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PrusaSlicer-NonPlainar/src/libslic3r/PrintObject.cpp
Vojtech Bubnik 2b3d4b2868 WIP TreeSupports: 
1) Reworked the merging code to use an AABB tree for better locality.
   The old code sorted lexicographically, the new code splits bounding
   boxes by the longest axis.
2) Refactored to a functional style with better const correctness.
3) Reduced memory allocation pressure by replacing std::set with
   vectors, in place merging etc.
2022-09-26 11:20:20 +02:00

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#include "Exception.hpp"
#include "Print.hpp"
#include "BoundingBox.hpp"
#include "ClipperUtils.hpp"
#include "ElephantFootCompensation.hpp"
#include "Geometry.hpp"
#include "I18N.hpp"
#include "Layer.hpp"
#include "MutablePolygon.hpp"
#include "SupportMaterial.hpp"
#include "TreeSupport.hpp"
#include "Surface.hpp"
#include "Slicing.hpp"
#include "Tesselate.hpp"
#include "TriangleMeshSlicer.hpp"
#include "Utils.hpp"
#include "Fill/FillAdaptive.hpp"
#include "Fill/FillLightning.hpp"
#include "Format/STL.hpp"
#include "SupportSpotsGenerator.hpp"
#include "TriangleSelectorWrapper.hpp"
#include "format.hpp"
#include <float.h>
#include <string_view>
#include <utility>
#include <boost/log/trivial.hpp>
#include <tbb/parallel_for.h>
using namespace std::literals;
//! macro used to mark string used at localization,
//! return same string
#define L(s) Slic3r::I18N::translate(s)
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
#define SLIC3R_DEBUG
#endif
// #define SLIC3R_DEBUG
// Make assert active if SLIC3R_DEBUG
#ifdef SLIC3R_DEBUG
#undef NDEBUG
#define DEBUG
#define _DEBUG
#include "SVG.hpp"
#undef assert
#include <cassert>
#endif
namespace Slic3r {
// Constructor is called from the main thread, therefore all Model / ModelObject / ModelIntance data are valid.
PrintObject::PrintObject(Print* print, ModelObject* model_object, const Transform3d& trafo, PrintInstances&& instances) :
PrintObjectBaseWithState(print, model_object),
m_trafo(trafo)
{
// Compute centering offet to be applied to our meshes so that we work with smaller coordinates
// requiring less bits to represent Clipper coordinates.
// Snug bounding box of a rotated and scaled object by the 1st instantion, without the instance translation applied.
// All the instances share the transformation matrix with the exception of translation in XY and rotation by Z,
// therefore a bounding box from 1st instance of a ModelObject is good enough for calculating the object center,
// snug height and an approximate bounding box in XY.
BoundingBoxf3 bbox = model_object->raw_bounding_box();
Vec3d bbox_center = bbox.center();
// We may need to rotate the bbox / bbox_center from the original instance to the current instance.
double z_diff = Geometry::rotation_diff_z(model_object->instances.front()->get_rotation(), instances.front().model_instance->get_rotation());
if (std::abs(z_diff) > EPSILON) {
auto z_rot = Eigen::AngleAxisd(z_diff, Vec3d::UnitZ());
bbox = bbox.transformed(Transform3d(z_rot));
bbox_center = (z_rot * bbox_center).eval();
}
// Center of the transformed mesh (without translation).
m_center_offset = Point::new_scale(bbox_center.x(), bbox_center.y());
// Size of the transformed mesh. This bounding may not be snug in XY plane, but it is snug in Z.
m_size = (bbox.size() * (1. / SCALING_FACTOR)).cast<coord_t>();
this->set_instances(std::move(instances));
}
PrintBase::ApplyStatus PrintObject::set_instances(PrintInstances &&instances)
{
for (PrintInstance &i : instances)
// Add the center offset, which will be subtracted from the mesh when slicing.
i.shift += m_center_offset;
// Invalidate and set copies.
PrintBase::ApplyStatus status = PrintBase::APPLY_STATUS_UNCHANGED;
bool equal_length = instances.size() == m_instances.size();
bool equal = equal_length && std::equal(instances.begin(), instances.end(), m_instances.begin(),
[](const PrintInstance& lhs, const PrintInstance& rhs) { return lhs.model_instance == rhs.model_instance && lhs.shift == rhs.shift; });
if (! equal) {
status = PrintBase::APPLY_STATUS_CHANGED;
if (m_print->invalidate_steps({ psSkirtBrim, psGCodeExport }) ||
(! equal_length && m_print->invalidate_step(psWipeTower)))
status = PrintBase::APPLY_STATUS_INVALIDATED;
m_instances = std::move(instances);
for (PrintInstance &i : m_instances)
i.print_object = this;
}
return status;
}
std::vector<std::reference_wrapper<const PrintRegion>> PrintObject::all_regions() const
{
std::vector<std::reference_wrapper<const PrintRegion>> out;
out.reserve(m_shared_regions->all_regions.size());
for (const std::unique_ptr<Slic3r::PrintRegion> &region : m_shared_regions->all_regions)
out.emplace_back(*region.get());
return out;
}
// 1) Merges typed region slices into stInternal type.
// 2) Increases an "extra perimeters" counter at region slices where needed.
// 3) Generates perimeters, gap fills and fill regions (fill regions of type stInternal).
void PrintObject::make_perimeters()
{
// prerequisites
this->slice();
if (! this->set_started(posPerimeters))
return;
m_print->set_status(20, L("Generating perimeters"));
BOOST_LOG_TRIVIAL(info) << "Generating perimeters..." << log_memory_info();
// Revert the typed slices into untyped slices.
if (m_typed_slices) {
for (Layer *layer : m_layers) {
layer->restore_untyped_slices();
m_print->throw_if_canceled();
}
m_typed_slices = false;
}
// compare each layer to the one below, and mark those slices needing
// one additional inner perimeter, like the top of domed objects-
// this algorithm makes sure that at least one perimeter is overlapping
// but we don't generate any extra perimeter if fill density is zero, as they would be floating
// inside the object - infill_only_where_needed should be the method of choice for printing
// hollow objects
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++ region_id) {
const PrintRegion &region = this->printing_region(region_id);
if (! region.config().extra_perimeters || region.config().perimeters == 0 || region.config().fill_density == 0 || this->layer_count() < 2)
continue;
BOOST_LOG_TRIVIAL(debug) << "Generating extra perimeters for region " << region_id << " in parallel - start";
tbb::parallel_for(
tbb::blocked_range<size_t>(0, m_layers.size() - 1),
[this, &region, region_id](const tbb::blocked_range<size_t>& range) {
for (size_t layer_idx = range.begin(); layer_idx < range.end(); ++ layer_idx) {
m_print->throw_if_canceled();
LayerRegion &layerm = *m_layers[layer_idx]->get_region(region_id);
const LayerRegion &upper_layerm = *m_layers[layer_idx+1]->get_region(region_id);
const Polygons upper_layerm_polygons = to_polygons(upper_layerm.slices.surfaces);
// Filter upper layer polygons in intersection_ppl by their bounding boxes?
// my $upper_layerm_poly_bboxes= [ map $_->bounding_box, @{$upper_layerm_polygons} ];
const double total_loop_length = total_length(upper_layerm_polygons);
const coord_t perimeter_spacing = layerm.flow(frPerimeter).scaled_spacing();
const Flow ext_perimeter_flow = layerm.flow(frExternalPerimeter);
const coord_t ext_perimeter_width = ext_perimeter_flow.scaled_width();
const coord_t ext_perimeter_spacing = ext_perimeter_flow.scaled_spacing();
for (Surface &slice : layerm.slices.surfaces) {
for (;;) {
// compute the total thickness of perimeters
const coord_t perimeters_thickness = ext_perimeter_width/2 + ext_perimeter_spacing/2
+ (region.config().perimeters-1 + slice.extra_perimeters) * perimeter_spacing;
// define a critical area where we don't want the upper slice to fall into
// (it should either lay over our perimeters or outside this area)
const coord_t critical_area_depth = coord_t(perimeter_spacing * 1.5);
const Polygons critical_area = diff(
offset(slice.expolygon, float(- perimeters_thickness)),
offset(slice.expolygon, float(- perimeters_thickness - critical_area_depth))
);
// check whether a portion of the upper slices falls inside the critical area
const Polylines intersection = intersection_pl(to_polylines(upper_layerm_polygons), critical_area);
// only add an additional loop if at least 30% of the slice loop would benefit from it
if (total_length(intersection) <= total_loop_length*0.3)
break;
/*
if (0) {
require "Slic3r/SVG.pm";
Slic3r::SVG::output(
"extra.svg",
no_arrows => 1,
expolygons => union_ex($critical_area),
polylines => [ map $_->split_at_first_point, map $_->p, @{$upper_layerm->slices} ],
);
}
*/
++ slice.extra_perimeters;
}
#ifdef DEBUG
if (slice.extra_perimeters > 0)
printf(" adding %d more perimeter(s) at layer %zu\n", slice.extra_perimeters, layer_idx);
#endif
}
}
});
m_print->throw_if_canceled();
BOOST_LOG_TRIVIAL(debug) << "Generating extra perimeters for region " << region_id << " in parallel - end";
}
BOOST_LOG_TRIVIAL(debug) << "Generating perimeters in parallel - start";
tbb::parallel_for(
tbb::blocked_range<size_t>(0, m_layers.size()),
[this](const tbb::blocked_range<size_t>& range) {
for (size_t layer_idx = range.begin(); layer_idx < range.end(); ++ layer_idx) {
m_print->throw_if_canceled();
m_layers[layer_idx]->make_perimeters();
}
}
);
m_print->throw_if_canceled();
BOOST_LOG_TRIVIAL(debug) << "Generating perimeters in parallel - end";
this->set_done(posPerimeters);
}
void PrintObject::prepare_infill()
{
if (! this->set_started(posPrepareInfill))
return;
m_print->set_status(30, L("Preparing infill"));
if (m_typed_slices) {
// To improve robustness of detect_surfaces_type() when reslicing (working with typed slices), see GH issue #7442.
// The preceding step (perimeter generator) only modifies extra_perimeters and the extra perimeters are only used by discover_vertical_shells()
// with more than a single region. If this step does not use Surface::extra_perimeters or Surface::extra_perimeters is always zero, it is safe
// to reset to the untyped slices before re-runnning detect_surfaces_type().
for (Layer* layer : m_layers) {
layer->restore_untyped_slices_no_extra_perimeters();
m_print->throw_if_canceled();
}
}
// This will assign a type (top/bottom/internal) to $layerm->slices.
// Then the classifcation of $layerm->slices is transfered onto
// the $layerm->fill_surfaces by clipping $layerm->fill_surfaces
// by the cummulative area of the previous $layerm->fill_surfaces.
this->detect_surfaces_type();
m_print->throw_if_canceled();
// Decide what surfaces are to be filled.
// Here the stTop / stBottomBridge / stBottom infill is turned to just stInternal if zero top / bottom infill layers are configured.
// Also tiny stInternal surfaces are turned to stInternalSolid.
BOOST_LOG_TRIVIAL(info) << "Preparing fill surfaces..." << log_memory_info();
for (auto *layer : m_layers)
for (auto *region : layer->m_regions) {
region->prepare_fill_surfaces();
m_print->throw_if_canceled();
}
// this will detect bridges and reverse bridges
// and rearrange top/bottom/internal surfaces
// It produces enlarged overlapping bridging areas.
//
// 1) stBottomBridge / stBottom infill is grown by 3mm and clipped by the total infill area. Bridges are detected. The areas may overlap.
// 2) stTop is grown by 3mm and clipped by the grown bottom areas. The areas may overlap.
// 3) Clip the internal surfaces by the grown top/bottom surfaces.
// 4) Merge surfaces with the same style. This will mostly get rid of the overlaps.
//FIXME This does not likely merge surfaces, which are supported by a material with different colors, but same properties.
this->process_external_surfaces();
m_print->throw_if_canceled();
// Add solid fills to ensure the shell vertical thickness.
this->discover_vertical_shells();
m_print->throw_if_canceled();
// Debugging output.
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++ region_id) {
for (const Layer *layer : m_layers) {
LayerRegion *layerm = layer->m_regions[region_id];
layerm->export_region_slices_to_svg_debug("6_discover_vertical_shells-final");
layerm->export_region_fill_surfaces_to_svg_debug("6_discover_vertical_shells-final");
} // for each layer
} // for each region
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
// Detect, which fill surfaces are near external layers.
// They will be split in internal and internal-solid surfaces.
// The purpose is to add a configurable number of solid layers to support the TOP surfaces
// and to add a configurable number of solid layers above the BOTTOM / BOTTOMBRIDGE surfaces
// to close these surfaces reliably.
//FIXME Vojtech: Is this a good place to add supporting infills below sloping perimeters?
this->discover_horizontal_shells();
m_print->throw_if_canceled();
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++ region_id) {
for (const Layer *layer : m_layers) {
LayerRegion *layerm = layer->m_regions[region_id];
layerm->export_region_slices_to_svg_debug("7_discover_horizontal_shells-final");
layerm->export_region_fill_surfaces_to_svg_debug("7_discover_horizontal_shells-final");
} // for each layer
} // for each region
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
// Only active if config->infill_only_where_needed. This step trims the sparse infill,
// so it acts as an internal support. It maintains all other infill types intact.
// Here the internal surfaces and perimeters have to be supported by the sparse infill.
//FIXME The surfaces are supported by a sparse infill, but the sparse infill is only as large as the area to support.
// Likely the sparse infill will not be anchored correctly, so it will not work as intended.
// Also one wishes the perimeters to be supported by a full infill.
this->clip_fill_surfaces();
m_print->throw_if_canceled();
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++ region_id) {
for (const Layer *layer : m_layers) {
LayerRegion *layerm = layer->m_regions[region_id];
layerm->export_region_slices_to_svg_debug("8_clip_surfaces-final");
layerm->export_region_fill_surfaces_to_svg_debug("8_clip_surfaces-final");
} // for each layer
} // for each region
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
// the following step needs to be done before combination because it may need
// to remove only half of the combined infill
this->bridge_over_infill();
m_print->throw_if_canceled();
// combine fill surfaces to honor the "infill every N layers" option
this->combine_infill();
m_print->throw_if_canceled();
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++ region_id) {
for (const Layer *layer : m_layers) {
LayerRegion *layerm = layer->m_regions[region_id];
layerm->export_region_slices_to_svg_debug("9_prepare_infill-final");
layerm->export_region_fill_surfaces_to_svg_debug("9_prepare_infill-final");
} // for each layer
} // for each region
for (const Layer *layer : m_layers) {
layer->export_region_slices_to_svg_debug("9_prepare_infill-final");
layer->export_region_fill_surfaces_to_svg_debug("9_prepare_infill-final");
} // for each layer
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
this->set_done(posPrepareInfill);
}
void PrintObject::infill()
{
// prerequisites
this->prepare_infill();
if (this->set_started(posInfill)) {
auto [adaptive_fill_octree, support_fill_octree] = this->prepare_adaptive_infill_data();
auto lightning_generator = this->prepare_lightning_infill_data();
BOOST_LOG_TRIVIAL(debug) << "Filling layers in parallel - start";
tbb::parallel_for(
tbb::blocked_range<size_t>(0, m_layers.size()),
[this, &adaptive_fill_octree = adaptive_fill_octree, &support_fill_octree = support_fill_octree, &lightning_generator](const tbb::blocked_range<size_t>& range) {
for (size_t layer_idx = range.begin(); layer_idx < range.end(); ++ layer_idx) {
m_print->throw_if_canceled();
m_layers[layer_idx]->make_fills(adaptive_fill_octree.get(), support_fill_octree.get(), lightning_generator.get());
}
}
);
m_print->throw_if_canceled();
BOOST_LOG_TRIVIAL(debug) << "Filling layers in parallel - end";
/* we could free memory now, but this would make this step not idempotent
### $_->fill_surfaces->clear for map @{$_->regions}, @{$object->layers};
*/
this->set_done(posInfill);
}
}
void PrintObject::ironing()
{
if (this->set_started(posIroning)) {
BOOST_LOG_TRIVIAL(debug) << "Ironing in parallel - start";
tbb::parallel_for(
// Ironing starting with layer 0 to support ironing all surfaces.
tbb::blocked_range<size_t>(0, m_layers.size()),
[this](const tbb::blocked_range<size_t>& range) {
for (size_t layer_idx = range.begin(); layer_idx < range.end(); ++ layer_idx) {
m_print->throw_if_canceled();
m_layers[layer_idx]->make_ironing();
}
}
);
m_print->throw_if_canceled();
BOOST_LOG_TRIVIAL(debug) << "Ironing in parallel - end";
this->set_done(posIroning);
}
}
/*
std::vector<size_t> problematic_layers = SupportSpotsGenerator::quick_search(this);
if (!problematic_layers.empty()) {
std::cout << "Object needs supports" << std::endl;
this->active_step_add_warning(PrintStateBase::WarningLevel::CRITICAL,
L("Supportable issues found. Consider enabling supports for this object"));
this->active_step_add_warning(PrintStateBase::WarningLevel::CRITICAL,
L("Supportable issues found. Consider enabling supports for this object"));
for (size_t index = 0; index < std::min(problematic_layers.size(), size_t(4)); ++index) {
this->active_step_add_warning(PrintStateBase::WarningLevel::CRITICAL,
format(L("Layer with issues: %1%"), problematic_layers[index] + 1));
}
}
*/
void PrintObject::generate_support_spots()
{
if (this->set_started(posSupportSpotsSearch)) {
BOOST_LOG_TRIVIAL(debug)
<< "Searching support spots - start";
m_print->set_status(75, L("Searching support spots"));
if (this->m_config.support_material && !this->m_config.support_material_auto &&
std::all_of(this->model_object()->volumes.begin(), this->model_object()->volumes.end(),
[](const ModelVolume* mv){return mv->supported_facets.empty();})
) {
SupportSpotsGenerator::Params params{this->print()->m_config.filament_type.values};
SupportSpotsGenerator::Issues issues = SupportSpotsGenerator::full_search(this, params);
auto obj_transform = this->trafo_centered();
for (ModelVolume *model_volume : this->model_object()->volumes) {
if (model_volume->is_model_part()) {
Transform3d mesh_transformation = obj_transform * model_volume->get_matrix();
Transform3d inv_transform = mesh_transformation.inverse();
TriangleSelectorWrapper selector { model_volume->mesh(), mesh_transformation};
for (const SupportSpotsGenerator::SupportPoint &support_point : issues.support_points) {
Vec3f point = Vec3f(inv_transform.cast<float>() * support_point.position);
Vec3f origin = Vec3f(
inv_transform.cast<float>() * Vec3f(support_point.position.x(), support_point.position.y(), 0.0f));
selector.enforce_spot(point, origin, support_point.spot_radius);
}
model_volume->supported_facets.set(selector.selector);
#if 0 //DEBUG export
indexed_triangle_set copy = model_volume->mesh().its;
its_transform(copy, obj_transform * model_transformation);
its_write_obj(copy,
debug_out_path(("model"+std::to_string(model_volume->id().id)+".obj").c_str()).c_str());
#endif
}
}
}
m_print->throw_if_canceled();
BOOST_LOG_TRIVIAL(debug)
<< "Searching support spots - end";
this->set_done(posSupportSpotsSearch);
}
}
void PrintObject::generate_support_material()
{
if (this->set_started(posSupportMaterial)) {
this->clear_support_layers();
if ((this->has_support() && m_layers.size() > 1) || (this->has_raft() && ! m_layers.empty())) {
m_print->set_status(85, L("Generating support material"));
this->_generate_support_material();
m_print->throw_if_canceled();
} else {
#if 0
// Printing without supports. Empty layer means some objects or object parts are levitating,
// therefore they cannot be printed without supports.
for (const Layer *layer : m_layers)
if (layer->empty())
throw Slic3r::SlicingError("Levitating objects cannot be printed without supports.");
#endif
}
this->set_done(posSupportMaterial);
}
}
std::pair<FillAdaptive::OctreePtr, FillAdaptive::OctreePtr> PrintObject::prepare_adaptive_infill_data()
{
using namespace FillAdaptive;
auto [adaptive_line_spacing, support_line_spacing] = adaptive_fill_line_spacing(*this);
if ((adaptive_line_spacing == 0. && support_line_spacing == 0.) || this->layers().empty())
return std::make_pair(OctreePtr(), OctreePtr());
indexed_triangle_set mesh = this->model_object()->raw_indexed_triangle_set();
// Rotate mesh and build octree on it with axis-aligned (standart base) cubes.
auto to_octree = transform_to_octree().toRotationMatrix();
its_transform(mesh, to_octree * this->trafo_centered(), true);
// Triangulate internal bridging surfaces.
std::vector<std::vector<Vec3d>> overhangs(this->layers().size());
tbb::parallel_for(
tbb::blocked_range<int>(0, int(m_layers.size()) - 1),
[this, &to_octree, &overhangs](const tbb::blocked_range<int> &range) {
std::vector<Vec3d> &out = overhangs[range.begin()];
for (int idx_layer = range.begin(); idx_layer < range.end(); ++ idx_layer) {
m_print->throw_if_canceled();
const Layer *layer = this->layers()[idx_layer];
for (const LayerRegion *layerm : layer->regions())
for (const Surface &surface : layerm->fill_surfaces.surfaces)
if (surface.surface_type == stInternalBridge)
append(out, triangulate_expolygon_3d(surface.expolygon, layer->bottom_z()));
}
for (Vec3d &p : out)
p = (to_octree * p).eval();
});
// and gather them.
for (size_t i = 1; i < overhangs.size(); ++ i)
append(overhangs.front(), std::move(overhangs[i]));
return std::make_pair(
adaptive_line_spacing ? build_octree(mesh, overhangs.front(), adaptive_line_spacing, false) : OctreePtr(),
support_line_spacing ? build_octree(mesh, overhangs.front(), support_line_spacing, true) : OctreePtr());
}
FillLightning::GeneratorPtr PrintObject::prepare_lightning_infill_data()
{
bool has_lightning_infill = false;
coordf_t lightning_density = 0.;
size_t lightning_cnt = 0;
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++region_id)
if (const PrintRegionConfig &config = this->printing_region(region_id).config(); config.fill_density > 0 && config.fill_pattern == ipLightning) {
has_lightning_infill = true;
lightning_density += config.fill_density;
++lightning_cnt;
}
if (has_lightning_infill)
lightning_density /= coordf_t(lightning_cnt);
return has_lightning_infill ? FillLightning::build_generator(std::as_const(*this), lightning_density, [this]() -> void { this->throw_if_canceled(); }) : FillLightning::GeneratorPtr();
}
void PrintObject::clear_layers()
{
for (Layer *l : m_layers)
delete l;
m_layers.clear();
}
Layer* PrintObject::add_layer(int id, coordf_t height, coordf_t print_z, coordf_t slice_z)
{
m_layers.emplace_back(new Layer(id, this, height, print_z, slice_z));
return m_layers.back();
}
void PrintObject::clear_support_layers()
{
for (Layer *l : m_support_layers)
delete l;
m_support_layers.clear();
}
SupportLayer* PrintObject::add_support_layer(int id, int interface_id, coordf_t height, coordf_t print_z)
{
m_support_layers.emplace_back(new SupportLayer(id, interface_id, this, height, print_z, -1));
return m_support_layers.back();
}
SupportLayerPtrs::iterator PrintObject::insert_support_layer(SupportLayerPtrs::iterator pos, size_t id, size_t interface_id, coordf_t height, coordf_t print_z, coordf_t slice_z)
{
return m_support_layers.insert(pos, new SupportLayer(id, interface_id, this, height, print_z, slice_z));
}
// Called by Print::apply().
// This method only accepts PrintObjectConfig and PrintRegionConfig option keys.
bool PrintObject::invalidate_state_by_config_options(
const ConfigOptionResolver &old_config, const ConfigOptionResolver &new_config, const std::vector<t_config_option_key> &opt_keys)
{
if (opt_keys.empty())
return false;
std::vector<PrintObjectStep> steps;
bool invalidated = false;
for (const t_config_option_key &opt_key : opt_keys) {
if ( opt_key == "brim_width"
|| opt_key == "brim_separation"
|| opt_key == "brim_type") {
// Brim is printed below supports, support invalidates brim and skirt.
steps.emplace_back(posSupportMaterial);
} else if (
opt_key == "perimeters"
|| opt_key == "extra_perimeters"
|| opt_key == "first_layer_extrusion_width"
|| opt_key == "perimeter_extrusion_width"
|| opt_key == "infill_overlap"
|| opt_key == "external_perimeters_first") {
steps.emplace_back(posPerimeters);
} else if (
opt_key == "gap_fill_enabled"
|| opt_key == "gap_fill_speed") {
// Return true if gap-fill speed has changed from zero value to non-zero or from non-zero value to zero.
auto is_gap_fill_changed_state_due_to_speed = [&opt_key, &old_config, &new_config]() -> bool {
if (opt_key == "gap_fill_speed") {
const auto *old_gap_fill_speed = old_config.option<ConfigOptionFloat>(opt_key);
const auto *new_gap_fill_speed = new_config.option<ConfigOptionFloat>(opt_key);
assert(old_gap_fill_speed && new_gap_fill_speed);
return (old_gap_fill_speed->value > 0.f && new_gap_fill_speed->value == 0.f) ||
(old_gap_fill_speed->value == 0.f && new_gap_fill_speed->value > 0.f);
}
return false;
};
// Filtering of unprintable regions in multi-material segmentation depends on if gap-fill is enabled or not.
// So step posSlice is invalidated when gap-fill was enabled/disabled by option "gap_fill_enabled" or by
// changing "gap_fill_speed" to force recomputation of the multi-material segmentation.
if (this->is_mm_painted() && (opt_key == "gap_fill_enabled" || (opt_key == "gap_fill_speed" && is_gap_fill_changed_state_due_to_speed())))
steps.emplace_back(posSlice);
steps.emplace_back(posPerimeters);
} else if (
opt_key == "layer_height"
|| opt_key == "mmu_segmented_region_max_width"
|| opt_key == "raft_layers"
|| opt_key == "raft_contact_distance"
|| opt_key == "slice_closing_radius"
|| opt_key == "slicing_mode") {
steps.emplace_back(posSlice);
} else if (
opt_key == "clip_multipart_objects"
|| opt_key == "elefant_foot_compensation"
|| opt_key == "support_material_contact_distance"
|| opt_key == "xy_size_compensation") {
steps.emplace_back(posSlice);
} else if (opt_key == "support_material") {
steps.emplace_back(posSupportMaterial);
if (m_config.support_material_contact_distance == 0.) {
// Enabling / disabling supports while soluble support interface is enabled.
// This changes the bridging logic (bridging enabled without supports, disabled with supports).
// Reset everything.
// See GH #1482 for details.
steps.emplace_back(posSlice);
}
} else if (
opt_key == "support_material_auto"
|| opt_key == "support_material_angle"
|| opt_key == "support_material_buildplate_only"
|| opt_key == "support_material_enforce_layers"
|| opt_key == "support_material_extruder"
|| opt_key == "support_material_extrusion_width"
|| opt_key == "support_material_bottom_contact_distance"
|| opt_key == "support_material_interface_layers"
|| opt_key == "support_material_bottom_interface_layers"
|| opt_key == "support_material_interface_pattern"
|| opt_key == "support_material_interface_contact_loops"
|| opt_key == "support_material_interface_extruder"
|| opt_key == "support_material_interface_spacing"
|| opt_key == "support_material_pattern"
|| opt_key == "support_material_style"
|| opt_key == "support_material_xy_spacing"
|| opt_key == "support_material_spacing"
|| opt_key == "support_material_closing_radius"
|| opt_key == "support_material_synchronize_layers"
|| opt_key == "support_material_threshold"
|| opt_key == "support_material_with_sheath"
|| opt_key == "raft_expansion"
|| opt_key == "raft_first_layer_density"
|| opt_key == "raft_first_layer_expansion"
|| opt_key == "dont_support_bridges"
|| opt_key == "first_layer_extrusion_width") {
steps.emplace_back(posSupportMaterial);
} else if (opt_key == "bottom_solid_layers") {
steps.emplace_back(posPrepareInfill);
if (m_print->config().spiral_vase) {
// Changing the number of bottom layers when a spiral vase is enabled requires re-slicing the object again.
// Otherwise, holes in the bottom layers could be filled, as is reported in GH #5528.
steps.emplace_back(posSlice);
}
} else if (
opt_key == "interface_shells"
|| opt_key == "infill_only_where_needed"
|| opt_key == "infill_every_layers"
|| opt_key == "solid_infill_every_layers"
|| opt_key == "bottom_solid_min_thickness"
|| opt_key == "top_solid_layers"
|| opt_key == "top_solid_min_thickness"
|| opt_key == "solid_infill_below_area"
|| opt_key == "infill_extruder"
|| opt_key == "solid_infill_extruder"
|| opt_key == "infill_extrusion_width"
|| opt_key == "ensure_vertical_shell_thickness"
|| opt_key == "bridge_angle") {
steps.emplace_back(posPrepareInfill);
} else if (
opt_key == "top_fill_pattern"
|| opt_key == "bottom_fill_pattern"
|| opt_key == "external_fill_link_max_length"
|| opt_key == "fill_angle"
|| opt_key == "infill_anchor"
|| opt_key == "infill_anchor_max"
|| opt_key == "top_infill_extrusion_width"
|| opt_key == "first_layer_extrusion_width") {
steps.emplace_back(posInfill);
} else if (opt_key == "fill_pattern") {
steps.emplace_back(posInfill);
const auto *old_fill_pattern = old_config.option<ConfigOptionEnum<InfillPattern>>(opt_key);
const auto *new_fill_pattern = new_config.option<ConfigOptionEnum<InfillPattern>>(opt_key);
assert(old_fill_pattern && new_fill_pattern);
// We need to recalculate infill surfaces when infill_only_where_needed is enabled, and we are switching from
// the Lightning infill to another infill or vice versa.
if (m_config.infill_only_where_needed && (new_fill_pattern->value == ipLightning || old_fill_pattern->value == ipLightning))
steps.emplace_back(posPrepareInfill);
} else if (opt_key == "fill_density") {
// One likely wants to reslice only when switching between zero infill to simulate boolean difference (subtracting volumes),
// normal infill and 100% (solid) infill.
const auto *old_density = old_config.option<ConfigOptionPercent>(opt_key);
const auto *new_density = new_config.option<ConfigOptionPercent>(opt_key);
assert(old_density && new_density);
//FIXME Vojtech is not quite sure about the 100% here, maybe it is not needed.
if (is_approx(old_density->value, 0.) || is_approx(old_density->value, 100.) ||
is_approx(new_density->value, 0.) || is_approx(new_density->value, 100.))
steps.emplace_back(posPerimeters);
steps.emplace_back(posPrepareInfill);
} else if (opt_key == "solid_infill_extrusion_width") {
// This value is used for calculating perimeter - infill overlap, thus perimeters need to be recalculated.
steps.emplace_back(posPerimeters);
steps.emplace_back(posPrepareInfill);
} else if (
opt_key == "external_perimeter_extrusion_width"
|| opt_key == "perimeter_extruder"
|| opt_key == "fuzzy_skin"
|| opt_key == "fuzzy_skin_thickness"
|| opt_key == "fuzzy_skin_point_dist"
|| opt_key == "overhangs"
|| opt_key == "thin_walls"
|| opt_key == "thick_bridges") {
steps.emplace_back(posPerimeters);
steps.emplace_back(posSupportMaterial);
} else if (opt_key == "bridge_flow_ratio") {
if (m_config.support_material_contact_distance > 0.) {
// Only invalidate due to bridging if bridging is enabled.
// If later "support_material_contact_distance" is modified, the complete PrintObject is invalidated anyway.
steps.emplace_back(posPerimeters);
steps.emplace_back(posInfill);
steps.emplace_back(posSupportMaterial);
}
} else if (
opt_key == "perimeter_generator"
|| opt_key == "wall_transition_length"
|| opt_key == "wall_transition_filter_deviation"
|| opt_key == "wall_transition_angle"
|| opt_key == "wall_distribution_count"
|| opt_key == "min_feature_size"
|| opt_key == "min_bead_width") {
steps.emplace_back(posSlice);
} else if (
opt_key == "seam_position"
|| opt_key == "seam_preferred_direction"
|| opt_key == "seam_preferred_direction_jitter"
|| opt_key == "support_material_speed"
|| opt_key == "support_material_interface_speed"
|| opt_key == "bridge_speed"
|| opt_key == "external_perimeter_speed"
|| opt_key == "infill_speed"
|| opt_key == "perimeter_speed"
|| opt_key == "small_perimeter_speed"
|| opt_key == "solid_infill_speed"
|| opt_key == "top_solid_infill_speed") {
invalidated |= m_print->invalidate_step(psGCodeExport);
} else if (
opt_key == "wipe_into_infill"
|| opt_key == "wipe_into_objects") {
invalidated |= m_print->invalidate_step(psWipeTower);
invalidated |= m_print->invalidate_step(psGCodeExport);
} else {
// for legacy, if we can't handle this option let's invalidate all steps
this->invalidate_all_steps();
invalidated = true;
}
}
sort_remove_duplicates(steps);
for (PrintObjectStep step : steps)
invalidated |= this->invalidate_step(step);
return invalidated;
}
bool PrintObject::invalidate_step(PrintObjectStep step)
{
bool invalidated = Inherited::invalidate_step(step);
// propagate to dependent steps
if (step == posPerimeters) {
invalidated |= this->invalidate_steps({ posPrepareInfill, posInfill, posIroning });
invalidated |= m_print->invalidate_steps({ psSkirtBrim });
} else if (step == posPrepareInfill) {
invalidated |= this->invalidate_steps({ posInfill, posIroning });
} else if (step == posInfill) {
invalidated |= this->invalidate_steps({ posIroning });
invalidated |= m_print->invalidate_steps({ psSkirtBrim });
} else if (step == posSlice) {
invalidated |= this->invalidate_steps({ posPerimeters, posPrepareInfill, posInfill, posIroning, posSupportMaterial });
invalidated |= m_print->invalidate_steps({ psSkirtBrim });
m_slicing_params.valid = false;
} else if (step == posSupportMaterial) {
invalidated |= m_print->invalidate_steps({ psSkirtBrim });
m_slicing_params.valid = false;
}
// Wipe tower depends on the ordering of extruders, which in turn depends on everything.
// It also decides about what the wipe_into_infill / wipe_into_object features will do,
// and that too depends on many of the settings.
invalidated |= m_print->invalidate_step(psWipeTower);
// Invalidate G-code export in any case.
invalidated |= m_print->invalidate_step(psGCodeExport);
return invalidated;
}
bool PrintObject::invalidate_all_steps()
{
// First call the "invalidate" functions, which may cancel background processing.
bool result = Inherited::invalidate_all_steps() | m_print->invalidate_all_steps();
// Then reset some of the depending values.
m_slicing_params.valid = false;
return result;
}
// This function analyzes slices of a region (SurfaceCollection slices).
// Each region slice (instance of Surface) is analyzed, whether it is supported or whether it is the top surface.
// Initially all slices are of type stInternal.
// Slices are compared against the top / bottom slices and regions and classified to the following groups:
// stTop - Part of a region, which is not covered by any upper layer. This surface will be filled with a top solid infill.
// stBottomBridge - Part of a region, which is not fully supported, but it hangs in the air, or it hangs losely on a support or a raft.
// stBottom - Part of a region, which is not supported by the same region, but it is supported either by another region, or by a soluble interface layer.
// stInternal - Part of a region, which is supported by the same region type.
// If a part of a region is of stBottom and stTop, the stBottom wins.
void PrintObject::detect_surfaces_type()
{
BOOST_LOG_TRIVIAL(info) << "Detecting solid surfaces..." << log_memory_info();
// Interface shells: the intersecting parts are treated as self standing objects supporting each other.
// Each of the objects will have a full number of top / bottom layers, even if these top / bottom layers
// are completely hidden inside a collective body of intersecting parts.
// This is useful if one of the parts is to be dissolved, or if it is transparent and the internal shells
// should be visible.
bool spiral_vase = this->print()->config().spiral_vase.value;
bool interface_shells = ! spiral_vase && m_config.interface_shells.value;
size_t num_layers = spiral_vase ? std::min(size_t(this->printing_region(0).config().bottom_solid_layers), m_layers.size()) : m_layers.size();
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++ region_id) {
BOOST_LOG_TRIVIAL(debug) << "Detecting solid surfaces for region " << region_id << " in parallel - start";
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
for (Layer *layer : m_layers)
layer->m_regions[region_id]->export_region_fill_surfaces_to_svg_debug("1_detect_surfaces_type-initial");
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
// If interface shells are allowed, the region->surfaces cannot be overwritten as they may be used by other threads.
// Cache the result of the following parallel_loop.
std::vector<Surfaces> surfaces_new;
if (interface_shells)
surfaces_new.assign(num_layers, Surfaces());
tbb::parallel_for(
tbb::blocked_range<size_t>(0,
spiral_vase ?
// In spiral vase mode, reserve the last layer for the top surface if more than 1 layer is planned for the vase bottom.
((num_layers > 1) ? num_layers - 1 : num_layers) :
// In non-spiral vase mode, go over all layers.
m_layers.size()),
[this, region_id, interface_shells, &surfaces_new](const tbb::blocked_range<size_t>& range) {
// If we have soluble support material, don't bridge. The overhang will be squished against a soluble layer separating
// the support from the print.
SurfaceType surface_type_bottom_other =
(this->has_support() && m_config.support_material_contact_distance.value == 0) ?
stBottom : stBottomBridge;
for (size_t idx_layer = range.begin(); idx_layer < range.end(); ++ idx_layer) {
m_print->throw_if_canceled();
// BOOST_LOG_TRIVIAL(trace) << "Detecting solid surfaces for region " << region_id << " and layer " << layer->print_z;
Layer *layer = m_layers[idx_layer];
LayerRegion *layerm = layer->m_regions[region_id];
// comparison happens against the *full* slices (considering all regions)
// unless internal shells are requested
Layer *upper_layer = (idx_layer + 1 < this->layer_count()) ? m_layers[idx_layer + 1] : nullptr;
Layer *lower_layer = (idx_layer > 0) ? m_layers[idx_layer - 1] : nullptr;
// collapse very narrow parts (using the safety offset in the diff is not enough)
float offset = layerm->flow(frExternalPerimeter).scaled_width() / 10.f;
// find top surfaces (difference between current surfaces
// of current layer and upper one)
Surfaces top;
if (upper_layer) {
ExPolygons upper_slices = interface_shells ?
diff_ex(layerm->slices.surfaces, upper_layer->m_regions[region_id]->slices.surfaces, ApplySafetyOffset::Yes) :
diff_ex(layerm->slices.surfaces, upper_layer->lslices, ApplySafetyOffset::Yes);
surfaces_append(top, opening_ex(upper_slices, offset), stTop);
} else {
// if no upper layer, all surfaces of this one are solid
// we clone surfaces because we're going to clear the slices collection
top = layerm->slices.surfaces;
for (Surface &surface : top)
surface.surface_type = stTop;
}
// Find bottom surfaces (difference between current surfaces of current layer and lower one).
Surfaces bottom;
if (lower_layer) {
#if 0
//FIXME Why is this branch failing t\multi.t ?
Polygons lower_slices = interface_shells ?
to_polygons(lower_layer->get_region(region_id)->slices.surfaces) :
to_polygons(lower_layer->slices);
surfaces_append(bottom,
opening_ex(diff(layerm->slices.surfaces, lower_slices, true), offset),
surface_type_bottom_other);
#else
// Any surface lying on the void is a true bottom bridge (an overhang)
surfaces_append(
bottom,
opening_ex(
diff_ex(layerm->slices.surfaces, lower_layer->lslices, ApplySafetyOffset::Yes),
offset),
surface_type_bottom_other);
// if user requested internal shells, we need to identify surfaces
// lying on other slices not belonging to this region
if (interface_shells) {
// non-bridging bottom surfaces: any part of this layer lying
// on something else, excluding those lying on our own region
surfaces_append(
bottom,
opening_ex(
diff_ex(
intersection(layerm->slices.surfaces, lower_layer->lslices), // supported
lower_layer->m_regions[region_id]->slices.surfaces,
ApplySafetyOffset::Yes),
offset),
stBottom);
}
#endif
} else {
// if no lower layer, all surfaces of this one are solid
// we clone surfaces because we're going to clear the slices collection
bottom = layerm->slices.surfaces;
for (Surface &surface : bottom)
surface.surface_type = stBottom;
}
// now, if the object contained a thin membrane, we could have overlapping bottom
// and top surfaces; let's do an intersection to discover them and consider them
// as bottom surfaces (to allow for bridge detection)
if (! top.empty() && ! bottom.empty()) {
// Polygons overlapping = intersection(to_polygons(top), to_polygons(bottom));
// Slic3r::debugf " layer %d contains %d membrane(s)\n", $layerm->layer->id, scalar(@$overlapping)
// if $Slic3r::debug;
Polygons top_polygons = to_polygons(std::move(top));
top.clear();
surfaces_append(top, diff_ex(top_polygons, bottom), stTop);
}
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
{
static int iRun = 0;
std::vector<std::pair<Slic3r::ExPolygons, SVG::ExPolygonAttributes>> expolygons_with_attributes;
expolygons_with_attributes.emplace_back(std::make_pair(union_ex(top), SVG::ExPolygonAttributes("green")));
expolygons_with_attributes.emplace_back(std::make_pair(union_ex(bottom), SVG::ExPolygonAttributes("brown")));
expolygons_with_attributes.emplace_back(std::make_pair(to_expolygons(layerm->slices.surfaces), SVG::ExPolygonAttributes("black")));
SVG::export_expolygons(debug_out_path("1_detect_surfaces_type_%d_region%d-layer_%f.svg", iRun ++, region_id, layer->print_z).c_str(), expolygons_with_attributes);
}
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
// save surfaces to layer
Surfaces &surfaces_out = interface_shells ? surfaces_new[idx_layer] : layerm->slices.surfaces;
Surfaces surfaces_backup;
if (! interface_shells) {
surfaces_backup = std::move(surfaces_out);
surfaces_out.clear();
}
const Surfaces &surfaces_prev = interface_shells ? layerm->slices.surfaces : surfaces_backup;
// find internal surfaces (difference between top/bottom surfaces and others)
{
Polygons topbottom = to_polygons(top);
polygons_append(topbottom, to_polygons(bottom));
surfaces_append(surfaces_out, diff_ex(surfaces_prev, topbottom), stInternal);
}
surfaces_append(surfaces_out, std::move(top));
surfaces_append(surfaces_out, std::move(bottom));
// Slic3r::debugf " layer %d has %d bottom, %d top and %d internal surfaces\n",
// $layerm->layer->id, scalar(@bottom), scalar(@top), scalar(@internal) if $Slic3r::debug;
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
layerm->export_region_slices_to_svg_debug("detect_surfaces_type-final");
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
}
}
); // for each layer of a region
m_print->throw_if_canceled();
if (interface_shells) {
// Move surfaces_new to layerm->slices.surfaces
for (size_t idx_layer = 0; idx_layer < num_layers; ++ idx_layer)
m_layers[idx_layer]->m_regions[region_id]->slices.surfaces = std::move(surfaces_new[idx_layer]);
}
if (spiral_vase) {
if (num_layers > 1)
// Turn the last bottom layer infill to a top infill, so it will be extruded with a proper pattern.
m_layers[num_layers - 1]->m_regions[region_id]->slices.set_type(stTop);
for (size_t i = num_layers; i < m_layers.size(); ++ i)
m_layers[i]->m_regions[region_id]->slices.set_type(stInternal);
}
BOOST_LOG_TRIVIAL(debug) << "Detecting solid surfaces for region " << region_id << " - clipping in parallel - start";
// Fill in layerm->fill_surfaces by trimming the layerm->slices by the cummulative layerm->fill_surfaces.
tbb::parallel_for(
tbb::blocked_range<size_t>(0, m_layers.size()),
[this, region_id](const tbb::blocked_range<size_t>& range) {
for (size_t idx_layer = range.begin(); idx_layer < range.end(); ++ idx_layer) {
m_print->throw_if_canceled();
LayerRegion *layerm = m_layers[idx_layer]->m_regions[region_id];
layerm->slices_to_fill_surfaces_clipped();
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
layerm->export_region_fill_surfaces_to_svg_debug("1_detect_surfaces_type-final");
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
} // for each layer of a region
});
m_print->throw_if_canceled();
BOOST_LOG_TRIVIAL(debug) << "Detecting solid surfaces for region " << region_id << " - clipping in parallel - end";
} // for each this->print->region_count
// Mark the object to have the region slices classified (typed, which also means they are split based on whether they are supported, bridging, top layers etc.)
m_typed_slices = true;
}
void PrintObject::process_external_surfaces()
{
BOOST_LOG_TRIVIAL(info) << "Processing external surfaces..." << log_memory_info();
// Cached surfaces covered by some extrusion, defining regions, over which the from the surfaces one layer higher are allowed to expand.
std::vector<Polygons> surfaces_covered;
// Is there any printing region, that has zero infill? If so, then we don't want the expansion to be performed over the complete voids, but only
// over voids, which are supported by the layer below.
bool has_voids = false;
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++ region_id)
if (this->printing_region(region_id).config().fill_density == 0) {
has_voids = true;
break;
}
if (has_voids && m_layers.size() > 1) {
// All but stInternal fill surfaces will get expanded and possibly trimmed.
std::vector<unsigned char> layer_expansions_and_voids(m_layers.size(), false);
for (size_t layer_idx = 0; layer_idx < m_layers.size(); ++ layer_idx) {
const Layer *layer = m_layers[layer_idx];
bool expansions = false;
bool voids = false;
for (const LayerRegion *layerm : layer->regions()) {
for (const Surface &surface : layerm->fill_surfaces.surfaces) {
if (surface.surface_type == stInternal)
voids = true;
else
expansions = true;
if (voids && expansions) {
layer_expansions_and_voids[layer_idx] = true;
goto end;
}
}
}
end:;
}
BOOST_LOG_TRIVIAL(debug) << "Collecting surfaces covered with extrusions in parallel - start";
surfaces_covered.resize(m_layers.size() - 1, Polygons());
auto unsupported_width = - float(scale_(0.3 * EXTERNAL_INFILL_MARGIN));
tbb::parallel_for(
tbb::blocked_range<size_t>(0, m_layers.size() - 1),
[this, &surfaces_covered, &layer_expansions_and_voids, unsupported_width](const tbb::blocked_range<size_t>& range) {
for (size_t layer_idx = range.begin(); layer_idx < range.end(); ++ layer_idx)
if (layer_expansions_and_voids[layer_idx + 1]) {
m_print->throw_if_canceled();
Polygons voids;
for (const LayerRegion *layerm : m_layers[layer_idx]->regions()) {
if (layerm->region().config().fill_density.value == 0.)
for (const Surface &surface : layerm->fill_surfaces.surfaces)
// Shrink the holes, let the layer above expand slightly inside the unsupported areas.
polygons_append(voids, offset(surface.expolygon, unsupported_width));
}
surfaces_covered[layer_idx] = diff(m_layers[layer_idx]->lslices, voids);
}
}
);
m_print->throw_if_canceled();
BOOST_LOG_TRIVIAL(debug) << "Collecting surfaces covered with extrusions in parallel - end";
}
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++region_id) {
BOOST_LOG_TRIVIAL(debug) << "Processing external surfaces for region " << region_id << " in parallel - start";
tbb::parallel_for(
tbb::blocked_range<size_t>(0, m_layers.size()),
[this, &surfaces_covered, region_id](const tbb::blocked_range<size_t>& range) {
for (size_t layer_idx = range.begin(); layer_idx < range.end(); ++ layer_idx) {
m_print->throw_if_canceled();
// BOOST_LOG_TRIVIAL(trace) << "Processing external surface, layer" << m_layers[layer_idx]->print_z;
m_layers[layer_idx]->get_region(int(region_id))->process_external_surfaces(
(layer_idx == 0) ? nullptr : m_layers[layer_idx - 1],
(layer_idx == 0 || surfaces_covered.empty() || surfaces_covered[layer_idx - 1].empty()) ? nullptr : &surfaces_covered[layer_idx - 1]);
}
}
);
m_print->throw_if_canceled();
BOOST_LOG_TRIVIAL(debug) << "Processing external surfaces for region " << region_id << " in parallel - end";
}
}
void PrintObject::discover_vertical_shells()
{
BOOST_LOG_TRIVIAL(info) << "Discovering vertical shells..." << log_memory_info();
struct DiscoverVerticalShellsCacheEntry
{
// Collected polygons, offsetted
Polygons top_surfaces;
Polygons bottom_surfaces;
Polygons holes;
};
bool spiral_vase = this->print()->config().spiral_vase.value;
size_t num_layers = spiral_vase ? std::min(size_t(this->printing_region(0).config().bottom_solid_layers), m_layers.size()) : m_layers.size();
coordf_t min_layer_height = this->slicing_parameters().min_layer_height;
// Does this region possibly produce more than 1 top or bottom layer?
auto has_extra_layers_fn = [min_layer_height](const PrintRegionConfig &config) {
auto num_extra_layers = [min_layer_height](int num_solid_layers, coordf_t min_shell_thickness) {
if (num_solid_layers == 0)
return 0;
int n = num_solid_layers - 1;
int n2 = int(ceil(min_shell_thickness / min_layer_height));
return std::max(n, n2 - 1);
};
return num_extra_layers(config.top_solid_layers, config.top_solid_min_thickness) +
num_extra_layers(config.bottom_solid_layers, config.bottom_solid_min_thickness) > 0;
};
std::vector<DiscoverVerticalShellsCacheEntry> cache_top_botom_regions(num_layers, DiscoverVerticalShellsCacheEntry());
bool top_bottom_surfaces_all_regions = this->num_printing_regions() > 1 && ! m_config.interface_shells.value;
if (top_bottom_surfaces_all_regions) {
// This is a multi-material print and interface_shells are disabled, meaning that the vertical shell thickness
// is calculated over all materials.
// Is the "ensure vertical wall thickness" applicable to any region?
bool has_extra_layers = false;
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++region_id) {
const PrintRegionConfig &config = this->printing_region(region_id).config();
if (config.ensure_vertical_shell_thickness.value && has_extra_layers_fn(config)) {
has_extra_layers = true;
break;
}
}
if (! has_extra_layers)
// The "ensure vertical wall thickness" feature is not applicable to any of the regions. Quit.
return;
BOOST_LOG_TRIVIAL(debug) << "Discovering vertical shells in parallel - start : cache top / bottom";
//FIXME Improve the heuristics for a grain size.
size_t grain_size = std::max(num_layers / 16, size_t(1));
tbb::parallel_for(
tbb::blocked_range<size_t>(0, num_layers, grain_size),
[this, &cache_top_botom_regions](const tbb::blocked_range<size_t>& range) {
const SurfaceType surfaces_bottom[2] = { stBottom, stBottomBridge };
const size_t num_regions = this->num_printing_regions();
for (size_t idx_layer = range.begin(); idx_layer < range.end(); ++ idx_layer) {
m_print->throw_if_canceled();
const Layer &layer = *m_layers[idx_layer];
DiscoverVerticalShellsCacheEntry &cache = cache_top_botom_regions[idx_layer];
// Simulate single set of perimeters over all merged regions.
float perimeter_offset = 0.f;
float perimeter_min_spacing = FLT_MAX;
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
static size_t debug_idx = 0;
++ debug_idx;
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
for (size_t region_id = 0; region_id < num_regions; ++ region_id) {
LayerRegion &layerm = *layer.m_regions[region_id];
float min_perimeter_infill_spacing = float(layerm.flow(frSolidInfill).scaled_spacing()) * 1.05f;
// Top surfaces.
append(cache.top_surfaces, offset(layerm.slices.filter_by_type(stTop), min_perimeter_infill_spacing));
append(cache.top_surfaces, offset(layerm.fill_surfaces.filter_by_type(stTop), min_perimeter_infill_spacing));
// Bottom surfaces.
append(cache.bottom_surfaces, offset(layerm.slices.filter_by_types(surfaces_bottom, 2), min_perimeter_infill_spacing));
append(cache.bottom_surfaces, offset(layerm.fill_surfaces.filter_by_types(surfaces_bottom, 2), min_perimeter_infill_spacing));
// Calculate the maximum perimeter offset as if the slice was extruded with a single extruder only.
// First find the maxium number of perimeters per region slice.
unsigned int perimeters = 0;
for (Surface &s : layerm.slices.surfaces)
perimeters = std::max<unsigned int>(perimeters, s.extra_perimeters);
perimeters += layerm.region().config().perimeters.value;
// Then calculate the infill offset.
if (perimeters > 0) {
Flow extflow = layerm.flow(frExternalPerimeter);
Flow flow = layerm.flow(frPerimeter);
perimeter_offset = std::max(perimeter_offset,
0.5f * float(extflow.scaled_width() + extflow.scaled_spacing()) + (float(perimeters) - 1.f) * flow.scaled_spacing());
perimeter_min_spacing = std::min(perimeter_min_spacing, float(std::min(extflow.scaled_spacing(), flow.scaled_spacing())));
}
polygons_append(cache.holes, to_polygons(layerm.fill_expolygons));
}
// Save some computing time by reducing the number of polygons.
cache.top_surfaces = union_(cache.top_surfaces);
cache.bottom_surfaces = union_(cache.bottom_surfaces);
// For a multi-material print, simulate perimeter / infill split as if only a single extruder has been used for the whole print.
if (perimeter_offset > 0.) {
// The layer.lslices are forced to merge by expanding them first.
polygons_append(cache.holes, offset2(layer.lslices, 0.3f * perimeter_min_spacing, - perimeter_offset - 0.3f * perimeter_min_spacing));
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
{
Slic3r::SVG svg(debug_out_path("discover_vertical_shells-extra-holes-%d.svg", debug_idx), get_extents(layer.lslices));
svg.draw(layer.lslices, "blue");
svg.draw(union_ex(cache.holes), "red");
svg.draw_outline(union_ex(cache.holes), "black", "blue", scale_(0.05));
svg.Close();
}
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
}
cache.holes = union_(cache.holes);
}
});
m_print->throw_if_canceled();
BOOST_LOG_TRIVIAL(debug) << "Discovering vertical shells in parallel - end : cache top / bottom";
}
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++ region_id) {
const PrintRegion &region = this->printing_region(region_id);
if (! region.config().ensure_vertical_shell_thickness.value)
// This region will be handled by discover_horizontal_shells().
continue;
if (! has_extra_layers_fn(region.config()))
// Zero or 1 layer, there is no additional vertical wall thickness enforced.
continue;
//FIXME Improve the heuristics for a grain size.
size_t grain_size = std::max(num_layers / 16, size_t(1));
if (! top_bottom_surfaces_all_regions) {
// This is either a single material print, or a multi-material print and interface_shells are enabled, meaning that the vertical shell thickness
// is calculated over a single material.
BOOST_LOG_TRIVIAL(debug) << "Discovering vertical shells for region " << region_id << " in parallel - start : cache top / bottom";
tbb::parallel_for(
tbb::blocked_range<size_t>(0, num_layers, grain_size),
[this, region_id, &cache_top_botom_regions](const tbb::blocked_range<size_t>& range) {
const SurfaceType surfaces_bottom[2] = { stBottom, stBottomBridge };
for (size_t idx_layer = range.begin(); idx_layer < range.end(); ++ idx_layer) {
m_print->throw_if_canceled();
Layer &layer = *m_layers[idx_layer];
LayerRegion &layerm = *layer.m_regions[region_id];
float min_perimeter_infill_spacing = float(layerm.flow(frSolidInfill).scaled_spacing()) * 1.05f;
// Top surfaces.
auto &cache = cache_top_botom_regions[idx_layer];
cache.top_surfaces = offset(layerm.slices.filter_by_type(stTop), min_perimeter_infill_spacing);
append(cache.top_surfaces, offset(layerm.fill_surfaces.filter_by_type(stTop), min_perimeter_infill_spacing));
// Bottom surfaces.
cache.bottom_surfaces = offset(layerm.slices.filter_by_types(surfaces_bottom, 2), min_perimeter_infill_spacing);
append(cache.bottom_surfaces, offset(layerm.fill_surfaces.filter_by_types(surfaces_bottom, 2), min_perimeter_infill_spacing));
// Holes over all regions. Only collect them once, they are valid for all region_id iterations.
if (cache.holes.empty()) {
for (size_t region_id = 0; region_id < layer.regions().size(); ++ region_id)
polygons_append(cache.holes, to_polygons(layer.regions()[region_id]->fill_expolygons));
}
}
});
m_print->throw_if_canceled();
BOOST_LOG_TRIVIAL(debug) << "Discovering vertical shells for region " << region_id << " in parallel - end : cache top / bottom";
}
BOOST_LOG_TRIVIAL(debug) << "Discovering vertical shells for region " << region_id << " in parallel - start : ensure vertical wall thickness";
tbb::parallel_for(
tbb::blocked_range<size_t>(0, num_layers, grain_size),
[this, region_id, &cache_top_botom_regions]
(const tbb::blocked_range<size_t>& range) {
// printf("discover_vertical_shells from %d to %d\n", range.begin(), range.end());
for (size_t idx_layer = range.begin(); idx_layer < range.end(); ++ idx_layer) {
m_print->throw_if_canceled();
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
static size_t debug_idx = 0;
++ debug_idx;
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
Layer *layer = m_layers[idx_layer];
LayerRegion *layerm = layer->m_regions[region_id];
const PrintRegionConfig &region_config = layerm->region().config();
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
layerm->export_region_slices_to_svg_debug("4_discover_vertical_shells-initial");
layerm->export_region_fill_surfaces_to_svg_debug("4_discover_vertical_shells-initial");
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
Flow solid_infill_flow = layerm->flow(frSolidInfill);
coord_t infill_line_spacing = solid_infill_flow.scaled_spacing();
// Find a union of perimeters below / above this surface to guarantee a minimum shell thickness.
Polygons shell;
Polygons holes;
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
ExPolygons shell_ex;
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
float min_perimeter_infill_spacing = float(infill_line_spacing) * 1.05f;
#if 0
// #ifdef SLIC3R_DEBUG_SLICE_PROCESSING
{
Slic3r::SVG svg_cummulative(debug_out_path("discover_vertical_shells-perimeters-before-union-run%d.svg", debug_idx), this->bounding_box());
for (int n = (int)idx_layer - n_extra_bottom_layers; n <= (int)idx_layer + n_extra_top_layers; ++ n) {
if (n < 0 || n >= (int)m_layers.size())
continue;
ExPolygons &expolys = m_layers[n]->perimeter_expolygons;
for (size_t i = 0; i < expolys.size(); ++ i) {
Slic3r::SVG svg(debug_out_path("discover_vertical_shells-perimeters-before-union-run%d-layer%d-expoly%d.svg", debug_idx, n, i), get_extents(expolys[i]));
svg.draw(expolys[i]);
svg.draw_outline(expolys[i].contour, "black", scale_(0.05));
svg.draw_outline(expolys[i].holes, "blue", scale_(0.05));
svg.Close();
svg_cummulative.draw(expolys[i]);
svg_cummulative.draw_outline(expolys[i].contour, "black", scale_(0.05));
svg_cummulative.draw_outline(expolys[i].holes, "blue", scale_(0.05));
}
}
}
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
polygons_append(holes, cache_top_botom_regions[idx_layer].holes);
if (int n_top_layers = region_config.top_solid_layers.value; n_top_layers > 0) {
// Gather top regions projected to this layer.
coordf_t print_z = layer->print_z;
for (int i = int(idx_layer) + 1;
i < int(cache_top_botom_regions.size()) &&
(i < int(idx_layer) + n_top_layers ||
m_layers[i]->print_z - print_z < region_config.top_solid_min_thickness - EPSILON);
++ i) {
const DiscoverVerticalShellsCacheEntry &cache = cache_top_botom_regions[i];
if (! holes.empty())
holes = intersection(holes, cache.holes);
if (! cache.top_surfaces.empty()) {
polygons_append(shell, cache.top_surfaces);
// Running the union_ using the Clipper library piece by piece is cheaper
// than running the union_ all at once.
shell = union_(shell);
}
}
}
if (int n_bottom_layers = region_config.bottom_solid_layers.value; n_bottom_layers > 0) {
// Gather bottom regions projected to this layer.
coordf_t bottom_z = layer->bottom_z();
for (int i = int(idx_layer) - 1;
i >= 0 &&
(i > int(idx_layer) - n_bottom_layers ||
bottom_z - m_layers[i]->bottom_z() < region_config.bottom_solid_min_thickness - EPSILON);
-- i) {
const DiscoverVerticalShellsCacheEntry &cache = cache_top_botom_regions[i];
if (! holes.empty())
holes = intersection(holes, cache.holes);
if (! cache.bottom_surfaces.empty()) {
polygons_append(shell, cache.bottom_surfaces);
// Running the union_ using the Clipper library piece by piece is cheaper
// than running the union_ all at once.
shell = union_(shell);
}
}
}
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
{
Slic3r::SVG svg(debug_out_path("discover_vertical_shells-perimeters-before-union-%d.svg", debug_idx), get_extents(shell));
svg.draw(shell);
svg.draw_outline(shell, "black", scale_(0.05));
svg.Close();
}
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
#if 0
// shell = union_(shell, true);
shell = union_(shell, false);
#endif
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
shell_ex = union_safety_offset_ex(shell);
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
//if (shell.empty())
// continue;
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
{
Slic3r::SVG svg(debug_out_path("discover_vertical_shells-perimeters-after-union-%d.svg", debug_idx), get_extents(shell));
svg.draw(shell_ex);
svg.draw_outline(shell_ex, "black", "blue", scale_(0.05));
svg.Close();
}
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
{
Slic3r::SVG svg(debug_out_path("discover_vertical_shells-internal-wshell-%d.svg", debug_idx), get_extents(shell));
svg.draw(layerm->fill_surfaces.filter_by_type(stInternal), "yellow", 0.5);
svg.draw_outline(layerm->fill_surfaces.filter_by_type(stInternal), "black", "blue", scale_(0.05));
svg.draw(shell_ex, "blue", 0.5);
svg.draw_outline(shell_ex, "black", "blue", scale_(0.05));
svg.Close();
}
{
Slic3r::SVG svg(debug_out_path("discover_vertical_shells-internalvoid-wshell-%d.svg", debug_idx), get_extents(shell));
svg.draw(layerm->fill_surfaces.filter_by_type(stInternalVoid), "yellow", 0.5);
svg.draw_outline(layerm->fill_surfaces.filter_by_type(stInternalVoid), "black", "blue", scale_(0.05));
svg.draw(shell_ex, "blue", 0.5);
svg.draw_outline(shell_ex, "black", "blue", scale_(0.05));
svg.Close();
}
{
Slic3r::SVG svg(debug_out_path("discover_vertical_shells-internalvoid-wshell-%d.svg", debug_idx), get_extents(shell));
svg.draw(layerm->fill_surfaces.filter_by_type(stInternalVoid), "yellow", 0.5);
svg.draw_outline(layerm->fill_surfaces.filter_by_type(stInternalVoid), "black", "blue", scale_(0.05));
svg.draw(shell_ex, "blue", 0.5);
svg.draw_outline(shell_ex, "black", "blue", scale_(0.05));
svg.Close();
}
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
// Trim the shells region by the internal & internal void surfaces.
const SurfaceType surfaceTypesInternal[] = { stInternal, stInternalVoid, stInternalSolid };
const Polygons polygonsInternal = to_polygons(layerm->fill_surfaces.filter_by_types(surfaceTypesInternal, 3));
shell = intersection(shell, polygonsInternal, ApplySafetyOffset::Yes);
polygons_append(shell, diff(polygonsInternal, holes));
if (shell.empty())
continue;
// Append the internal solids, so they will be merged with the new ones.
polygons_append(shell, to_polygons(layerm->fill_surfaces.filter_by_type(stInternalSolid)));
// These regions will be filled by a rectilinear full infill. Currently this type of infill
// only fills regions, which fit at least a single line. To avoid gaps in the sparse infill,
// make sure that this region does not contain parts narrower than the infill spacing width.
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
Polygons shell_before = shell;
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
#if 1
// Intentionally inflate a bit more than how much the region has been shrunk,
// so there will be some overlap between this solid infill and the other infill regions (mainly the sparse infill).
shell = opening(union_(shell), 0.5f * min_perimeter_infill_spacing, 0.8f * min_perimeter_infill_spacing, ClipperLib::jtSquare);
if (shell.empty())
continue;
#else
// Ensure each region is at least 3x infill line width wide, so it could be filled in.
// float margin = float(infill_line_spacing) * 3.f;
float margin = float(infill_line_spacing) * 1.5f;
// we use a higher miterLimit here to handle areas with acute angles
// in those cases, the default miterLimit would cut the corner and we'd
// get a triangle in $too_narrow; if we grow it below then the shell
// would have a different shape from the external surface and we'd still
// have the same angle, so the next shell would be grown even more and so on.
Polygons too_narrow = diff(shell, opening(shell, margin, ClipperLib::jtMiter, 5.), true);
if (! too_narrow.empty()) {
// grow the collapsing parts and add the extra area to the neighbor layer
// as well as to our original surfaces so that we support this
// additional area in the next shell too
// make sure our grown surfaces don't exceed the fill area
polygons_append(shell, intersection(offset(too_narrow, margin), polygonsInternal));
}
#endif
ExPolygons new_internal_solid = intersection_ex(polygonsInternal, shell);
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
{
Slic3r::SVG svg(debug_out_path("discover_vertical_shells-regularized-%d.svg", debug_idx), get_extents(shell_before));
// Source shell.
svg.draw(union_safety_offset_ex(shell_before));
// Shell trimmed to the internal surfaces.
svg.draw_outline(union_safety_offset_ex(shell), "black", "blue", scale_(0.05));
// Regularized infill region.
svg.draw_outline(new_internal_solid, "red", "magenta", scale_(0.05));
svg.Close();
}
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
// Trim the internal & internalvoid by the shell.
Slic3r::ExPolygons new_internal = diff_ex(layerm->fill_surfaces.filter_by_type(stInternal), shell);
Slic3r::ExPolygons new_internal_void = diff_ex(layerm->fill_surfaces.filter_by_type(stInternalVoid), shell);
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
{
SVG::export_expolygons(debug_out_path("discover_vertical_shells-new_internal-%d.svg", debug_idx), get_extents(shell), new_internal, "black", "blue", scale_(0.05));
SVG::export_expolygons(debug_out_path("discover_vertical_shells-new_internal_void-%d.svg", debug_idx), get_extents(shell), new_internal_void, "black", "blue", scale_(0.05));
SVG::export_expolygons(debug_out_path("discover_vertical_shells-new_internal_solid-%d.svg", debug_idx), get_extents(shell), new_internal_solid, "black", "blue", scale_(0.05));
}
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
// Assign resulting internal surfaces to layer.
const SurfaceType surfaceTypesKeep[] = { stTop, stBottom, stBottomBridge };
layerm->fill_surfaces.keep_types(surfaceTypesKeep, sizeof(surfaceTypesKeep)/sizeof(SurfaceType));
layerm->fill_surfaces.append(new_internal, stInternal);
layerm->fill_surfaces.append(new_internal_void, stInternalVoid);
layerm->fill_surfaces.append(new_internal_solid, stInternalSolid);
} // for each layer
});
m_print->throw_if_canceled();
BOOST_LOG_TRIVIAL(debug) << "Discovering vertical shells for region " << region_id << " in parallel - end";
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
for (size_t idx_layer = 0; idx_layer < m_layers.size(); ++idx_layer) {
LayerRegion *layerm = m_layers[idx_layer]->get_region(region_id);
layerm->export_region_slices_to_svg_debug("4_discover_vertical_shells-final");
layerm->export_region_fill_surfaces_to_svg_debug("4_discover_vertical_shells-final");
}
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
} // for each region
}
// This method applies bridge flow to the first internal solid layer above sparse infill.
void PrintObject::bridge_over_infill()
{
BOOST_LOG_TRIVIAL(info) << "Bridge over infill..." << log_memory_info();
std::vector<int> sparse_infill_regions;
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++ region_id)
if (const PrintRegion &region = this->printing_region(region_id); region.config().fill_density.value < 100)
sparse_infill_regions.emplace_back(region_id);
if (this->layer_count() < 2 || sparse_infill_regions.empty())
return;
// Collect sum of all internal (sparse infill) regions, because
// 1) layerm->fill_surfaces.will be modified in parallel.
// 2) the parallel loop works on a sum of surfaces over regions anyways, thus collecting the sparse infill surfaces
// up front is an optimization.
std::vector<Polygons> internals;
internals.reserve(this->layer_count());
for (Layer *layer : m_layers) {
Polygons sum;
for (const LayerRegion *layerm : layer->m_regions)
layerm->fill_surfaces.filter_by_type(stInternal, &sum);
internals.emplace_back(std::move(sum));
}
// Process all regions and layers in parallel.
tbb::parallel_for(tbb::blocked_range<size_t>(0, sparse_infill_regions.size() * (this->layer_count() - 1), sparse_infill_regions.size()),
[this, &sparse_infill_regions, &internals]
(const tbb::blocked_range<size_t> &range) {
for (size_t task_id = range.begin(); task_id != range.end(); ++ task_id) {
const size_t layer_id = (task_id / sparse_infill_regions.size()) + 1;
const size_t region_id = sparse_infill_regions[task_id % sparse_infill_regions.size()];
Layer *layer = this->get_layer(layer_id);
LayerRegion *layerm = layer->m_regions[region_id];
Flow bridge_flow = layerm->bridging_flow(frSolidInfill);
// Extract the stInternalSolid surfaces that might be transformed into bridges.
ExPolygons internal_solid;
layerm->fill_surfaces.remove_type(stInternalSolid, &internal_solid);
if (internal_solid.empty())
// No internal solid -> no new bridges for this layer region.
continue;
// check whether the lower area is deep enough for absorbing the extra flow
// (for obvious physical reasons but also for preventing the bridge extrudates
// from overflowing in 3D preview)
ExPolygons to_bridge;
{
Polygons to_bridge_pp = to_polygons(internal_solid);
// Iterate through lower layers spanned by bridge_flow.
double bottom_z = layer->print_z - bridge_flow.height() - EPSILON;
for (auto i = int(layer_id) - 1; i >= 0; -- i) {
// Stop iterating if layer is lower than bottom_z.
if (m_layers[i]->print_z < bottom_z)
break;
// Intersect lower sparse infills with the candidate solid surfaces.
to_bridge_pp = intersection(to_bridge_pp, internals[i]);
}
// there's no point in bridging too thin/short regions
//FIXME Vojtech: The offset2 function is not a geometric offset,
// therefore it may create 1) gaps, and 2) sharp corners, which are outside the original contour.
// The gaps will be filled by a separate region, which makes the infill less stable and it takes longer.
{
float min_width = float(bridge_flow.scaled_width()) * 3.f;
to_bridge_pp = opening(to_bridge_pp, min_width);
}
if (to_bridge_pp.empty()) {
// Restore internal_solid surfaces.
for (ExPolygon &ex : internal_solid)
layerm->fill_surfaces.surfaces.push_back(Surface(stInternalSolid, std::move(ex)));
continue;
}
// convert into ExPolygons
to_bridge = union_ex(to_bridge_pp);
}
#ifdef SLIC3R_DEBUG
printf("Bridging %zu internal areas at layer %zu\n", to_bridge.size(), layer->id());
#endif
// compute the remaning internal solid surfaces as difference
ExPolygons not_to_bridge = diff_ex(internal_solid, to_bridge, ApplySafetyOffset::Yes);
to_bridge = intersection_ex(to_bridge, internal_solid, ApplySafetyOffset::Yes);
// build the new collection of fill_surfaces
for (ExPolygon &ex : to_bridge)
layerm->fill_surfaces.surfaces.push_back(Surface(stInternalBridge, std::move(ex)));
for (ExPolygon &ex : not_to_bridge)
layerm->fill_surfaces.surfaces.push_back(Surface(stInternalSolid, std::move(ex)));
/*
# exclude infill from the layers below if needed
# see discussion at https://github.com/alexrj/Slic3r/issues/240
# Update: do not exclude any infill. Sparse infill is able to absorb the excess material.
if (0) {
my $excess = $layerm->extruders->{infill}->bridge_flow->width - $layerm->height;
for (my $i = $layer_id-1; $excess >= $self->get_layer($i)->height; $i--) {
Slic3r::debugf " skipping infill below those areas at layer %d\n", $i;
foreach my $lower_layerm (@{$self->get_layer($i)->regions}) {
my @new_surfaces = ();
# subtract the area from all types of surfaces
foreach my $group (@{$lower_layerm->fill_surfaces->group}) {
push @new_surfaces, map $group->[0]->clone(expolygon => $_),
@{diff_ex(
[ map $_->p, @$group ],
[ map @$_, @$to_bridge ],
)};
push @new_surfaces, map Slic3r::Surface->new(
expolygon => $_,
surface_type => stInternalVoid,
), @{intersection_ex(
[ map $_->p, @$group ],
[ map @$_, @$to_bridge ],
)};
}
$lower_layerm->fill_surfaces->clear;
$lower_layerm->fill_surfaces->append($_) for @new_surfaces;
}
$excess -= $self->get_layer($i)->height;
}
}
*/
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
layerm->export_region_slices_to_svg_debug("7_bridge_over_infill");
layerm->export_region_fill_surfaces_to_svg_debug("7_bridge_over_infill");
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
m_print->throw_if_canceled();
}
});
}
static void clamp_exturder_to_default(ConfigOptionInt &opt, size_t num_extruders)
{
if (opt.value > (int)num_extruders)
// assign the default extruder
opt.value = 1;
}
PrintObjectConfig PrintObject::object_config_from_model_object(const PrintObjectConfig &default_object_config, const ModelObject &object, size_t num_extruders)
{
PrintObjectConfig config = default_object_config;
{
DynamicPrintConfig src_normalized(object.config.get());
src_normalized.normalize_fdm();
config.apply(src_normalized, true);
}
// Clamp invalid extruders to the default extruder (with index 1).
clamp_exturder_to_default(config.support_material_extruder, num_extruders);
clamp_exturder_to_default(config.support_material_interface_extruder, num_extruders);
return config;
}
const std::string key_extruder { "extruder" };
static constexpr const std::initializer_list<const std::string_view> keys_extruders { "infill_extruder"sv, "solid_infill_extruder"sv, "perimeter_extruder"sv };
static void apply_to_print_region_config(PrintRegionConfig &out, const DynamicPrintConfig &in)
{
// 1) Copy the "extruder key to infill_extruder and perimeter_extruder.
auto *opt_extruder = in.opt<ConfigOptionInt>(key_extruder);
if (opt_extruder)
if (int extruder = opt_extruder->value; extruder != 0) {
// Not a default extruder.
out.infill_extruder .value = extruder;
out.solid_infill_extruder.value = extruder;
out.perimeter_extruder .value = extruder;
}
// 2) Copy the rest of the values.
for (auto it = in.cbegin(); it != in.cend(); ++ it)
if (it->first != key_extruder)
if (ConfigOption* my_opt = out.option(it->first, false); my_opt != nullptr) {
if (one_of(it->first, keys_extruders)) {
// Ignore "default" extruders.
int extruder = static_cast<const ConfigOptionInt*>(it->second.get())->value;
if (extruder > 0)
my_opt->setInt(extruder);
} else
my_opt->set(it->second.get());
}
}
PrintRegionConfig region_config_from_model_volume(const PrintRegionConfig &default_or_parent_region_config, const DynamicPrintConfig *layer_range_config, const ModelVolume &volume, size_t num_extruders)
{
PrintRegionConfig config = default_or_parent_region_config;
if (volume.is_model_part()) {
// default_or_parent_region_config contains the Print's PrintRegionConfig.
// Override with ModelObject's PrintRegionConfig values.
apply_to_print_region_config(config, volume.get_object()->config.get());
} else {
// default_or_parent_region_config contains parent PrintRegion config, which already contains ModelVolume's config.
}
if (layer_range_config != nullptr) {
// Not applicable to modifiers.
assert(volume.is_model_part());
apply_to_print_region_config(config, *layer_range_config);
}
apply_to_print_region_config(config, volume.config.get());
if (! volume.material_id().empty())
apply_to_print_region_config(config, volume.material()->config.get());
// Clamp invalid extruders to the default extruder (with index 1).
clamp_exturder_to_default(config.infill_extruder, num_extruders);
clamp_exturder_to_default(config.perimeter_extruder, num_extruders);
clamp_exturder_to_default(config.solid_infill_extruder, num_extruders);
if (config.fill_density.value < 0.00011f)
// Switch of infill for very low infill rates, also avoid division by zero in infill generator for these very low rates.
// See GH issue #5910.
config.fill_density.value = 0;
else
config.fill_density.value = std::min(config.fill_density.value, 100.);
if (config.fuzzy_skin.value != FuzzySkinType::None && (config.fuzzy_skin_point_dist.value < 0.01 || config.fuzzy_skin_thickness.value < 0.001))
config.fuzzy_skin.value = FuzzySkinType::None;
return config;
}
void PrintObject::update_slicing_parameters()
{
if (!m_slicing_params.valid)
m_slicing_params = SlicingParameters::create_from_config(
this->print()->config(), m_config, this->model_object()->bounding_box().max.z(), this->object_extruders());
}
SlicingParameters PrintObject::slicing_parameters(const DynamicPrintConfig& full_config, const ModelObject& model_object, float object_max_z)
{
PrintConfig print_config;
PrintObjectConfig object_config;
PrintRegionConfig default_region_config;
print_config.apply(full_config, true);
object_config.apply(full_config, true);
default_region_config.apply(full_config, true);
size_t num_extruders = print_config.nozzle_diameter.size();
object_config = object_config_from_model_object(object_config, model_object, num_extruders);
std::vector<unsigned int> object_extruders;
for (const ModelVolume* model_volume : model_object.volumes)
if (model_volume->is_model_part()) {
PrintRegion::collect_object_printing_extruders(
print_config,
region_config_from_model_volume(default_region_config, nullptr, *model_volume, num_extruders),
object_config.brim_type != btNoBrim && object_config.brim_width > 0.,
object_extruders);
for (const std::pair<const t_layer_height_range, ModelConfig> &range_and_config : model_object.layer_config_ranges)
if (range_and_config.second.has("perimeter_extruder") ||
range_and_config.second.has("infill_extruder") ||
range_and_config.second.has("solid_infill_extruder"))
PrintRegion::collect_object_printing_extruders(
print_config,
region_config_from_model_volume(default_region_config, &range_and_config.second.get(), *model_volume, num_extruders),
object_config.brim_type != btNoBrim && object_config.brim_width > 0.,
object_extruders);
}
sort_remove_duplicates(object_extruders);
//FIXME add painting extruders
if (object_max_z <= 0.f)
object_max_z = (float)model_object.raw_bounding_box().size().z();
return SlicingParameters::create_from_config(print_config, object_config, object_max_z, object_extruders);
}
// returns 0-based indices of extruders used to print the object (without brim, support and other helper extrusions)
std::vector<unsigned int> PrintObject::object_extruders() const
{
std::vector<unsigned int> extruders;
extruders.reserve(this->all_regions().size() * 3);
for (const PrintRegion &region : this->all_regions())
region.collect_object_printing_extruders(*this->print(), extruders);
sort_remove_duplicates(extruders);
return extruders;
}
bool PrintObject::update_layer_height_profile(const ModelObject &model_object, const SlicingParameters &slicing_parameters, std::vector<coordf_t> &layer_height_profile)
{
bool updated = false;
if (layer_height_profile.empty()) {
// use the constructor because the assignement is crashing on ASAN OsX
layer_height_profile = std::vector<coordf_t>(model_object.layer_height_profile.get());
// layer_height_profile = model_object.layer_height_profile;
updated = true;
}
// Verify the layer_height_profile.
if (!layer_height_profile.empty() &&
// Must not be of even length.
((layer_height_profile.size() & 1) != 0 ||
// Last entry must be at the top of the object.
std::abs(layer_height_profile[layer_height_profile.size() - 2] - slicing_parameters.object_print_z_max + slicing_parameters.object_print_z_min) > 1e-3))
layer_height_profile.clear();
if (layer_height_profile.empty()) {
//layer_height_profile = layer_height_profile_adaptive(slicing_parameters, model_object.layer_config_ranges, model_object.volumes);
layer_height_profile = layer_height_profile_from_ranges(slicing_parameters, model_object.layer_config_ranges);
updated = true;
}
return updated;
}
// Only active if config->infill_only_where_needed. This step trims the sparse infill,
// so it acts as an internal support. It maintains all other infill types intact.
// Here the internal surfaces and perimeters have to be supported by the sparse infill.
//FIXME The surfaces are supported by a sparse infill, but the sparse infill is only as large as the area to support.
// Likely the sparse infill will not be anchored correctly, so it will not work as intended.
// Also one wishes the perimeters to be supported by a full infill.
// Idempotence of this method is guaranteed by the fact that we don't remove things from
// fill_surfaces but we only turn them into VOID surfaces, thus preserving the boundaries.
void PrintObject::clip_fill_surfaces()
{
bool has_lightning_infill = false;
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++region_id)
if (const PrintRegionConfig &config = this->printing_region(region_id).config(); config.fill_density > 0 && config.fill_pattern == ipLightning)
has_lightning_infill = true;
// For Lightning infill, infill_only_where_needed is ignored because both
// do a similar thing, and their combination doesn't make much sense.
if (! m_config.infill_only_where_needed.value || has_lightning_infill)
return;
bool has_infill = false;
for (size_t i = 0; i < this->num_printing_regions(); ++ i)
if (this->printing_region(i).config().fill_density > 0) {
has_infill = true;
break;
}
if (! has_infill)
return;
// We only want infill under ceilings; this is almost like an
// internal support material.
// Proceed top-down, skipping the bottom layer.
Polygons upper_internal;
for (int layer_id = int(m_layers.size()) - 1; layer_id > 0; -- layer_id) {
Layer *layer = m_layers[layer_id];
Layer *lower_layer = m_layers[layer_id - 1];
// Detect things that we need to support.
// Cummulative fill surfaces.
Polygons fill_surfaces;
// Solid surfaces to be supported.
Polygons overhangs;
for (const LayerRegion *layerm : layer->m_regions)
for (const Surface &surface : layerm->fill_surfaces.surfaces) {
Polygons polygons = to_polygons(surface.expolygon);
if (surface.is_solid())
polygons_append(overhangs, polygons);
polygons_append(fill_surfaces, std::move(polygons));
}
Polygons lower_layer_fill_surfaces;
Polygons lower_layer_internal_surfaces;
for (const LayerRegion *layerm : lower_layer->m_regions)
for (const Surface &surface : layerm->fill_surfaces.surfaces) {
Polygons polygons = to_polygons(surface.expolygon);
if (surface.surface_type == stInternal || surface.surface_type == stInternalVoid)
polygons_append(lower_layer_internal_surfaces, polygons);
polygons_append(lower_layer_fill_surfaces, std::move(polygons));
}
// We also need to support perimeters when there's at least one full unsupported loop
{
// Get perimeters area as the difference between slices and fill_surfaces
// Only consider the area that is not supported by lower perimeters
Polygons perimeters = intersection(diff(layer->lslices, fill_surfaces), lower_layer_fill_surfaces);
// Only consider perimeter areas that are at least one extrusion width thick.
//FIXME Offset2 eats out from both sides, while the perimeters are create outside in.
//Should the pw not be half of the current value?
float pw = FLT_MAX;
for (const LayerRegion *layerm : layer->m_regions)
pw = std::min(pw, (float)layerm->flow(frPerimeter).scaled_width());
// Append such thick perimeters to the areas that need support
polygons_append(overhangs, opening(perimeters, pw));
}
// Merge the new overhangs, find new internal infill.
polygons_append(upper_internal, std::move(overhangs));
static constexpr const auto closing_radius = scaled<float>(2.f);
upper_internal = intersection(
// Regularize the overhang regions, so that the infill areas will not become excessively jagged.
smooth_outward(
closing(upper_internal, closing_radius, ClipperLib::jtSquare, 0.),
scaled<coord_t>(0.1)),
lower_layer_internal_surfaces);
// Apply new internal infill to regions.
for (LayerRegion *layerm : lower_layer->m_regions) {
if (layerm->region().config().fill_density.value == 0)
continue;
SurfaceType internal_surface_types[] = { stInternal, stInternalVoid };
Polygons internal;
for (Surface &surface : layerm->fill_surfaces.surfaces)
if (surface.surface_type == stInternal || surface.surface_type == stInternalVoid)
polygons_append(internal, std::move(surface.expolygon));
layerm->fill_surfaces.remove_types(internal_surface_types, 2);
layerm->fill_surfaces.append(intersection_ex(internal, upper_internal, ApplySafetyOffset::Yes), stInternal);
layerm->fill_surfaces.append(diff_ex (internal, upper_internal, ApplySafetyOffset::Yes), stInternalVoid);
// If there are voids it means that our internal infill is not adjacent to
// perimeters. In this case it would be nice to add a loop around infill to
// make it more robust and nicer. TODO.
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
layerm->export_region_fill_surfaces_to_svg_debug("6_clip_fill_surfaces");
#endif
}
m_print->throw_if_canceled();
}
}
void PrintObject::discover_horizontal_shells()
{
BOOST_LOG_TRIVIAL(trace) << "discover_horizontal_shells()";
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++ region_id) {
for (size_t i = 0; i < m_layers.size(); ++ i) {
m_print->throw_if_canceled();
Layer *layer = m_layers[i];
LayerRegion *layerm = layer->regions()[region_id];
const PrintRegionConfig &region_config = layerm->region().config();
if (region_config.solid_infill_every_layers.value > 0 && region_config.fill_density.value > 0 &&
(i % region_config.solid_infill_every_layers) == 0) {
// Insert a solid internal layer. Mark stInternal surfaces as stInternalSolid or stInternalBridge.
SurfaceType type = (region_config.fill_density == 100 || region_config.solid_infill_every_layers == 1) ? stInternalSolid : stInternalBridge;
for (Surface &surface : layerm->fill_surfaces.surfaces)
if (surface.surface_type == stInternal)
surface.surface_type = type;
}
// If ensure_vertical_shell_thickness, then the rest has already been performed by discover_vertical_shells().
if (region_config.ensure_vertical_shell_thickness.value)
continue;
coordf_t print_z = layer->print_z;
coordf_t bottom_z = layer->bottom_z();
for (size_t idx_surface_type = 0; idx_surface_type < 3; ++ idx_surface_type) {
m_print->throw_if_canceled();
SurfaceType type = (idx_surface_type == 0) ? stTop : (idx_surface_type == 1) ? stBottom : stBottomBridge;
int num_solid_layers = (type == stTop) ? region_config.top_solid_layers.value : region_config.bottom_solid_layers.value;
if (num_solid_layers == 0)
continue;
// Find slices of current type for current layer.
// Use slices instead of fill_surfaces, because they also include the perimeter area,
// which needs to be propagated in shells; we need to grow slices like we did for
// fill_surfaces though. Using both ungrown slices and grown fill_surfaces will
// not work in some situations, as there won't be any grown region in the perimeter
// area (this was seen in a model where the top layer had one extra perimeter, thus
// its fill_surfaces were thinner than the lower layer's infill), however it's the best
// solution so far. Growing the external slices by EXTERNAL_INFILL_MARGIN will put
// too much solid infill inside nearly-vertical slopes.
// Surfaces including the area of perimeters. Everything, that is visible from the top / bottom
// (not covered by a layer above / below).
// This does not contain the areas covered by perimeters!
Polygons solid;
for (const Surface &surface : layerm->slices.surfaces)
if (surface.surface_type == type)
polygons_append(solid, to_polygons(surface.expolygon));
// Infill areas (slices without the perimeters).
for (const Surface &surface : layerm->fill_surfaces.surfaces)
if (surface.surface_type == type)
polygons_append(solid, to_polygons(surface.expolygon));
if (solid.empty())
continue;
// Slic3r::debugf "Layer %d has %s surfaces\n", $i, ($type == stTop) ? 'top' : 'bottom';
// Scatter top / bottom regions to other layers. Scattering process is inherently serial, it is difficult to parallelize without locking.
for (int n = (type == stTop) ? int(i) - 1 : int(i) + 1;
(type == stTop) ?
(n >= 0 && (int(i) - n < num_solid_layers ||
print_z - m_layers[n]->print_z < region_config.top_solid_min_thickness.value - EPSILON)) :
(n < int(m_layers.size()) && (n - int(i) < num_solid_layers ||
m_layers[n]->bottom_z() - bottom_z < region_config.bottom_solid_min_thickness.value - EPSILON));
(type == stTop) ? -- n : ++ n)
{
// Slic3r::debugf " looking for neighbors on layer %d...\n", $n;
// Reference to the lower layer of a TOP surface, or an upper layer of a BOTTOM surface.
LayerRegion *neighbor_layerm = m_layers[n]->regions()[region_id];
// find intersection between neighbor and current layer's surfaces
// intersections have contours and holes
// we update $solid so that we limit the next neighbor layer to the areas that were
// found on this one - in other words, solid shells on one layer (for a given external surface)
// are always a subset of the shells found on the previous shell layer
// this approach allows for DWIM in hollow sloping vases, where we want bottom
// shells to be generated in the base but not in the walls (where there are many
// narrow bottom surfaces): reassigning $solid will consider the 'shadow' of the
// upper perimeter as an obstacle and shell will not be propagated to more upper layers
//FIXME How does it work for stInternalBRIDGE? This is set for sparse infill. Likely this does not work.
Polygons new_internal_solid;
{
Polygons internal;
for (const Surface &surface : neighbor_layerm->fill_surfaces.surfaces)
if (surface.surface_type == stInternal || surface.surface_type == stInternalSolid)
polygons_append(internal, to_polygons(surface.expolygon));
new_internal_solid = intersection(solid, internal, ApplySafetyOffset::Yes);
}
if (new_internal_solid.empty()) {
// No internal solid needed on this layer. In order to decide whether to continue
// searching on the next neighbor (thus enforcing the configured number of solid
// layers, use different strategies according to configured infill density:
if (region_config.fill_density.value == 0) {
// If user expects the object to be void (for example a hollow sloping vase),
// don't continue the search. In this case, we only generate the external solid
// shell if the object would otherwise show a hole (gap between perimeters of
// the two layers), and internal solid shells are a subset of the shells found
// on each previous layer.
goto EXTERNAL;
} else {
// If we have internal infill, we can generate internal solid shells freely.
continue;
}
}
if (region_config.fill_density.value == 0) {
// if we're printing a hollow object we discard any solid shell thinner
// than a perimeter width, since it's probably just crossing a sloping wall
// and it's not wanted in a hollow print even if it would make sense when
// obeying the solid shell count option strictly (DWIM!)
float margin = float(neighbor_layerm->flow(frExternalPerimeter).scaled_width());
Polygons too_narrow = diff(
new_internal_solid,
opening(new_internal_solid, margin, margin + ClipperSafetyOffset, jtMiter, 5));
// Trim the regularized region by the original region.
if (! too_narrow.empty())
new_internal_solid = solid = diff(new_internal_solid, too_narrow);
}
// make sure the new internal solid is wide enough, as it might get collapsed
// when spacing is added in Fill.pm
{
//FIXME Vojtech: Disable this and you will be sorry.
// https://github.com/prusa3d/PrusaSlicer/issues/26 bottom
float margin = 3.f * layerm->flow(frSolidInfill).scaled_width(); // require at least this size
// we use a higher miterLimit here to handle areas with acute angles
// in those cases, the default miterLimit would cut the corner and we'd
// get a triangle in $too_narrow; if we grow it below then the shell
// would have a different shape from the external surface and we'd still
// have the same angle, so the next shell would be grown even more and so on.
Polygons too_narrow = diff(
new_internal_solid,
opening(new_internal_solid, margin, margin + ClipperSafetyOffset, ClipperLib::jtMiter, 5));
if (! too_narrow.empty()) {
// grow the collapsing parts and add the extra area to the neighbor layer
// as well as to our original surfaces so that we support this
// additional area in the next shell too
// make sure our grown surfaces don't exceed the fill area
Polygons internal;
for (const Surface &surface : neighbor_layerm->fill_surfaces.surfaces)
if (surface.is_internal() && !surface.is_bridge())
polygons_append(internal, to_polygons(surface.expolygon));
polygons_append(new_internal_solid,
intersection(
expand(too_narrow, +margin),
// Discard bridges as they are grown for anchoring and we can't
// remove such anchors. (This may happen when a bridge is being
// anchored onto a wall where little space remains after the bridge
// is grown, and that little space is an internal solid shell so
// it triggers this too_narrow logic.)
internal));
// see https://github.com/prusa3d/PrusaSlicer/pull/3426
// solid = new_internal_solid;
}
}
// internal-solid are the union of the existing internal-solid surfaces
// and new ones
SurfaceCollection backup = std::move(neighbor_layerm->fill_surfaces);
polygons_append(new_internal_solid, to_polygons(backup.filter_by_type(stInternalSolid)));
ExPolygons internal_solid = union_ex(new_internal_solid);
// assign new internal-solid surfaces to layer
neighbor_layerm->fill_surfaces.set(internal_solid, stInternalSolid);
// subtract intersections from layer surfaces to get resulting internal surfaces
Polygons polygons_internal = to_polygons(std::move(internal_solid));
ExPolygons internal = diff_ex(backup.filter_by_type(stInternal), polygons_internal, ApplySafetyOffset::Yes);
// assign resulting internal surfaces to layer
neighbor_layerm->fill_surfaces.append(internal, stInternal);
polygons_append(polygons_internal, to_polygons(std::move(internal)));
// assign top and bottom surfaces to layer
SurfaceType surface_types_solid[] = { stTop, stBottom, stBottomBridge };
backup.keep_types(surface_types_solid, 3);
std::vector<SurfacesPtr> top_bottom_groups;
backup.group(&top_bottom_groups);
for (SurfacesPtr &group : top_bottom_groups)
neighbor_layerm->fill_surfaces.append(
diff_ex(group, polygons_internal),
// Use an existing surface as a template, it carries the bridge angle etc.
*group.front());
}
EXTERNAL:;
} // foreach type (stTop, stBottom, stBottomBridge)
} // for each layer
} // for each region
#ifdef SLIC3R_DEBUG_SLICE_PROCESSING
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++ region_id) {
for (const Layer *layer : m_layers) {
const LayerRegion *layerm = layer->m_regions[region_id];
layerm->export_region_slices_to_svg_debug("5_discover_horizontal_shells");
layerm->export_region_fill_surfaces_to_svg_debug("5_discover_horizontal_shells");
} // for each layer
} // for each region
#endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
}
// combine fill surfaces across layers to honor the "infill every N layers" option
// Idempotence of this method is guaranteed by the fact that we don't remove things from
// fill_surfaces but we only turn them into VOID surfaces, thus preserving the boundaries.
void PrintObject::combine_infill()
{
// Work on each region separately.
for (size_t region_id = 0; region_id < this->num_printing_regions(); ++ region_id) {
const PrintRegion &region = this->printing_region(region_id);
const size_t every = region.config().infill_every_layers.value;
if (every < 2 || region.config().fill_density == 0.)
continue;
// Limit the number of combined layers to the maximum height allowed by this regions' nozzle.
//FIXME limit the layer height to max_layer_height
double nozzle_diameter = std::min(
this->print()->config().nozzle_diameter.get_at(region.config().infill_extruder.value - 1),
this->print()->config().nozzle_diameter.get_at(region.config().solid_infill_extruder.value - 1));
// define the combinations
std::vector<size_t> combine(m_layers.size(), 0);
{
double current_height = 0.;
size_t num_layers = 0;
for (size_t layer_idx = 0; layer_idx < m_layers.size(); ++ layer_idx) {
m_print->throw_if_canceled();
const Layer *layer = m_layers[layer_idx];
if (layer->id() == 0)
// Skip first print layer (which may not be first layer in array because of raft).
continue;
// Check whether the combination of this layer with the lower layers' buffer
// would exceed max layer height or max combined layer count.
if (current_height + layer->height >= nozzle_diameter + EPSILON || num_layers >= every) {
// Append combination to lower layer.
combine[layer_idx - 1] = num_layers;
current_height = 0.;
num_layers = 0;
}
current_height += layer->height;
++ num_layers;
}
// Append lower layers (if any) to uppermost layer.
combine[m_layers.size() - 1] = num_layers;
}
// loop through layers to which we have assigned layers to combine
for (size_t layer_idx = 0; layer_idx < m_layers.size(); ++ layer_idx) {
m_print->throw_if_canceled();
size_t num_layers = combine[layer_idx];
if (num_layers <= 1)
continue;
// Get all the LayerRegion objects to be combined.
std::vector<LayerRegion*> layerms;
layerms.reserve(num_layers);
for (size_t i = layer_idx + 1 - num_layers; i <= layer_idx; ++ i)
layerms.emplace_back(m_layers[i]->regions()[region_id]);
// We need to perform a multi-layer intersection, so let's split it in pairs.
// Initialize the intersection with the candidates of the lowest layer.
ExPolygons intersection = to_expolygons(layerms.front()->fill_surfaces.filter_by_type(stInternal));
// Start looping from the second layer and intersect the current intersection with it.
for (size_t i = 1; i < layerms.size(); ++ i)
intersection = intersection_ex(layerms[i]->fill_surfaces.filter_by_type(stInternal), intersection);
double area_threshold = layerms.front()->infill_area_threshold();
if (! intersection.empty() && area_threshold > 0.)
intersection.erase(std::remove_if(intersection.begin(), intersection.end(),
[area_threshold](const ExPolygon &expoly) { return expoly.area() <= area_threshold; }),
intersection.end());
if (intersection.empty())
continue;
// Slic3r::debugf " combining %d %s regions from layers %d-%d\n",
// scalar(@$intersection),
// ($type == stInternal ? 'internal' : 'internal-solid'),
// $layer_idx-($every-1), $layer_idx;
// intersection now contains the regions that can be combined across the full amount of layers,
// so let's remove those areas from all layers.
Polygons intersection_with_clearance;
intersection_with_clearance.reserve(intersection.size());
float clearance_offset =
0.5f * layerms.back()->flow(frPerimeter).scaled_width() +
// Because fill areas for rectilinear and honeycomb are grown
// later to overlap perimeters, we need to counteract that too.
((region.config().fill_pattern == ipRectilinear ||
region.config().fill_pattern == ipMonotonic ||
region.config().fill_pattern == ipGrid ||
region.config().fill_pattern == ipLine ||
region.config().fill_pattern == ipHoneycomb) ? 1.5f : 0.5f) *
layerms.back()->flow(frSolidInfill).scaled_width();
for (ExPolygon &expoly : intersection)
polygons_append(intersection_with_clearance, offset(expoly, clearance_offset));
for (LayerRegion *layerm : layerms) {
Polygons internal = to_polygons(std::move(layerm->fill_surfaces.filter_by_type(stInternal)));
layerm->fill_surfaces.remove_type(stInternal);
layerm->fill_surfaces.append(diff_ex(internal, intersection_with_clearance), stInternal);
if (layerm == layerms.back()) {
// Apply surfaces back with adjusted depth to the uppermost layer.
Surface templ(stInternal, ExPolygon());
templ.thickness = 0.;
for (LayerRegion *layerm2 : layerms)
templ.thickness += layerm2->layer()->height;
templ.thickness_layers = (unsigned short)layerms.size();
layerm->fill_surfaces.append(intersection, templ);
} else {
// Save void surfaces.
layerm->fill_surfaces.append(
intersection_ex(internal, intersection_with_clearance),
stInternalVoid);
}
}
}
}
}
void PrintObject::_generate_support_material()
{
if (m_config.support_material_style == smsTree) {
fff_tree_support_generate(*this, std::function<void()>([this](){ this->throw_if_canceled(); }));
} else {
PrintObjectSupportMaterial support_material(this, m_slicing_params);
support_material.generate(*this);
}
}
static void project_triangles_to_slabs(ConstLayerPtrsAdaptor layers, const indexed_triangle_set &custom_facets, const Transform3f &tr, bool seam, std::vector<Polygons> &out)
{
if (custom_facets.indices.empty())
return;
const float tr_det_sign = (tr.matrix().determinant() > 0. ? 1.f : -1.f);
// The projection will be at most a pentagon. Let's minimize heap
// reallocations by saving in in the following struct.
// Points are used so that scaling can be done in parallel
// and they can be moved from to create an ExPolygon later.
struct LightPolygon {
LightPolygon() { pts.reserve(5); }
LightPolygon(const std::array<Vec2f, 3>& tri) {
pts.reserve(3);
pts.emplace_back(scaled<coord_t>(tri.front()));
pts.emplace_back(scaled<coord_t>(tri[1]));
pts.emplace_back(scaled<coord_t>(tri.back()));
}
Points pts;
void add(const Vec2f& pt) {
pts.emplace_back(scaled<coord_t>(pt));
assert(pts.size() <= 5);
}
};
// Structure to collect projected polygons. One element for each triangle.
// Saves vector of polygons and layer_id of the first one.
struct TriangleProjections {
size_t first_layer_id;
std::vector<LightPolygon> polygons;
};
// Vector to collect resulting projections from each triangle.
std::vector<TriangleProjections> projections_of_triangles(custom_facets.indices.size());
// Iterate over all triangles.
tbb::parallel_for(
tbb::blocked_range<size_t>(0, custom_facets.indices.size()),
[&custom_facets, &tr, tr_det_sign, seam, layers, &projections_of_triangles](const tbb::blocked_range<size_t>& range) {
for (size_t idx = range.begin(); idx < range.end(); ++ idx) {
std::array<Vec3f, 3> facet;
// Transform the triangle into worlds coords.
for (int i=0; i<3; ++i)
facet[i] = tr * custom_facets.vertices[custom_facets.indices[idx](i)];
// Ignore triangles with upward-pointing normal. Don't forget about mirroring.
float z_comp = (facet[1]-facet[0]).cross(facet[2]-facet[0]).z();
if (! seam && tr_det_sign * z_comp > 0.)
continue;
// The algorithm does not process vertical triangles, but it should for seam.
// In that case, tilt the triangle a bit so the projection does not degenerate.
if (seam && z_comp == 0.f)
facet[0].x() += float(EPSILON);
// Sort the three vertices according to z-coordinate.
std::sort(facet.begin(), facet.end(),
[](const Vec3f& pt1, const Vec3f&pt2) {
return pt1.z() < pt2.z();
});
std::array<Vec2f, 3> trianglef;
for (int i=0; i<3; ++i)
trianglef[i] = to_2d(facet[i]);
// Find lowest slice not below the triangle.
auto it = std::lower_bound(layers.begin(), layers.end(), facet[0].z()+EPSILON,
[](const Layer* l1, float z) {
return l1->slice_z < z;
});
// Count how many projections will be generated for this triangle
// and allocate respective amount in projections_of_triangles.
size_t first_layer_id = projections_of_triangles[idx].first_layer_id = it - layers.begin();
size_t last_layer_id = first_layer_id;
// The cast in the condition below is important. The comparison must
// be an exact opposite of the one lower in the code where
// the polygons are appended. And that one is on floats.
while (last_layer_id + 1 < layers.size()
&& float(layers[last_layer_id]->slice_z) <= facet[2].z())
++last_layer_id;
if (first_layer_id == last_layer_id) {
// The triangle fits just a single slab, just project it. This also avoids division by zero for horizontal triangles.
float dz = facet[2].z() - facet[0].z();
assert(dz >= 0);
// The face is nearly horizontal and it crosses the slicing plane at first_layer_id - 1.
// Rather add this face to both the planes.
bool add_below = dz < float(2. * EPSILON) && first_layer_id > 0 && layers[first_layer_id - 1]->slice_z > facet[0].z() - EPSILON;
projections_of_triangles[idx].polygons.reserve(add_below ? 2 : 1);
projections_of_triangles[idx].polygons.emplace_back(trianglef);
if (add_below) {
-- projections_of_triangles[idx].first_layer_id;
projections_of_triangles[idx].polygons.emplace_back(trianglef);
}
continue;
}
projections_of_triangles[idx].polygons.resize(last_layer_id - first_layer_id + 1);
// Calculate how to move points on triangle sides per unit z increment.
Vec2f ta(trianglef[1] - trianglef[0]);
Vec2f tb(trianglef[2] - trianglef[0]);
ta *= 1.f/(facet[1].z() - facet[0].z());
tb *= 1.f/(facet[2].z() - facet[0].z());
// Projection on current slice will be built directly in place.
LightPolygon* proj = &projections_of_triangles[idx].polygons[0];
proj->add(trianglef[0]);
bool passed_first = false;
bool stop = false;
// Project a sub-polygon on all slices intersecting the triangle.
while (it != layers.end()) {
const float z = float((*it)->slice_z);
// Projections of triangle sides intersections with slices.
// a moves along one side, b tracks the other.
Vec2f a;
Vec2f b;
// If the middle vertex was already passed, append the vertex
// and use ta for tracking the remaining side.
if (z > facet[1].z() && ! passed_first) {
proj->add(trianglef[1]);
ta = trianglef[2]-trianglef[1];
ta *= 1.f/(facet[2].z() - facet[1].z());
passed_first = true;
}
// This slice is above the triangle already.
if (z > facet[2].z() || it+1 == layers.end()) {
proj->add(trianglef[2]);
stop = true;
}
else {
// Move a, b along the side it currently tracks to get
// projected intersection with current slice.
a = passed_first ? (trianglef[1]+ta*(z-facet[1].z()))
: (trianglef[0]+ta*(z-facet[0].z()));
b = trianglef[0]+tb*(z-facet[0].z());
proj->add(a);
proj->add(b);
}
if (stop)
break;
// Advance to the next layer.
++it;
++proj;
assert(proj <= &projections_of_triangles[idx].polygons.back() );
// a, b are first two points of the polygon for the next layer.
proj->add(b);
proj->add(a);
}
}
}); // end of parallel_for
// Make sure that the output vector can be used.
out.resize(layers.size());
// Now append the collected polygons to respective layers.
for (auto& trg : projections_of_triangles) {
int layer_id = int(trg.first_layer_id);
for (LightPolygon &poly : trg.polygons) {
if (layer_id >= int(out.size()))
break; // part of triangle could be projected above top layer
assert(! poly.pts.empty());
// The resulting triangles are fed to the Clipper library, which seem to handle flipped triangles well.
// if (cross2(Vec2d((poly.pts[1] - poly.pts[0]).cast<double>()), Vec2d((poly.pts[2] - poly.pts[1]).cast<double>())) < 0)
// std::swap(poly.pts.front(), poly.pts.back());
out[layer_id].emplace_back(std::move(poly.pts));
++layer_id;
}
}
}
void PrintObject::project_and_append_custom_facets(
bool seam, EnforcerBlockerType type, std::vector<Polygons>& out) const
{
for (const ModelVolume* mv : this->model_object()->volumes)
if (mv->is_model_part()) {
const indexed_triangle_set custom_facets = seam
? mv->seam_facets.get_facets_strict(*mv, type)
: mv->supported_facets.get_facets_strict(*mv, type);
if (! custom_facets.indices.empty()) {
if (seam)
project_triangles_to_slabs(this->layers(), custom_facets,
(this->trafo_centered() * mv->get_matrix()).cast<float>(),
seam, out);
else {
std::vector<Polygons> projected;
// Support blockers or enforcers. Project downward facing painted areas upwards to their respective slicing plane.
slice_mesh_slabs(custom_facets, zs_from_layers(this->layers()), this->trafo_centered() * mv->get_matrix(), nullptr, &projected, [](){});
// Merge these projections with the output, layer by layer.
assert(! projected.empty());
assert(out.empty() || out.size() == projected.size());
if (out.empty())
out = std::move(projected);
else
for (size_t i = 0; i < out.size(); ++ i)
append(out[i], std::move(projected[i]));
}
}
}
}
const Layer* PrintObject::get_layer_at_printz(coordf_t print_z) const {
auto it = Slic3r::lower_bound_by_predicate(m_layers.begin(), m_layers.end(), [print_z](const Layer *layer) { return layer->print_z < print_z; });
return (it == m_layers.end() || (*it)->print_z != print_z) ? nullptr : *it;
}
Layer* PrintObject::get_layer_at_printz(coordf_t print_z) { return const_cast<Layer*>(std::as_const(*this).get_layer_at_printz(print_z)); }
// Get a layer approximately at print_z.
const Layer* PrintObject::get_layer_at_printz(coordf_t print_z, coordf_t epsilon) const {
coordf_t limit = print_z - epsilon;
auto it = Slic3r::lower_bound_by_predicate(m_layers.begin(), m_layers.end(), [limit](const Layer *layer) { return layer->print_z < limit; });
return (it == m_layers.end() || (*it)->print_z > print_z + epsilon) ? nullptr : *it;
}
Layer* PrintObject::get_layer_at_printz(coordf_t print_z, coordf_t epsilon) { return const_cast<Layer*>(std::as_const(*this).get_layer_at_printz(print_z, epsilon)); }
const Layer *PrintObject::get_first_layer_bellow_printz(coordf_t print_z, coordf_t epsilon) const
{
coordf_t limit = print_z + epsilon;
auto it = Slic3r::lower_bound_by_predicate(m_layers.begin(), m_layers.end(), [limit](const Layer *layer) { return layer->print_z < limit; });
return (it == m_layers.begin()) ? nullptr : *(--it);
}
} // namespace Slic3r
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