->slices contains the full shape of layer, thus including
// perimeter's width. $support contains the full shape of support
// material, thus including the width of its foremost extrusion.
// We leave a gap equal to a full extrusion width.
support_layer.polygons = diff(
support_layer.polygons,
offset(polygons_trimming, gap_xy_scaled, SUPPORT_SURFACES_OFFSET_PARAMETERS));
}
});
BOOST_LOG_TRIVIAL(debug) << "PrintObjectSupportMaterial::trim_support_layers_by_object() in parallel - end";
}
PrintObjectSupportMaterial::MyLayersPtr PrintObjectSupportMaterial::generate_raft_base(
const MyLayersPtr &top_contacts,
const MyLayersPtr &interface_layers,
const MyLayersPtr &base_layers,
MyLayerStorage &layer_storage) const
{
// How much to inflate the support columns to be stable. This also applies to the 1st layer, if no raft layers are to be printed.
const float inflate_factor_fine = float(scale_((m_slicing_params.raft_layers() > 1) ? 0.5 : EPSILON));
const float inflate_factor_1st_layer = float(scale_(3.)) - inflate_factor_fine;
MyLayer *contacts = top_contacts .empty() ? nullptr : top_contacts .front();
MyLayer *interfaces = interface_layers.empty() ? nullptr : interface_layers.front();
MyLayer *columns_base = base_layers .empty() ? nullptr : base_layers .front();
if (contacts != nullptr && contacts->print_z > std::max(m_slicing_params.first_print_layer_height, m_slicing_params.raft_contact_top_z) + EPSILON)
// This is not the raft contact layer.
contacts = nullptr;
if (interfaces != nullptr && interfaces->bottom_print_z() > m_slicing_params.raft_interface_top_z + EPSILON)
// This is not the raft column base layer.
interfaces = nullptr;
if (columns_base != nullptr && columns_base->bottom_print_z() > m_slicing_params.raft_interface_top_z + EPSILON)
// This is not the raft interface layer.
columns_base = nullptr;
Polygons interface_polygons;
if (contacts != nullptr && ! contacts->polygons.empty())
polygons_append(interface_polygons, offset(contacts->polygons, inflate_factor_fine, SUPPORT_SURFACES_OFFSET_PARAMETERS));
if (interfaces != nullptr && ! interfaces->polygons.empty())
polygons_append(interface_polygons, offset(interfaces->polygons, inflate_factor_fine, SUPPORT_SURFACES_OFFSET_PARAMETERS));
// Output vector.
MyLayersPtr raft_layers;
if (m_slicing_params.raft_layers() > 1) {
Polygons base;
Polygons columns;
if (columns_base != nullptr) {
base = columns_base->polygons;
columns = base;
if (! interface_polygons.empty())
// Trim the 1st layer columns with the inflated interface polygons.
columns = diff(columns, interface_polygons);
}
if (! interface_polygons.empty()) {
// Merge the untrimmed columns base with the expanded raft interface, to be used for the support base and interface.
base = union_(base, interface_polygons);
}
// Do not add the raft contact layer, only add the raft layers below the contact layer.
// Insert the 1st layer.
{
MyLayer &new_layer = layer_allocate(layer_storage, (m_slicing_params.base_raft_layers > 0) ? sltRaftBase : sltRaftInterface);
raft_layers.push_back(&new_layer);
new_layer.print_z = m_slicing_params.first_print_layer_height;
new_layer.height = m_slicing_params.first_print_layer_height;
new_layer.bottom_z = 0.;
new_layer.polygons = offset(base, inflate_factor_1st_layer);
}
// Insert the base layers.
for (size_t i = 1; i < m_slicing_params.base_raft_layers; ++ i) {
coordf_t print_z = raft_layers.back()->print_z;
MyLayer &new_layer = layer_allocate(layer_storage, sltRaftBase);
raft_layers.push_back(&new_layer);
new_layer.print_z = print_z + m_slicing_params.base_raft_layer_height;
new_layer.height = m_slicing_params.base_raft_layer_height;
new_layer.bottom_z = print_z;
new_layer.polygons = base;
}
// Insert the interface layers.
for (size_t i = 1; i < m_slicing_params.interface_raft_layers; ++ i) {
coordf_t print_z = raft_layers.back()->print_z;
MyLayer &new_layer = layer_allocate(layer_storage, sltRaftInterface);
raft_layers.push_back(&new_layer);
new_layer.print_z = print_z + m_slicing_params.interface_raft_layer_height;
new_layer.height = m_slicing_params.interface_raft_layer_height;
new_layer.bottom_z = print_z;
new_layer.polygons = interface_polygons;
//FIXME misusing contact_polygons for support columns.
new_layer.contact_polygons = new Polygons(columns);
}
} else if (columns_base != nullptr) {
// Expand the bases of the support columns in the 1st layer.
columns_base->polygons = diff(
offset(columns_base->polygons, inflate_factor_1st_layer),
offset(m_object->layers.front()->slices.expolygons, scale_(m_gap_xy), SUPPORT_SURFACES_OFFSET_PARAMETERS));
if (contacts != nullptr)
columns_base->polygons = diff(columns_base->polygons, interface_polygons);
}
return raft_layers;
}
// Convert some of the intermediate layers into top/bottom interface layers.
PrintObjectSupportMaterial::MyLayersPtr PrintObjectSupportMaterial::generate_interface_layers(
const MyLayersPtr &bottom_contacts,
const MyLayersPtr &top_contacts,
MyLayersPtr &intermediate_layers,
MyLayerStorage &layer_storage) const
{
// my $area_threshold = $self->interface_flow->scaled_spacing ** 2;
MyLayersPtr interface_layers;
// Contact layer is considered an interface layer, therefore run the following block only if support_material_interface_layers > 1.
if (! intermediate_layers.empty() && m_object_config->support_material_interface_layers.value > 1) {
// For all intermediate layers, collect top contact surfaces, which are not further than support_material_interface_layers.
BOOST_LOG_TRIVIAL(debug) << "PrintObjectSupportMaterial::generate_interface_layers() in parallel - start";
interface_layers.assign(intermediate_layers.size(), nullptr);
tbb::spin_mutex layer_storage_mutex;
tbb::parallel_for(tbb::blocked_range<size_t>(0, intermediate_layers.size()),
[this, &bottom_contacts, &top_contacts, &intermediate_layers, &layer_storage, &layer_storage_mutex, &interface_layers](const tbb::blocked_range<size_t>& range) {
// Index of the first top contact layer intersecting the current intermediate layer.
size_t idx_top_contact_first = size_t(-1);
// Index of the first bottom contact layer intersecting the current intermediate layer.
size_t idx_bottom_contact_first = size_t(-1);
for (size_t idx_intermediate_layer = range.begin(); idx_intermediate_layer < range.end(); ++ idx_intermediate_layer) {
MyLayer &intermediate_layer = *intermediate_layers[idx_intermediate_layer];
// Top / bottom Z coordinate of a slab, over which we are collecting the top / bottom contact surfaces.
coordf_t top_z = intermediate_layers[std::min<int>(intermediate_layers.size()-1, idx_intermediate_layer + m_object_config->support_material_interface_layers - 1)]->print_z;
coordf_t bottom_z = intermediate_layers[std::max<int>(0, int(idx_intermediate_layer) - int(m_object_config->support_material_interface_layers) + 1)]->bottom_z;
// Move idx_top_contact_first up until above the current print_z.
idx_top_contact_first = idx_higher_or_equal(top_contacts, idx_top_contact_first, [&intermediate_layer](const MyLayer *layer){ return layer->print_z >= intermediate_layer.print_z; });
// Collect the top contact areas above this intermediate layer, below top_z.
Polygons polygons_top_contact_projected;
for (size_t idx_top_contact = idx_top_contact_first; idx_top_contact < top_contacts.size(); ++ idx_top_contact) {
const MyLayer &top_contact_layer = *top_contacts[idx_top_contact];
if (top_contact_layer.bottom_z - EPSILON > top_z)
break;
polygons_append(polygons_top_contact_projected, top_contact_layer.polygons);
}
// Move idx_bottom_contact_first up until touching bottom_z.
idx_bottom_contact_first = idx_higher_or_equal(bottom_contacts, idx_bottom_contact_first, [bottom_z](const MyLayer *layer){ return layer->print_z >= bottom_z - EPSILON; });
// Collect the top contact areas above this intermediate layer, below top_z.
Polygons polygons_bottom_contact_projected;
for (size_t idx_bottom_contact = idx_bottom_contact_first; idx_bottom_contact < bottom_contacts.size(); ++ idx_bottom_contact) {
const MyLayer &bottom_contact_layer = *bottom_contacts[idx_bottom_contact];
if (bottom_contact_layer.print_z - EPSILON > intermediate_layer.bottom_z)
break;
polygons_append(polygons_bottom_contact_projected, bottom_contact_layer.polygons);
}
if (polygons_top_contact_projected.empty() && polygons_bottom_contact_projected.empty())
continue;
// Insert a new layer into top_interface_layers.
MyLayer &layer_new = layer_allocate(layer_storage, layer_storage_mutex,
polygons_top_contact_projected.empty() ? sltBottomInterface : sltTopInterface);
layer_new.print_z = intermediate_layer.print_z;
layer_new.bottom_z = intermediate_layer.bottom_z;
layer_new.height = intermediate_layer.height;
layer_new.bridging = intermediate_layer.bridging;
interface_layers[idx_intermediate_layer] = &layer_new;
polygons_append(polygons_top_contact_projected, polygons_bottom_contact_projected);
polygons_top_contact_projected = union_(polygons_top_contact_projected, true);
layer_new.polygons = intersection(intermediate_layer.polygons, polygons_top_contact_projected);
//FIXME filter layer_new.polygons islands by a minimum area?
// $interface_area = [ grep abs($_->area) >= $area_threshold, @$interface_area ];
intermediate_layer.polygons = diff(intermediate_layer.polygons, polygons_top_contact_projected, false);
}
});
// Compress contact_out, remove the nullptr items.
remove_nulls(interface_layers);
BOOST_LOG_TRIVIAL(debug) << "PrintObjectSupportMaterial::generate_interface_layers() in parallel - start";
}
return interface_layers;
}
static inline void fill_expolygons_generate_paths(
ExtrusionEntitiesPtr &dst,
const ExPolygons &expolygons,
Fill *filler,
float density,
ExtrusionRole role,
const Flow &flow)
{
FillParams fill_params;
fill_params.density = density;
fill_params.complete = true;
fill_params.dont_adjust = true;
for (ExPolygons::const_iterator it_expolygon = expolygons.begin(); it_expolygon != expolygons.end(); ++ it_expolygon) {
Surface surface(stInternal, *it_expolygon);
extrusion_entities_append_paths(
dst,
filler->fill_surface(&surface, fill_params),
role,
flow.mm3_per_mm(), flow.width, flow.height);
}
}
static inline void fill_expolygons_generate_paths(
ExtrusionEntitiesPtr &dst,
ExPolygons &&expolygons,
Fill *filler,
float density,
ExtrusionRole role,
const Flow &flow)
{
FillParams fill_params;
fill_params.density = density;
fill_params.complete = true;
fill_params.dont_adjust = true;
for (ExPolygons::iterator it_expolygon = expolygons.begin(); it_expolygon != expolygons.end(); ++ it_expolygon) {
Surface surface(stInternal, std::move(*it_expolygon));
extrusion_entities_append_paths(
dst,
filler->fill_surface(&surface, fill_params),
role,
flow.mm3_per_mm(), flow.width, flow.height);
}
}
// Support layers, partially processed.
struct MyLayerExtruded
{
MyLayerExtruded() : layer(nullptr), m_polygons_to_extrude(nullptr) {}
~MyLayerExtruded() { delete m_polygons_to_extrude; m_polygons_to_extrude = nullptr; }
bool empty() const {
return layer == nullptr || layer->polygons.empty();
}
void set_polygons_to_extrude(Polygons &&polygons) {
if (m_polygons_to_extrude == nullptr)
m_polygons_to_extrude = new Polygons(std::move(polygons));
else
*m_polygons_to_extrude = std::move(polygons);
}
Polygons& polygons_to_extrude() { return (this->m_polygons_to_extrude == nullptr) ? layer->polygons : *this->m_polygons_to_extrude; }
const Polygons& polygons_to_extrude() const { return (this->m_polygons_to_extrude == nullptr) ? layer->polygons : *this->m_polygons_to_extrude; }
bool could_merge(const MyLayerExtruded &other) const {
return ! this->empty() && ! other.empty() &&
std::abs(this->layer->height - other.layer->height) < EPSILON &&
this->layer->bridging == other.layer->bridging;
}
// Merge regions, perform boolean union over the merged polygons.
void merge(MyLayerExtruded &&other) {
assert(this->could_merge(other));
// 1) Merge the rest polygons to extrude, if there are any.
if (other.m_polygons_to_extrude != nullptr) {
if (this->m_polygons_to_extrude == nullptr) {
// This layer has no extrusions generated yet, if it has no m_polygons_to_extrude (its area to extrude was not reduced yet).
assert(this->extrusions.empty());
this->m_polygons_to_extrude = new Polygons(this->layer->polygons);
}
Slic3r::polygons_append(*this->m_polygons_to_extrude, std::move(*other.m_polygons_to_extrude));
*this->m_polygons_to_extrude = union_(*this->m_polygons_to_extrude, true);
delete other.m_polygons_to_extrude;
other.m_polygons_to_extrude = nullptr;
} else if (this->m_polygons_to_extrude != nullptr) {
assert(other.m_polygons_to_extrude == nullptr);
// The other layer has no extrusions generated yet, if it has no m_polygons_to_extrude (its area to extrude was not reduced yet).
assert(other.extrusions.empty());
Slic3r::polygons_append(*this->m_polygons_to_extrude, other.layer->polygons);
*this->m_polygons_to_extrude = union_(*this->m_polygons_to_extrude, true);
}
// 2) Merge the extrusions.
this->extrusions.insert(this->extrusions.end(), other.extrusions.begin(), other.extrusions.end());
other.extrusions.clear();
// 3) Merge the infill polygons.
Slic3r::polygons_append(this->layer->polygons, std::move(other.layer->polygons));
this->layer->polygons = union_(this->layer->polygons, true);
other.layer->polygons.clear();
}
void polygons_append(Polygons &dst) const {
if (layer != NULL && ! layer->polygons.empty())
Slic3r::polygons_append(dst, layer->polygons);
}
// The source layer. It carries the height and extrusion type (bridging / non bridging, extrusion height).
PrintObjectSupportMaterial::MyLayer *layer;
// Collect extrusions. They will be exported sorted by the bottom height.
ExtrusionEntitiesPtr extrusions;
// In case the extrusions are non-empty, m_polygons_to_extrude may contain the rest areas yet to be filled by additional support.
// This is useful mainly for the loop interfaces, which are generated before the zig-zag infills.
Polygons *m_polygons_to_extrude;
};
typedef std::vector<MyLayerExtruded*> MyLayerExtrudedPtrs;
struct LoopInterfaceProcessor
{
LoopInterfaceProcessor(coordf_t circle_r) :
n_contact_loops(0),
circle_radius(circle_r),
circle_distance(circle_r * 3.)
{
// Shape of the top contact area.
circle.points.reserve(6);
for (size_t i = 0; i < 6; ++ i) {
double angle = double(i) * M_PI / 3.;
circle.points.push_back(Point(circle_radius * cos(angle), circle_radius * sin(angle)));
}
}
// Generate loop contacts at the top_contact_layer,
// trim the top_contact_layer->polygons with the areas covered by the loops.
void generate(MyLayerExtruded &top_contact_layer, const Flow &interface_flow_src) const;
int n_contact_loops;
coordf_t circle_radius;
coordf_t circle_distance;
Polygon circle;
};
void LoopInterfaceProcessor::generate(MyLayerExtruded &top_contact_layer, const Flow &interface_flow_src) const
{
if (n_contact_loops == 0 || top_contact_layer.empty())
return;
Flow flow = interface_flow_src;
flow.height = float(top_contact_layer.layer->height);
Polygons overhang_polygons;
if (top_contact_layer.layer->overhang_polygons != nullptr)
overhang_polygons = std::move(*top_contact_layer.layer->overhang_polygons);
// Generate the outermost loop.
// Find centerline of the external loop (or any other kind of extrusions should the loop be skipped)
ExPolygons top_contact_expolygons = offset_ex(union_ex(top_contact_layer.layer->polygons), - 0.5f * flow.scaled_width());
// Grid size and bit shifts for quick and exact to/from grid coordinates manipulation.
coord_t circle_grid_resolution = 1;
coord_t circle_grid_powerof2 = 0;
{
// epsilon to account for rounding errors
coord_t circle_grid_resolution_non_powerof2 = coord_t(2. * circle_distance + 3.);
while (circle_grid_resolution < circle_grid_resolution_non_powerof2) {
circle_grid_resolution <<= 1;
++ circle_grid_powerof2;
}
}
struct PointAccessor {
const Point* operator()(const Point &pt) const { return &pt; }
};
typedef ClosestPointInRadiusLookup<Point, PointAccessor> ClosestPointLookupType;
Polygons loops0;
{
// find centerline of the external loop of the contours
// Only consider the loops facing the overhang.
Polygons external_loops;
// Holes in the external loops.
Polygons circles;
Polygons overhang_with_margin = offset(union_ex(overhang_polygons), 0.5f * flow.scaled_width());
for (ExPolygons::iterator it_contact_expoly = top_contact_expolygons.begin(); it_contact_expoly != top_contact_expolygons.end(); ++ it_contact_expoly) {
// Store the circle centers placed for an expolygon into a regular grid, hashed by the circle centers.
ClosestPointLookupType circle_centers_lookup(coord_t(circle_distance - SCALED_EPSILON));
Points circle_centers;
Point center_last;
// For each contour of the expolygon, start with the outer contour, continue with the holes.
for (size_t i_contour = 0; i_contour <= it_contact_expoly->holes.size(); ++ i_contour) {
Polygon &contour = (i_contour == 0) ? it_contact_expoly->contour : it_contact_expoly->holes[i_contour - 1];
const Point *seg_current_pt = nullptr;
coordf_t seg_current_t = 0.;
if (! intersection_pl(contour.split_at_first_point(), overhang_with_margin).empty()) {
// The contour is below the overhang at least to some extent.
//FIXME ideally one would place the circles below the overhang only.
// Walk around the contour and place circles so their centers are not closer than circle_distance from each other.
if (circle_centers.empty()) {
// Place the first circle.
seg_current_pt = &contour.points.front();
seg_current_t = 0.;
center_last = *seg_current_pt;
circle_centers_lookup.insert(center_last);
circle_centers.push_back(center_last);
}
for (Points::const_iterator it = contour.points.begin() + 1; it != contour.points.end(); ++it) {
// Is it possible to place a circle on this segment? Is it not too close to any of the circles already placed on this contour?
const Point &p1 = *(it-1);
const Point &p2 = *it;
// Intersection of a ray (p1, p2) with a circle placed at center_last, with radius of circle_distance.
const Pointf v_seg(coordf_t(p2.x) - coordf_t(p1.x), coordf_t(p2.y) - coordf_t(p1.y));
const Pointf v_cntr(coordf_t(p1.x - center_last.x), coordf_t(p1.y - center_last.y));
coordf_t a = dot(v_seg);
coordf_t b = 2. * dot(v_seg, v_cntr);
coordf_t c = dot(v_cntr) - circle_distance * circle_distance;
coordf_t disc = b * b - 4. * a * c;
if (disc > 0.) {
// The circle intersects a ray. Avoid the parts of the segment inside the circle.
coordf_t t1 = (-b - sqrt(disc)) / (2. * a);
coordf_t t2 = (-b + sqrt(disc)) / (2. * a);
coordf_t t0 = (seg_current_pt == &p1) ? seg_current_t : 0.;
// Take the lowest t in <t0, 1.>, excluding <t1, t2>.
coordf_t t;
if (t0 <= t1)
t = t0;
else if (t2 <= 1.)
t = t2;
else {
// Try the following segment.
seg_current_pt = nullptr;
continue;
}
seg_current_pt = &p1;
seg_current_t = t;
center_last = Point(p1.x + coord_t(v_seg.x * t), p1.y + coord_t(v_seg.y * t));
// It has been verified that the new point is far enough from center_last.
// Ensure, that it is far enough from all the centers.
std::pair<const Point*, coordf_t> circle_closest = circle_centers_lookup.find(center_last);
if (circle_closest.first != nullptr) {
-- it;
continue;
}
} else {
// All of the segment is outside the circle. Take the first point.
seg_current_pt = &p1;
seg_current_t = 0.;
center_last = p1;
}
// Place the first circle.
circle_centers_lookup.insert(center_last);
circle_centers.push_back(center_last);
}
external_loops.push_back(std::move(contour));
for (Points::const_iterator it_center = circle_centers.begin(); it_center != circle_centers.end(); ++ it_center) {
circles.push_back(circle);
circles.back().translate(*it_center);
}
}
}
}
// Apply a pattern to the external loops.
loops0 = diff(external_loops, circles);
}
Polylines loop_lines;
{
// make more loops
Polygons loop_polygons = loops0;
for (size_t i = 1; i < n_contact_loops; ++ i)
polygons_append(loop_polygons,
offset2(
loops0,
- int(i) * flow.scaled_spacing() - 0.5f * flow.scaled_spacing(),
0.5f * flow.scaled_spacing()));
// Clip such loops to the side oriented towards the object.
// Collect split points, so they will be recognized after the clipping.
// At the split points the clipped pieces will be stitched back together.
loop_lines.reserve(loop_polygons.size());
std::unordered_map<Point, int, PointHash> map_split_points;
for (Polygons::const_iterator it = loop_polygons.begin(); it != loop_polygons.end(); ++ it) {
assert(map_split_points.find(it->first_point()) == map_split_points.end());
map_split_points[it->first_point()] = -1;
loop_lines.push_back(it->split_at_first_point());
}
loop_lines = intersection_pl(loop_lines, offset(overhang_polygons, scale_(SUPPORT_MATERIAL_MARGIN)));
// Because a closed loop has been split to a line, loop_lines may contain continuous segments split to 2 pieces.
// Try to connect them.
for (int i_line = 0; i_line < int(loop_lines.size()); ++ i_line) {
Polyline &polyline = loop_lines[i_line];
auto it = map_split_points.find(polyline.first_point());
if (it != map_split_points.end()) {
// This is a stitching point.
// If this assert triggers, multiple source polygons likely intersected at this point.
assert(it->second != -2);
if (it->second < 0) {
// First occurence.
it->second = i_line;
} else {
// Second occurence. Join the lines.
Polyline &polyline_1st = loop_lines[it->second];
assert(polyline_1st.first_point() == it->first || polyline_1st.last_point() == it->first);
if (polyline_1st.first_point() == it->first)
polyline_1st.reverse();
polyline_1st.append(std::move(polyline));
it->second = -2;
}
continue;
}
it = map_split_points.find(polyline.last_point());
if (it != map_split_points.end()) {
// This is a stitching point.
// If this assert triggers, multiple source polygons likely intersected at this point.
assert(it->second != -2);
if (it->second < 0) {
// First occurence.
it->second = i_line;
} else {
// Second occurence. Join the lines.
Polyline &polyline_1st = loop_lines[it->second];
assert(polyline_1st.first_point() == it->first || polyline_1st.last_point() == it->first);
if (polyline_1st.first_point() == it->first)
polyline_1st.reverse();
polyline.reverse();
polyline_1st.append(std::move(polyline));
it->second = -2;
}
}
}
// Remove empty lines.
remove_degenerate(loop_lines);
}
// add the contact infill area to the interface area
// note that growing loops by $circle_radius ensures no tiny
// extrusions are left inside the circles; however it creates
// a very large gap between loops and contact_infill_polygons, so maybe another
// solution should be found to achieve both goals
// Store the trimmed polygons into a separate polygon set, so the original infill area remains intact for
// "modulate by layer thickness".
top_contact_layer.set_polygons_to_extrude(diff(top_contact_layer.layer->polygons, offset(loop_lines, float(circle_radius * 1.1))));
// Transform loops into ExtrusionPath objects.
extrusion_entities_append_paths(
top_contact_layer.extrusions,
STDMOVE(loop_lines),
erSupportMaterialInterface, flow.mm3_per_mm(), flow.width, flow.height);
}
#ifdef SLIC3R_DEBUG
static std::string dbg_index_to_color(int idx)
{
if (idx < 0)
return "yellow";
idx = idx % 3;
switch (idx) {
case 0: return "red";
case 1: return "green";
default: return "blue";
}
}
#endif /* SLIC3R_DEBUG */
// When extruding a bottom interface layer over an object, the bottom interface layer is extruded in a thin air, therefore
// it is being extruded with a bridging flow to not shrink excessively (the die swell effect).
// Tiny extrusions are better avoided and it is always better to anchor the thread to an existing support structure if possible.
// Therefore the bottom interface spots are expanded a bit. The expanded regions may overlap with another bottom interface layers,
// leading to over extrusion, where they overlap. The over extrusion is better avoided as it often makes the interface layers
// to stick too firmly to the object.
void modulate_extrusion_by_overlapping_layers(
// Extrusions generated for this_layer.
ExtrusionEntitiesPtr &extrusions_in_out,
const PrintObjectSupportMaterial::MyLayer &this_layer,
// Multiple layers overlapping with this_layer, sorted bottom up.
const PrintObjectSupportMaterial::MyLayersPtr &overlapping_layers)
{
size_t n_overlapping_layers = overlapping_layers.size();
if (n_overlapping_layers == 0 || extrusions_in_out.empty())
// The extrusions do not overlap with any other extrusion.
return;
// Get the initial extrusion parameters.
ExtrusionPath *extrusion_path_template = dynamic_cast<ExtrusionPath*>(extrusions_in_out.front());
assert(extrusion_path_template != nullptr);
ExtrusionRole extrusion_role = extrusion_path_template->role();
float extrusion_width = extrusion_path_template->width;
struct ExtrusionPathFragment
{
ExtrusionPathFragment() : mm3_per_mm(-1), width(-1), height(-1) {};
ExtrusionPathFragment(double mm3_per_mm, float width, float height) : mm3_per_mm(mm3_per_mm), width(width), height(height) {};
Polylines polylines;
double mm3_per_mm;
float width;
float height;
};
// Split the extrusions by the overlapping layers, reduce their extrusion rate.
// The last path_fragment is from this_layer.
std::vector<ExtrusionPathFragment> path_fragments(
n_overlapping_layers + 1,
ExtrusionPathFragment(extrusion_path_template->mm3_per_mm, extrusion_path_template->width, extrusion_path_template->height));
// Don't use it, it will be released.
extrusion_path_template = nullptr;
#ifdef SLIC3R_DEBUG
static int iRun = 0;
++ iRun;
BoundingBox bbox;
for (size_t i_overlapping_layer = 0; i_overlapping_layer < n_overlapping_layers; ++ i_overlapping_layer) {
const PrintObjectSupportMaterial::MyLayer &overlapping_layer = *overlapping_layers[i_overlapping_layer];
bbox.merge(get_extents(overlapping_layer.polygons));
}
for (ExtrusionEntitiesPtr::const_iterator it = extrusions_in_out.begin(); it != extrusions_in_out.end(); ++ it) {
ExtrusionPath *path = dynamic_cast<ExtrusionPath*>(*it);
assert(path != nullptr);
bbox.merge(get_extents(path->polyline));
}
SVG svg(debug_out_path("support-fragments-%d-%lf.svg", iRun, this_layer.print_z).c_str(), bbox);
const float transparency = 0.5f;
// Filled polygons for the overlapping regions.
svg.draw(union_ex(this_layer.polygons), dbg_index_to_color(-1), transparency);
for (size_t i_overlapping_layer = 0; i_overlapping_layer < n_overlapping_layers; ++ i_overlapping_layer) {
const PrintObjectSupportMaterial::MyLayer &overlapping_layer = *overlapping_layers[i_overlapping_layer];
svg.draw(union_ex(overlapping_layer.polygons), dbg_index_to_color(int(i_overlapping_layer)), transparency);
}
// Contours of the overlapping regions.
svg.draw(to_polylines(this_layer.polygons), dbg_index_to_color(-1), scale_(0.2));
for (size_t i_overlapping_layer = 0; i_overlapping_layer < n_overlapping_layers; ++ i_overlapping_layer) {
const PrintObjectSupportMaterial::MyLayer &overlapping_layer = *overlapping_layers[i_overlapping_layer];
svg.draw(to_polylines(overlapping_layer.polygons), dbg_index_to_color(int(i_overlapping_layer)), scale_(0.1));
}
// Fill extrusion, the source.
for (ExtrusionEntitiesPtr::const_iterator it = extrusions_in_out.begin(); it != extrusions_in_out.end(); ++ it) {
ExtrusionPath *path = dynamic_cast<ExtrusionPath*>(*it);
std::string color_name;
switch ((it - extrusions_in_out.begin()) % 9) {
case 0: color_name = "magenta"; break;
case 1: color_name = "deepskyblue"; break;
case 2: color_name = "coral"; break;
case 3: color_name = "goldenrod"; break;
case 4: color_name = "orange"; break;
case 5: color_name = "olivedrab"; break;
case 6: color_name = "blueviolet"; break;
case 7: color_name = "brown"; break;
default: color_name = "orchid"; break;
}
svg.draw(path->polyline, color_name, scale_(0.2));
}
#endif /* SLIC3R_DEBUG */
// End points of the original paths.
std::vector<std::pair<Point, Point>> path_ends;
// Collect the paths of this_layer.
{
Polylines &polylines = path_fragments.back().polylines;
for (ExtrusionEntitiesPtr::const_iterator it = extrusions_in_out.begin(); it != extrusions_in_out.end(); ++ it) {
ExtrusionPath *path = dynamic_cast<ExtrusionPath*>(*it);
assert(path != nullptr);
polylines.emplace_back(Polyline(std::move(path->polyline)));
path_ends.emplace_back(std::pair<Point, Point>(polylines.back().points.front(), polylines.back().points.back()));
}
}
// Destroy the original extrusion paths, their polylines were moved to path_fragments already.
// This will be the destination for the new paths.
extrusions_in_out.clear();
// Fragment the path segments by overlapping layers. The overlapping layers are sorted by an increasing print_z.
// Trim by the highest overlapping layer first.
for (int i_overlapping_layer = int(n_overlapping_layers) - 1; i_overlapping_layer >= 0; -- i_overlapping_layer) {
const PrintObjectSupportMaterial::MyLayer &overlapping_layer = *overlapping_layers[i_overlapping_layer];
ExtrusionPathFragment &frag = path_fragments[i_overlapping_layer];
Polygons polygons_trimming = offset(union_ex(overlapping_layer.polygons), float(scale_(0.5*extrusion_width)));
frag.polylines = intersection_pl(path_fragments.back().polylines, polygons_trimming, false);
path_fragments.back().polylines = diff_pl(path_fragments.back().polylines, polygons_trimming, false);
// Adjust the extrusion parameters for a reduced layer height and a non-bridging flow (nozzle_dmr = -1, does not matter).
assert(this_layer.print_z > overlapping_layer.print_z);
frag.height = float(this_layer.print_z - overlapping_layer.print_z);
frag.mm3_per_mm = Flow(frag.width, frag.height, -1.f, false).mm3_per_mm();
#ifdef SLIC3R_DEBUG
svg.draw(frag.polylines, dbg_index_to_color(i_overlapping_layer), scale_(0.1));
#endif /* SLIC3R_DEBUG */
}
#ifdef SLIC3R_DEBUG
svg.draw(path_fragments.back().polylines, dbg_index_to_color(-1), scale_(0.1));
svg.Close();
#endif /* SLIC3R_DEBUG */
// Now chain the split segments using hashing and a nearly exact match, maintaining the order of segments.
// Create a single ExtrusionPath or ExtrusionEntityCollection per source ExtrusionPath.
// Map of fragment start/end points to a pair of <i_overlapping_layer, i_polyline_in_layer>
// Because a non-exact matching is used for the end points, a multi-map is used.
// As the clipper library may reverse the order of some clipped paths, store both ends into the map.
struct ExtrusionPathFragmentEnd
{
ExtrusionPathFragmentEnd(size_t alayer_idx, size_t apolyline_idx, bool ais_start) :
layer_idx(alayer_idx), polyline_idx(apolyline_idx), is_start(ais_start) {}
size_t layer_idx;
size_t polyline_idx;
bool is_start;
};
class ExtrusionPathFragmentEndPointAccessor {
public:
ExtrusionPathFragmentEndPointAccessor(const std::vector<ExtrusionPathFragment> &path_fragments) : m_path_fragments(path_fragments) {}
// Return an end point of a fragment, or nullptr if the fragment has been consumed already.
const Point* operator()(const ExtrusionPathFragmentEnd &fragment_end) const {
const Polyline &polyline = m_path_fragments[fragment_end.layer_idx].polylines[fragment_end.polyline_idx];
return polyline.points.empty() ? nullptr :
(fragment_end.is_start ? &polyline.points.front() : &polyline.points.back());
}
private:
ExtrusionPathFragmentEndPointAccessor& operator=(const ExtrusionPathFragmentEndPointAccessor&);
const std::vector<ExtrusionPathFragment> &m_path_fragments;
};
const coord_t search_radius = 7;
ClosestPointInRadiusLookup<ExtrusionPathFragmentEnd, ExtrusionPathFragmentEndPointAccessor> map_fragment_starts(
search_radius, ExtrusionPathFragmentEndPointAccessor(path_fragments));
for (size_t i_overlapping_layer = 0; i_overlapping_layer <= n_overlapping_layers; ++ i_overlapping_layer) {
const Polylines &polylines = path_fragments[i_overlapping_layer].polylines;
for (size_t i_polyline = 0; i_polyline < polylines.size(); ++ i_polyline) {
// Map a starting point of a polyline to a pair of <layer, polyline>
if (polylines[i_polyline].points.size() >= 2) {
map_fragment_starts.insert(ExtrusionPathFragmentEnd(i_overlapping_layer, i_polyline, true));
map_fragment_starts.insert(ExtrusionPathFragmentEnd(i_overlapping_layer, i_polyline, false));
}
}
}
// For each source path:
for (size_t i_path = 0; i_path < path_ends.size(); ++ i_path) {
const Point &pt_start = path_ends[i_path].first;
const Point &pt_end = path_ends[i_path].second;
Point pt_current = pt_start;
// Find a chain of fragments with the original / reduced print height.
ExtrusionMultiPath multipath;
for (;;) {
// Find a closest end point to pt_current.
std::pair<const ExtrusionPathFragmentEnd*, coordf_t> end_and_dist2 = map_fragment_starts.find(pt_current);
// There may be a bug in Clipper flipping the order of two last points in a fragment?
// assert(end_and_dist2.first != nullptr);
assert(end_and_dist2.first == nullptr || end_and_dist2.second < search_radius * search_radius);
if (end_and_dist2.first == nullptr) {
// New fragment connecting to pt_current was not found.
// Verify that the last point found is close to the original end point of the unfragmented path.
//const double d2 = pt_end.distance_to_sq(pt_current);
//assert(d2 < coordf_t(search_radius * search_radius));
// End of the path.
break;
}
const ExtrusionPathFragmentEnd &fragment_end_min = *end_and_dist2.first;
// Fragment to consume.
ExtrusionPathFragment &frag = path_fragments[fragment_end_min.layer_idx];
Polyline &frag_polyline = frag.polylines[fragment_end_min.polyline_idx];
// Path to append the fragment to.
ExtrusionPath *path = multipath.paths.empty() ? nullptr : &multipath.paths.back();
if (path != nullptr) {
// Verify whether the path is compatible with the current fragment.
assert(this_layer.layer_type == PrintObjectSupportMaterial::sltBottomContact || path->height != frag.height || path->mm3_per_mm != frag.mm3_per_mm);
if (path->height != frag.height || path->mm3_per_mm != frag.mm3_per_mm) {
path = nullptr;
}
// Merging with the previous path. This can only happen if the current layer was reduced by a base layer, which was split into a base and interface layer.
}
if (path == nullptr) {
// Allocate a new path.
multipath.paths.push_back(ExtrusionPath(extrusion_role, frag.mm3_per_mm, frag.width, frag.height));
path = &multipath.paths.back();
}
// The Clipper library may flip the order of the clipped polylines arbitrarily.
// Reverse the source polyline, if connecting to the end.
if (! fragment_end_min.is_start)
frag_polyline.reverse();
// Enforce exact overlap of the end points of successive fragments.
assert(frag_polyline.points.front() == pt_current);
frag_polyline.points.front() = pt_current;
// Don't repeat the first point.
if (! path->polyline.points.empty())
path->polyline.points.pop_back();
// Consume the fragment's polyline, remove it from the input fragments, so it will be ignored the next time.
path->polyline.append(std::move(frag_polyline));
frag_polyline.points.clear();
pt_current = path->polyline.points.back();
if (pt_current == pt_end) {
// End of the path.
break;
}
}
if (!multipath.paths.empty()) {
if (multipath.paths.size() == 1) {
// This path was not fragmented.
extrusions_in_out.push_back(new ExtrusionPath(std::move(multipath.paths.front())));
} else {
// This path was fragmented. Copy the collection as a whole object, so the order inside the collection will not be changed
// during the chaining of extrusions_in_out.
extrusions_in_out.push_back(new ExtrusionMultiPath(std::move(multipath)));
}
}
}
// If there are any non-consumed fragments, add them separately.
//FIXME this shall not happen, if the Clipper works as expected and all paths split to fragments could be re-connected.
for (auto it_fragment = path_fragments.begin(); it_fragment != path_fragments.end(); ++ it_fragment)
extrusion_entities_append_paths(extrusions_in_out, std::move(it_fragment->polylines), extrusion_role, it_fragment->mm3_per_mm, it_fragment->width, it_fragment->height);
}
void PrintObjectSupportMaterial::generate_toolpaths(
const PrintObject &object,
const MyLayersPtr &raft_layers,
const MyLayersPtr &bottom_contacts,
const MyLayersPtr &top_contacts,
const MyLayersPtr &intermediate_layers,
const MyLayersPtr &interface_layers) const
{
// Slic3r::debugf "Generating patterns\n";
// loop_interface_processor with a given circle radius.
LoopInterfaceProcessor loop_interface_processor(1.5 * m_support_material_interface_flow.scaled_width());
loop_interface_processor.n_contact_loops = this->has_contact_loops() ? 1 : 0;
float base_angle = Geometry::deg2rad(float(m_object_config->support_material_angle.value));
float interface_angle = Geometry::deg2rad(float(m_object_config->support_material_angle.value + 90.));
coordf_t interface_spacing = m_object_config->support_material_interface_spacing.value + m_support_material_interface_flow.spacing();
coordf_t interface_density = std::min(1., m_support_material_interface_flow.spacing() / interface_spacing);
coordf_t support_spacing = m_object_config->support_material_spacing.value + m_support_material_flow.spacing();
coordf_t support_density = std::min(1., m_support_material_flow.spacing() / support_spacing);
if (m_object_config->support_material_interface_layers.value == 0) {
// No interface layers allowed, print everything with the base support pattern.
interface_spacing = support_spacing;
interface_density = support_density;
}
// Prepare fillers.
SupportMaterialPattern support_pattern = m_object_config->support_material_pattern;
bool with_sheath = m_object_config->support_material_with_sheath;
InfillPattern infill_pattern;
std::vector<float> angles;
angles.push_back(base_angle);
switch (support_pattern) {
case smpRectilinearGrid:
angles.push_back(interface_angle);
// fall through
case smpRectilinear:
infill_pattern = ipRectilinear;
break;
case smpHoneycomb:
case smpPillars:
infill_pattern = ipHoneycomb;
break;
}
BoundingBox bbox_object(Point(-scale_(1.), -scale_(1.0)), Point(scale_(1.), scale_(1.)));
// const coordf_t link_max_length_factor = 3.;
const coordf_t link_max_length_factor = 0.;
float raft_angle_1st_layer = 0.f;
float raft_angle_base = 0.f;
float raft_angle_interface = 0.f;
if (m_slicing_params.base_raft_layers > 1) {
// There are all raft layer types (1st layer, base, interface & contact layers) available.
raft_angle_1st_layer = interface_angle;
raft_angle_base = base_angle;
raft_angle_interface = interface_angle;
} else if (m_slicing_params.base_raft_layers == 1 || m_slicing_params.interface_raft_layers > 1) {
// 1st layer, interface & contact layers available.
raft_angle_1st_layer = base_angle;
if (this->has_support())
// Print 1st layer at 45 degrees from both the interface and base angles as both can land on the 1st layer.
raft_angle_1st_layer += 0.7854f;
raft_angle_interface = interface_angle;
} else if (m_slicing_params.interface_raft_layers == 1) {
// Only the contact raft layer is non-empty, which will be printed as the 1st layer.
assert(m_slicing_params.base_raft_layers == 0);
assert(m_slicing_params.interface_raft_layers == 1);
assert(m_slicing_params.raft_layers() == 1 && raft_layers.size() == 0);
} else {
// No raft.
assert(m_slicing_params.base_raft_layers == 0);
assert(m_slicing_params.interface_raft_layers == 0);
assert(m_slicing_params.raft_layers() == 0 && raft_layers.size() == 0);
}
// Insert the raft base layers.
size_t n_raft_layers = size_t(std::max(0, int(m_slicing_params.raft_layers()) - 1));
tbb::parallel_for(tbb::blocked_range<size_t>(0, n_raft_layers),
[this, &object, &raft_layers,
infill_pattern, &bbox_object, support_density, interface_density, raft_angle_1st_layer, raft_angle_base, raft_angle_interface, link_max_length_factor, with_sheath]
(const tbb::blocked_range<size_t>& range) {
for (size_t support_layer_id = range.begin(); support_layer_id < range.end(); ++ support_layer_id)
{
assert(support_layer_id < raft_layers.size());
SupportLayer &support_layer = *object.support_layers[support_layer_id];
assert(support_layer.support_fills.entities.empty());
MyLayer &raft_layer = *raft_layers[support_layer_id];
std::unique_ptr<Fill> filler_interface = std::unique_ptr<Fill>(Fill::new_from_type(ipRectilinear));
std::unique_ptr<Fill> filler_support = std::unique_ptr<Fill>(Fill::new_from_type(infill_pattern));
filler_interface->set_bounding_box(bbox_object);
filler_support->set_bounding_box(bbox_object);
// Print the support base below the support columns, or the support base for the support columns plus the contacts.
if (support_layer_id > 0) {
Polygons to_infill_polygons = (support_layer_id < m_slicing_params.base_raft_layers) ?
raft_layer.polygons :
//FIXME misusing contact_polygons for support columns.
((raft_layer.contact_polygons == nullptr) ? Polygons() : *raft_layer.contact_polygons);
if (! to_infill_polygons.empty()) {
Flow flow(float(m_support_material_flow.width), float(raft_layer.height), m_support_material_flow.nozzle_diameter, raft_layer.bridging);
// find centerline of the external loop/extrusions
ExPolygons to_infill = (support_layer_id == 0 || ! with_sheath) ?
// union_ex(base_polygons, true) :
offset2_ex(to_infill_polygons, float(SCALED_EPSILON), float(- SCALED_EPSILON)) :
offset2_ex(to_infill_polygons, float(SCALED_EPSILON), float(- SCALED_EPSILON - 0.5*flow.scaled_width()));
if (! to_infill.empty() && with_sheath) {
// Draw a perimeter all around the support infill. This makes the support stable, but difficult to remove.
// TODO: use brim ordering algorithm
to_infill_polygons = to_polygons(to_infill);
// TODO: use offset2_ex()
to_infill = offset_ex(to_infill, float(- 0.4 * flow.scaled_spacing()));
extrusion_entities_append_paths(
support_layer.support_fills.entities,
to_polylines(STDMOVE(to_infill_polygons)),
erSupportMaterial, flow.mm3_per_mm(), flow.width, flow.height);
}
if (! to_infill.empty()) {
// We don't use $base_flow->spacing because we need a constant spacing
// value that guarantees that all layers are correctly aligned.
Fill *filler = filler_support.get();
filler->angle = raft_angle_base;
filler->spacing = m_support_material_flow.spacing();
filler->link_max_length = coord_t(scale_(filler->spacing * link_max_length_factor / support_density));
fill_expolygons_generate_paths(
// Destination
support_layer.support_fills.entities,
// Regions to fill
STDMOVE(to_infill),
// Filler and its parameters
filler, float(support_density),
// Extrusion parameters
erSupportMaterial, flow);
}
}
}
Fill *filler = filler_interface.get();
Flow flow = m_first_layer_flow;
float density = 0.f;
if (support_layer_id == 0) {
// Base flange.
filler->angle = raft_angle_1st_layer;
filler->spacing = m_first_layer_flow.spacing();
// 70% of density on the 1st layer.
density = 0.7f;
} else if (support_layer_id >= m_slicing_params.base_raft_layers) {
filler->angle = raft_angle_interface;
// We don't use $base_flow->spacing because we need a constant spacing
// value that guarantees that all layers are correctly aligned.
filler->spacing = m_support_material_flow.spacing();
flow = Flow(float(m_support_material_interface_flow.width), float(raft_layer.height), m_support_material_flow.nozzle_diameter, raft_layer.bridging);
density = float(interface_density);
} else
continue;
filler->link_max_length = coord_t(scale_(filler->spacing * link_max_length_factor / density));
fill_expolygons_generate_paths(
// Destination
support_layer.support_fills.entities,
// Regions to fill
offset2_ex(raft_layer.polygons, float(SCALED_EPSILON), float(- SCALED_EPSILON)),
// Filler and its parameters
filler, density,
// Extrusion parameters
(support_layer_id < m_slicing_params.base_raft_layers) ? erSupportMaterial : erSupportMaterialInterface, flow);
}
});
struct LayerCacheItem {
LayerCacheItem(MyLayerExtruded *layer_extruded = nullptr) : layer_extruded(layer_extruded) {}
MyLayerExtruded *layer_extruded;
std::vector<MyLayer*> overlapping;
};
struct LayerCache {
MyLayerExtruded bottom_contact_layer;
MyLayerExtruded top_contact_layer;
MyLayerExtruded base_layer;
MyLayerExtruded interface_layer;
std::vector<LayerCacheItem> overlaps;
};
std::vector<LayerCache> layer_caches(object.support_layers.size(), LayerCache());
tbb::parallel_for(tbb::blocked_range<size_t>(n_raft_layers, object.support_layers.size()),
[this, &object, &bottom_contacts, &top_contacts, &intermediate_layers, &interface_layers, &layer_caches, &loop_interface_processor,
infill_pattern, &bbox_object, support_density, interface_density, interface_angle, &angles, link_max_length_factor, with_sheath]
(const tbb::blocked_range<size_t>& range) {
// Indices of the 1st layer in their respective container at the support layer height.
size_t idx_layer_bottom_contact = size_t(-1);
size_t idx_layer_top_contact = size_t(-1);
size_t idx_layer_intermediate = size_t(-1);
size_t idx_layer_inteface = size_t(-1);
std::unique_ptr<Fill> filler_interface = std::unique_ptr<Fill>(Fill::new_from_type(m_slicing_params.soluble_interface ? ipConcentric : ipRectilinear));
std::unique_ptr<Fill> filler_support = std::unique_ptr<Fill>(Fill::new_from_type(infill_pattern));
filler_interface->set_bounding_box(bbox_object);
filler_support->set_bounding_box(bbox_object);
for (size_t support_layer_id = range.begin(); support_layer_id < range.end(); ++ support_layer_id)
{
SupportLayer &support_layer = *object.support_layers[support_layer_id];
LayerCache &layer_cache = layer_caches[support_layer_id];
// Find polygons with the same print_z.
MyLayerExtruded &bottom_contact_layer = layer_cache.bottom_contact_layer;
MyLayerExtruded &top_contact_layer = layer_cache.top_contact_layer;
MyLayerExtruded &base_layer = layer_cache.base_layer;
MyLayerExtruded &interface_layer = layer_cache.interface_layer;
// Increment the layer indices to find a layer at support_layer.print_z.
{
auto fun = [&support_layer](const MyLayer *l){ return l->print_z >= support_layer.print_z - EPSILON; };
idx_layer_bottom_contact = idx_higher_or_equal(bottom_contacts, idx_layer_bottom_contact, fun);
idx_layer_top_contact = idx_higher_or_equal(top_contacts, idx_layer_top_contact, fun);
idx_layer_intermediate = idx_higher_or_equal(intermediate_layers, idx_layer_intermediate, fun);
idx_layer_inteface = idx_higher_or_equal(interface_layers, idx_layer_inteface, fun);
}
// Copy polygons from the layers.
if (idx_layer_bottom_contact < bottom_contacts.size() && bottom_contacts[idx_layer_bottom_contact]->print_z < support_layer.print_z + EPSILON)
bottom_contact_layer.layer = bottom_contacts[idx_layer_bottom_contact];
if (idx_layer_top_contact < top_contacts.size() && top_contacts[idx_layer_top_contact]->print_z < support_layer.print_z + EPSILON)
top_contact_layer.layer = top_contacts[idx_layer_top_contact];
if (idx_layer_inteface < interface_layers.size() && interface_layers[idx_layer_inteface]->print_z < support_layer.print_z + EPSILON)
interface_layer.layer = interface_layers[idx_layer_inteface];
if (idx_layer_intermediate < intermediate_layers.size() && intermediate_layers[idx_layer_intermediate]->print_z < support_layer.print_z + EPSILON)
base_layer.layer = intermediate_layers[idx_layer_intermediate];
if (m_object_config->support_material_interface_layers == 0) {
// If no interface layers were requested, we treat the contact layer exactly as a generic base layer.
if (m_can_merge_support_regions) {
if (base_layer.could_merge(top_contact_layer))
base_layer.merge(std::move(top_contact_layer));
else if (base_layer.empty() && !top_contact_layer.empty() && !top_contact_layer.layer->bridging)
std::swap(base_layer, top_contact_layer);
if (base_layer.could_merge(bottom_contact_layer))
base_layer.merge(std::move(bottom_contact_layer));
else if (base_layer.empty() && !bottom_contact_layer.empty() && !bottom_contact_layer.layer->bridging)
std::swap(base_layer, bottom_contact_layer);
}
} else {
loop_interface_processor.generate(top_contact_layer, m_support_material_interface_flow);
// If no loops are allowed, we treat the contact layer exactly as a generic interface layer.
// Merge interface_layer into top_contact_layer, as the top_contact_layer is not synchronized and therefore it will be used
// to trim other layers.
if (top_contact_layer.could_merge(interface_layer))
top_contact_layer.merge(std::move(interface_layer));
}
if (! interface_layer.empty() && ! base_layer.empty()) {
// turn base support into interface when it's contained in our holes
// (this way we get wider interface anchoring)
//FIXME one wants to fill in the inner most holes of the interfaces, not all the holes.
Polygons islands = top_level_islands(interface_layer.layer->polygons);
polygons_append(interface_layer.layer->polygons, intersection(base_layer.layer->polygons, islands));
base_layer.layer->polygons = diff(base_layer.layer->polygons, islands);
}
// Top and bottom contacts, interface layers.
for (size_t i = 0; i < 3; ++ i) {
MyLayerExtruded &layer_ex = (i == 0) ? top_contact_layer : (i == 1 ? bottom_contact_layer : interface_layer);
if (layer_ex.empty() || layer_ex.polygons_to_extrude().empty())
continue;
//FIXME When paralellizing, each thread shall have its own copy of the fillers.
bool interface_as_base = (&layer_ex == &interface_layer) && m_object_config->support_material_interface_layers.value == 0;
Flow interface_flow(
float(layer_ex.layer->bridging ? layer_ex.layer->height : (interface_as_base ? m_support_material_flow.width : m_support_material_interface_flow.width)),
float(layer_ex.layer->height),
m_support_material_interface_flow.nozzle_diameter,
layer_ex.layer->bridging);
filler_interface->angle = interface_as_base ?
// If zero interface layers are configured, use the same angle as for the base layers.
angles[support_layer_id % angles.size()] :
// Use interface angle for the interface layers.
interface_angle;
filler_interface->spacing = m_support_material_interface_flow.spacing();
filler_interface->link_max_length = coord_t(scale_(filler_interface->spacing * link_max_length_factor / interface_density));
fill_expolygons_generate_paths(
// Destination
layer_ex.extrusions,
// Regions to fill
union_ex(layer_ex.polygons_to_extrude(), true),
// Filler and its parameters
filler_interface.get(), float(interface_density),
// Extrusion parameters
erSupportMaterialInterface, interface_flow);
}
// Base support or flange.
if (! base_layer.empty() && ! base_layer.polygons_to_extrude().empty()) {
//FIXME When paralellizing, each thread shall have its own copy of the fillers.
Fill *filler = filler_support.get();
filler->angle = angles[support_layer_id % angles.size()];
// We don't use $base_flow->spacing because we need a constant spacing
// value that guarantees that all layers are correctly aligned.
Flow flow(
float(base_layer.layer->bridging ? base_layer.layer->height : m_support_material_flow.width),
float(base_layer.layer->height),
m_support_material_flow.nozzle_diameter,
base_layer.layer->bridging);
filler->spacing = m_support_material_flow.spacing();
filler->link_max_length = coord_t(scale_(filler->spacing * link_max_length_factor / support_density));
float density = float(support_density);
// find centerline of the external loop/extrusions
ExPolygons to_infill = (support_layer_id == 0 || ! with_sheath) ?
// union_ex(base_polygons, true) :
offset2_ex(base_layer.polygons_to_extrude(), float(SCALED_EPSILON), float(- SCALED_EPSILON)) :
offset2_ex(base_layer.polygons_to_extrude(), float(SCALED_EPSILON), float(- SCALED_EPSILON - 0.5*flow.scaled_width()));
if (base_layer.layer->bottom_z < EPSILON) {
// Base flange (the 1st layer).
filler = filler_interface.get();
filler->angle = Geometry::deg2rad(float(m_object_config->support_material_angle.value + 90.));
density = 0.5f;
flow = m_first_layer_flow;
// use the proper spacing for first layer as we don't need to align
// its pattern to the other layers
//FIXME When paralellizing, each thread shall have its own copy of the fillers.
filler->spacing = flow.spacing();
filler->link_max_length = coord_t(scale_(filler->spacing * link_max_length_factor / density));
} else if (with_sheath) {
// Draw a perimeter all around the support infill. This makes the support stable, but difficult to remove.
// TODO: use brim ordering algorithm
Polygons to_infill_polygons = to_polygons(to_infill);
// TODO: use offset2_ex()
to_infill = offset_ex(to_infill, - 0.4 * float(flow.scaled_spacing()));
extrusion_entities_append_paths(
base_layer.extrusions,
to_polylines(STDMOVE(to_infill_polygons)),
erSupportMaterial, flow.mm3_per_mm(), flow.width, flow.height);
}
fill_expolygons_generate_paths(
// Destination
base_layer.extrusions,
// Regions to fill
STDMOVE(to_infill),
// Filler and its parameters
filler, density,
// Extrusion parameters
erSupportMaterial, flow);
}
layer_cache.overlaps.reserve(4);
if (! bottom_contact_layer.empty())
layer_cache.overlaps.push_back(&bottom_contact_layer);
if (! top_contact_layer.empty())
layer_cache.overlaps.push_back(&top_contact_layer);
if (! interface_layer.empty())
layer_cache.overlaps.push_back(&interface_layer);
if (! base_layer.empty())
layer_cache.overlaps.push_back(&base_layer);
// Sort the layers with the same print_z coordinate by their heights, thickest first.
std::sort(layer_cache.overlaps.begin(), layer_cache.overlaps.end(), [](const LayerCacheItem &lc1, const LayerCacheItem &lc2) { return lc1.layer_extruded->layer->height > lc2.layer_extruded->layer->height; });
// Collect the support areas with this print_z into islands, as there is no need
// for retraction over these islands.
Polygons polys;
// Collect the extrusions, sorted by the bottom extrusion height.
for (LayerCacheItem &layer_cache_item : layer_cache.overlaps) {
// Collect islands to polys.
layer_cache_item.layer_extruded->polygons_append(polys);
// The print_z of the top contact surfaces and bottom_z of the bottom contact surfaces are "free"
// in a sense that they are not synchronized with other support layers. As the top and bottom contact surfaces
// are inflated to achieve a better anchoring, it may happen, that these surfaces will at least partially
// overlap in Z with another support layers, leading to over-extrusion.
// Mitigate the over-extrusion by modulating the extrusion rate over these regions.
// The print head will follow the same print_z, but the layer thickness will be reduced
// where it overlaps with another support layer.
//FIXME When printing a briging path, what is an equivalent height of the squished extrudate of the same width?
// Collect overlapping top/bottom surfaces.
layer_cache_item.overlapping.reserve(16);
coordf_t bottom_z = layer_cache_item.layer_extruded->layer->bottom_print_z() + EPSILON;
for (int i = int(idx_layer_bottom_contact) - 1; i >= 0 && bottom_contacts[i]->print_z > bottom_z; -- i)
layer_cache_item.overlapping.push_back(bottom_contacts[i]);
for (int i = int(idx_layer_top_contact) - 1; i >= 0 && top_contacts[i]->print_z > bottom_z; -- i)
layer_cache_item.overlapping.push_back(top_contacts[i]);
if (layer_cache_item.layer_extruded->layer->layer_type == sltBottomContact) {
// Bottom contact layer may overlap with a base layer, which may be changed to interface layer.
for (int i = int(idx_layer_intermediate) - 1; i >= 0 && intermediate_layers[i]->print_z > bottom_z; -- i)
layer_cache_item.overlapping.push_back(intermediate_layers[i]);
for (int i = int(idx_layer_inteface) - 1; i >= 0 && interface_layers[i]->print_z > bottom_z; -- i)
layer_cache_item.overlapping.push_back(interface_layers[i]);
}
std::sort(layer_cache_item.overlapping.begin(), layer_cache_item.overlapping.end(), MyLayersPtrCompare());
}
if (! polys.empty())
expolygons_append(support_layer.support_islands.expolygons, union_ex(polys));
/* {
require "Slic3r/SVG.pm";
Slic3r::SVG::output("islands_" . $z . ".svg",
red_expolygons => union_ex($contact),
green_expolygons => union_ex($interface),
green_polylines => [ map $_->unpack->polyline, @{$layer->support_contact_fills} ],
polylines => [ map $_->unpack->polyline, @{$layer->support_fills} ],
);
} */
} // for each support_layer_id
});
// Now modulate the support layer height in parallel.
tbb::parallel_for(tbb::blocked_range<size_t>(n_raft_layers, object.support_layers.size()),
[this, &object, &layer_caches]
(const tbb::blocked_range<size_t>& range) {
for (size_t support_layer_id = range.begin(); support_layer_id < range.end(); ++ support_layer_id) {
SupportLayer &support_layer = *object.support_layers[support_layer_id];
LayerCache &layer_cache = layer_caches[support_layer_id];
for (LayerCacheItem &layer_cache_item : layer_cache.overlaps) {
modulate_extrusion_by_overlapping_layers(layer_cache_item.layer_extruded->extrusions, *layer_cache_item.layer_extruded->layer, layer_cache_item.overlapping);
support_layer.support_fills.append(std::move(layer_cache_item.layer_extruded->extrusions));
}
}
});
}
/*
void PrintObjectSupportMaterial::clip_by_pillars(
const PrintObject &object,
LayersPtr &bottom_contacts,
LayersPtr &top_contacts,
LayersPtr &intermediate_contacts);
{
// this prevents supplying an empty point set to BoundingBox constructor
if (top_contacts.empty())
return;
coord_t pillar_size = scale_(PILLAR_SIZE);
coord_t pillar_spacing = scale_(PILLAR_SPACING);
// A regular grid of pillars, filling the 2D bounding box.
Polygons grid;
{
// Rectangle with a side of 2.5x2.5mm.
Polygon pillar;
pillar.points.push_back(Point(0, 0));
pillar.points.push_back(Point(pillar_size, 0));
pillar.points.push_back(Point(pillar_size, pillar_size));
pillar.points.push_back(Point(0, pillar_size));
// 2D bounding box of the projection of all contact polygons.
BoundingBox bbox;
for (LayersPtr::const_iterator it = top_contacts.begin(); it != top_contacts.end(); ++ it)
bbox.merge(get_extents((*it)->polygons));
grid.reserve(size_t(ceil(bb.size().x / pillar_spacing)) * size_t(ceil(bb.size().y / pillar_spacing)));
for (coord_t x = bb.min.x; x <= bb.max.x - pillar_size; x += pillar_spacing) {
for (coord_t y = bb.min.y; y <= bb.max.y - pillar_size; y += pillar_spacing) {
grid.push_back(pillar);
for (size_t i = 0; i < pillar.points.size(); ++ i)
grid.back().points[i].translate(Point(x, y));
}
}
}
// add pillars to every layer
for my $i (0..n_support_z) {
$shape->[$i] = [ @$grid ];
}
// build capitals
for my $i (0..n_support_z) {
my $z = $support_z->[$i];
my $capitals = intersection(
$grid,
$contact->{$z} // [],
);
// work on one pillar at time (if any) to prevent the capitals from being merged
// but store the contact area supported by the capital because we need to make
// sure nothing is left
my $contact_supported_by_capitals = [];
foreach my $capital (@$capitals) {
// enlarge capital tops
$capital = offset([$capital], +($pillar_spacing - $pillar_size)/2);
push @$contact_supported_by_capitals, @$capital;
for (my $j = $i-1; $j >= 0; $j--) {
my $jz = $support_z->[$j];
$capital = offset($capital, -$self->interface_flow->scaled_width/2);
last if !@$capitals;
push @{ $shape->[$j] }, @$capital;
}
}
// Capitals will not generally cover the whole contact area because there will be
// remainders. For now we handle this situation by projecting such unsupported
// areas to the ground, just like we would do with a normal support.
my $contact_not_supported_by_capitals = diff(
$contact->{$z} // [],
$contact_supported_by_capitals,
);
if (@$contact_not_supported_by_capitals) {
for (my $j = $i-1; $j >= 0; $j--) {
push @{ $shape->[$j] }, @$contact_not_supported_by_capitals;
}
}
}
}
sub clip_with_shape {
my ($self, $support, $shape) = @_;
foreach my $i (keys %$support) {
// don't clip bottom layer with shape so that we
// can generate a continuous base flange
// also don't clip raft layers
next if $i == 0;
next if $i < $self->object_config->raft_layers;
$support->{$i} = intersection(
$support->{$i},
$shape->[$i],
);
}
}
*/
} // namespace Slic3r
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