#include <limits>
#include "libslic3r.h"
#include "Slicing.hpp"
#include "SlicingAdaptive.hpp"
#include "PrintConfig.hpp"
#include "Model.hpp"
// #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
{
static const coordf_t MIN_LAYER_HEIGHT = 0.01;
static const coordf_t MIN_LAYER_HEIGHT_DEFAULT = 0.07;
// Minimum layer height for the variable layer height algorithm.
inline coordf_t min_layer_height_from_nozzle(const PrintConfig &print_config, int idx_nozzle)
{
coordf_t min_layer_height = print_config.min_layer_height.get_at(idx_nozzle - 1);
return (min_layer_height == 0.) ? MIN_LAYER_HEIGHT_DEFAULT : std::max(MIN_LAYER_HEIGHT, min_layer_height);
}
// Maximum layer height for the variable layer height algorithm, 3/4 of a nozzle dimaeter by default,
// it should not be smaller than the minimum layer height.
inline coordf_t max_layer_height_from_nozzle(const PrintConfig &print_config, int idx_nozzle)
{
coordf_t min_layer_height = min_layer_height_from_nozzle(print_config, idx_nozzle);
coordf_t max_layer_height = print_config.max_layer_height.get_at(idx_nozzle - 1);
coordf_t nozzle_dmr = print_config.nozzle_diameter.get_at(idx_nozzle - 1);
return std::max(min_layer_height, (max_layer_height == 0.) ? (0.75 * nozzle_dmr) : max_layer_height);
}
// Minimum layer height for the variable layer height algorithm.
coordf_t Slicing::min_layer_height_from_nozzle(const DynamicPrintConfig &print_config, int idx_nozzle)
{
coordf_t min_layer_height = print_config.opt_float("min_layer_height", idx_nozzle - 1);
return (min_layer_height == 0.) ? MIN_LAYER_HEIGHT_DEFAULT : std::max(MIN_LAYER_HEIGHT, min_layer_height);
}
// Maximum layer height for the variable layer height algorithm, 3/4 of a nozzle dimaeter by default,
// it should not be smaller than the minimum layer height.
coordf_t Slicing::max_layer_height_from_nozzle(const DynamicPrintConfig &print_config, int idx_nozzle)
{
coordf_t min_layer_height = min_layer_height_from_nozzle(print_config, idx_nozzle);
coordf_t max_layer_height = print_config.opt_float("max_layer_height", idx_nozzle - 1);
coordf_t nozzle_dmr = print_config.opt_float("nozzle_diameter", idx_nozzle - 1);
return std::max(min_layer_height, (max_layer_height == 0.) ? (0.75 * nozzle_dmr) : max_layer_height);
}
SlicingParameters SlicingParameters::create_from_config(
const PrintConfig &print_config,
const PrintObjectConfig &object_config,
coordf_t object_height,
const std::vector<unsigned int> &object_extruders)
{
coordf_t first_layer_height = (object_config.first_layer_height.value <= 0) ?
object_config.layer_height.value :
object_config.first_layer_height.get_abs_value(object_config.layer_height.value);
// If object_config.support_material_extruder == 0 resp. object_config.support_material_interface_extruder == 0,
// print_config.nozzle_diameter.get_at(size_t(-1)) returns the 0th nozzle diameter,
// which is consistent with the requirement that if support_material_extruder == 0 resp. support_material_interface_extruder == 0,
// support will not trigger tool change, but it will use the current nozzle instead.
// In that case all the nozzles have to be of the same diameter.
coordf_t support_material_extruder_dmr = print_config.nozzle_diameter.get_at(object_config.support_material_extruder.value - 1);
coordf_t support_material_interface_extruder_dmr = print_config.nozzle_diameter.get_at(object_config.support_material_interface_extruder.value - 1);
bool soluble_interface = object_config.support_material_contact_distance.value == 0.;
SlicingParameters params;
params.layer_height = object_config.layer_height.value;
params.first_print_layer_height = first_layer_height;
params.first_object_layer_height = first_layer_height;
params.object_print_z_min = 0.;
params.object_print_z_max = object_height;
params.base_raft_layers = object_config.raft_layers.value;
params.soluble_interface = soluble_interface;
// Miniumum/maximum of the minimum layer height over all extruders.
params.min_layer_height = MIN_LAYER_HEIGHT;
params.max_layer_height = std::numeric_limits<double>::max();
if (object_config.support_material.value || params.base_raft_layers > 0) {
// Has some form of support. Add the support layers to the minimum / maximum layer height limits.
params.min_layer_height = std::max(
min_layer_height_from_nozzle(print_config, object_config.support_material_extruder),
min_layer_height_from_nozzle(print_config, object_config.support_material_interface_extruder));
params.max_layer_height = std::min(
max_layer_height_from_nozzle(print_config, object_config.support_material_extruder),
max_layer_height_from_nozzle(print_config, object_config.support_material_interface_extruder));
params.max_suport_layer_height = params.max_layer_height;
}
if (object_extruders.empty()) {
params.min_layer_height = std::max(params.min_layer_height, min_layer_height_from_nozzle(print_config, 0));
params.max_layer_height = std::min(params.max_layer_height, max_layer_height_from_nozzle(print_config, 0));
} else {
for (unsigned int extruder_id : object_extruders) {
params.min_layer_height = std::max(params.min_layer_height, min_layer_height_from_nozzle(print_config, extruder_id));
params.max_layer_height = std::min(params.max_layer_height, max_layer_height_from_nozzle(print_config, extruder_id));
}
}
params.min_layer_height = std::min(params.min_layer_height, params.layer_height);
params.max_layer_height = std::max(params.max_layer_height, params.layer_height);
if (! soluble_interface) {
params.gap_raft_object = object_config.support_material_contact_distance.value;
params.gap_object_support = object_config.support_material_contact_distance.value;
params.gap_support_object = object_config.support_material_contact_distance.value;
}
if (params.base_raft_layers > 0) {
params.interface_raft_layers = (params.base_raft_layers + 1) / 2;
params.base_raft_layers -= params.interface_raft_layers;
// Use as large as possible layer height for the intermediate raft layers.
params.base_raft_layer_height = std::max(params.layer_height, 0.75 * support_material_extruder_dmr);
params.interface_raft_layer_height = std::max(params.layer_height, 0.75 * support_material_interface_extruder_dmr);
params.contact_raft_layer_height_bridging = false;
params.first_object_layer_bridging = false;
#if 1
params.contact_raft_layer_height = std::max(params.layer_height, 0.75 * support_material_interface_extruder_dmr);
if (! soluble_interface) {
// Compute the average of all nozzles used for printing the object over a raft.
//FIXME It is expected, that the 1st layer of the object is printed with a bridging flow over a full raft. Shall it not be vice versa?
coordf_t average_object_extruder_dmr = 0.;
if (! object_extruders.empty()) {
for (unsigned int extruder_id : object_extruders)
average_object_extruder_dmr += print_config.nozzle_diameter.get_at(extruder_id);
average_object_extruder_dmr /= coordf_t(object_extruders.size());
}
params.first_object_layer_height = average_object_extruder_dmr;
params.first_object_layer_bridging = true;
}
#else
params.contact_raft_layer_height = soluble_interface ? support_material_interface_extruder_dmr : 0.75 * support_material_interface_extruder_dmr;
params.contact_raft_layer_height_bridging = ! soluble_interface;
...
#endif
}
if (params.has_raft()) {
// Raise first object layer Z by the thickness of the raft itself plus the extra distance required by the support material logic.
//FIXME The last raft layer is the contact layer, which shall be printed with a bridging flow for ease of separation. Currently it is not the case.
if (params.raft_layers() == 1) {
// There is only the contact layer.
params.contact_raft_layer_height = first_layer_height;
params.raft_contact_top_z = first_layer_height;
} else {
assert(params.base_raft_layers > 0);
assert(params.interface_raft_layers > 0);
// Number of the base raft layers is decreased by the first layer.
params.raft_base_top_z = first_layer_height + coordf_t(params.base_raft_layers - 1) * params.base_raft_layer_height;
// Number of the interface raft layers is decreased by the contact layer.
params.raft_interface_top_z = params.raft_base_top_z + coordf_t(params.interface_raft_layers - 1) * params.interface_raft_layer_height;
params.raft_contact_top_z = params.raft_interface_top_z + params.contact_raft_layer_height;
}
coordf_t print_z = params.raft_contact_top_z + params.gap_raft_object;
params.object_print_z_min = print_z;
params.object_print_z_max += print_z;
}
params.valid = true;
return params;
}
// Convert layer_config_ranges to layer_height_profile. Both are referenced to z=0, meaning the raft layers are not accounted for
// in the height profile and the printed object may be lifted by the raft thickness at the time of the G-code generation.
std::vector<coordf_t> layer_height_profile_from_ranges(
const SlicingParameters &slicing_params,
const t_layer_config_ranges &layer_config_ranges)
{
// 1) If there are any height ranges, trim one by the other to make them non-overlapping. Insert the 1st layer if fixed.
std::vector<std::pair<t_layer_height_range,coordf_t>> ranges_non_overlapping;
ranges_non_overlapping.reserve(layer_config_ranges.size() * 4);
if (slicing_params.first_object_layer_height_fixed())
ranges_non_overlapping.push_back(std::pair<t_layer_height_range,coordf_t>(
t_layer_height_range(0., slicing_params.first_object_layer_height),
slicing_params.first_object_layer_height));
// The height ranges are sorted lexicographically by low / high layer boundaries.
for (t_layer_config_ranges::const_iterator it_range = layer_config_ranges.begin(); it_range != layer_config_ranges.end(); ++ it_range) {
coordf_t lo = it_range->first.first;
coordf_t hi = std::min(it_range->first.second, slicing_params.object_print_z_height());
coordf_t height = it_range->second.option("layer_height")->getFloat();
if (! ranges_non_overlapping.empty())
// Trim current low with the last high.
lo = std::max(lo, ranges_non_overlapping.back().first.second);
if (lo + EPSILON < hi)
// Ignore too narrow ranges.
ranges_non_overlapping.push_back(std::pair<t_layer_height_range,coordf_t>(t_layer_height_range(lo, hi), height));
}
// 2) Convert the trimmed ranges to a height profile, fill in the undefined intervals between z=0 and z=slicing_params.object_print_z_max()
// with slicing_params.layer_height
std::vector<coordf_t> layer_height_profile;
for (std::vector<std::pair<t_layer_height_range,coordf_t>>::const_iterator it_range = ranges_non_overlapping.begin(); it_range != ranges_non_overlapping.end(); ++ it_range) {
coordf_t lo = it_range->first.first;
coordf_t hi = it_range->first.second;
coordf_t height = it_range->second;
coordf_t last_z = layer_height_profile.empty() ? 0. : layer_height_profile[layer_height_profile.size() - 2];
if (lo > last_z + EPSILON) {
// Insert a step of normal layer height.
layer_height_profile.push_back(last_z);
layer_height_profile.push_back(slicing_params.layer_height);
layer_height_profile.push_back(lo);
layer_height_profile.push_back(slicing_params.layer_height);
}
// Insert a step of the overriden layer height.
layer_height_profile.push_back(lo);
layer_height_profile.push_back(height);
layer_height_profile.push_back(hi);
layer_height_profile.push_back(height);
}
coordf_t last_z = layer_height_profile.empty() ? 0. : layer_height_profile[layer_height_profile.size() - 2];
if (last_z < slicing_params.object_print_z_height()) {
// Insert a step of normal layer height up to the object top.
layer_height_profile.push_back(last_z);
layer_height_profile.push_back(slicing_params.layer_height);
layer_height_profile.push_back(slicing_params.object_print_z_height());
layer_height_profile.push_back(slicing_params.layer_height);
}
return layer_height_profile;
}
// Based on the work of @platsch
// Fill layer_height_profile by heights ensuring a prescribed maximum cusp height.
std::vector<double> layer_height_profile_adaptive(const SlicingParameters& slicing_params, const ModelObject& object, float quality_factor)
{
// 1) Initialize the SlicingAdaptive class with the object meshes.
SlicingAdaptive as;
as.set_slicing_parameters(slicing_params);
as.prepare(object);
// 2) Generate layers using the algorithm of @platsch
std::vector<double> layer_height_profile;
layer_height_profile.push_back(0.0);
layer_height_profile.push_back(slicing_params.first_object_layer_height);
if (slicing_params.first_object_layer_height_fixed()) {
layer_height_profile.push_back(slicing_params.first_object_layer_height);
layer_height_profile.push_back(slicing_params.first_object_layer_height);
}
double print_z = slicing_params.first_object_layer_height;
// last facet visited by the as.next_layer_height() function, where the facets are sorted by their increasing Z span.
size_t current_facet = 0;
// loop until we have at least one layer and the max slice_z reaches the object height
while (print_z + EPSILON < slicing_params.object_print_z_height()) {
float height = slicing_params.max_layer_height;
// Slic3r::debugf "\n Slice layer: %d\n", $id;
// determine next layer height
float cusp_height = as.next_layer_height(float(print_z), quality_factor, current_facet);
#if 0
// check for horizontal features and object size
if (this->config.match_horizontal_surfaces.value) {
coordf_t horizontal_dist = as.horizontal_facet_distance(print_z + height, min_layer_height);
if ((horizontal_dist < min_layer_height) && (horizontal_dist > 0)) {
#ifdef SLIC3R_DEBUG
std::cout << "Horizontal feature ahead, distance: " << horizontal_dist << std::endl;
#endif
// can we shrink the current layer a bit?
if (height-(min_layer_height - horizontal_dist) > min_layer_height) {
// yes we can
height -= (min_layer_height - horizontal_dist);
#ifdef SLIC3R_DEBUG
std::cout << "Shrink layer height to " << height << std::endl;
#endif
} else {
// no, current layer would become too thin
height += horizontal_dist;
#ifdef SLIC3R_DEBUG
std::cout << "Widen layer height to " << height << std::endl;
#endif
}
}
}
#endif
height = std::min(cusp_height, height);
// apply z-gradation
/*
my $gradation = $self->config->get_value('adaptive_slicing_z_gradation');
if($gradation > 0) {
$height = $height - unscale((scale($height)) % (scale($gradation)));
}
*/
// look for an applicable custom range
/*
if (my $range = first { $_->[0] <= $print_z && $_->[1] > $print_z } @{$self->layer_height_ranges}) {
$height = $range->[2];
# if user set custom height to zero we should just skip the range and resume slicing over it
if ($height == 0) {
$print_z += $range->[1] - $range->[0];
next;
}
}
*/
layer_height_profile.push_back(print_z);
layer_height_profile.push_back(height);
print_z += height;
}
double z_gap = slicing_params.object_print_z_height() - layer_height_profile[layer_height_profile.size() - 2];
if (z_gap > 0.0)
{
layer_height_profile.push_back(slicing_params.object_print_z_height());
layer_height_profile.push_back(clamp(slicing_params.min_layer_height, slicing_params.max_layer_height, z_gap));
}
return layer_height_profile;
}
std::vector<double> smooth_height_profile(const std::vector<double>& profile, const SlicingParameters& slicing_params, const HeightProfileSmoothingParams& smoothing_params)
{
auto gauss_blur = [&slicing_params](const std::vector<double>& profile, const HeightProfileSmoothingParams& smoothing_params) -> std::vector<double> {
auto gauss_kernel = [] (unsigned int radius) -> std::vector<double> {
unsigned int size = 2 * radius + 1;
std::vector<double> ret;
ret.reserve(size);
// Reworked from static inline int getGaussianKernelSize(float sigma) taken from opencv-4.1.2\modules\features2d\src\kaze\AKAZEFeatures.cpp
double sigma = 0.3 * (double)(radius - 1) + 0.8;
double two_sq_sigma = 2.0 * sigma * sigma;
double inv_root_two_pi_sq_sigma = 1.0 / ::sqrt(M_PI * two_sq_sigma);
for (unsigned int i = 0; i < size; ++i)
{
double x = (double)i - (double)radius;
ret.push_back(inv_root_two_pi_sq_sigma * ::exp(-x * x / two_sq_sigma));
}
return ret;
};
// skip first layer ?
size_t skip_count = slicing_params.first_object_layer_height_fixed() ? 4 : 0;
// not enough data to smmoth
if ((int)profile.size() - (int)skip_count < 6)
return profile;
unsigned int radius = std::max(smoothing_params.radius, (unsigned int)1);
std::vector<double> kernel = gauss_kernel(radius);
int two_radius = 2 * (int)radius;
std::vector<double> ret;
size_t size = profile.size();
ret.reserve(size);
// leave first layer untouched
for (size_t i = 0; i < skip_count; ++i)
{
ret.push_back(profile[i]);
}
// smooth the rest of the profile by biasing a gaussian blur
// the bias moves the smoothed profile closer to the min_layer_height
double delta_h = slicing_params.max_layer_height - slicing_params.min_layer_height;
double inv_delta_h = (delta_h != 0.0) ? 1.0 / delta_h : 1.0;
double max_dz_band = (double)radius * slicing_params.layer_height;
for (size_t i = skip_count; i < size; i += 2)
{
double zi = profile[i];
double hi = profile[i + 1];
ret.push_back(zi);
ret.push_back(0.0);
double& height = ret.back();
int begin = std::max((int)i - two_radius, (int)skip_count);
int end = std::min((int)i + two_radius, (int)size - 2);
double weight_total = 0.0;
for (int j = begin; j <= end; j += 2)
{
int kernel_id = radius + (j - (int)i) / 2;
double dz = std::abs(zi - profile[j]);
if (dz * slicing_params.layer_height <= max_dz_band)
{
double dh = std::abs(slicing_params.max_layer_height - profile[j + 1]);
double weight = kernel[kernel_id] * sqrt(dh * inv_delta_h);
height += weight * profile[j + 1];
weight_total += weight;
}
}
height = clamp(slicing_params.min_layer_height, slicing_params.max_layer_height, (weight_total != 0.0) ? height /= weight_total : hi);
if (smoothing_params.keep_min)
height = std::min(height, hi);
}
return ret;
};
return gauss_blur(profile, smoothing_params);
}
void adjust_layer_height_profile(
const SlicingParameters &slicing_params,
std::vector<coordf_t> &layer_height_profile,
coordf_t z,
coordf_t layer_thickness_delta,
coordf_t band_width,
LayerHeightEditActionType action)
{
// Constrain the profile variability by the 1st layer height.
std::pair<coordf_t, coordf_t> z_span_variable =
std::pair<coordf_t, coordf_t>(
slicing_params.first_object_layer_height_fixed() ? slicing_params.first_object_layer_height : 0.,
slicing_params.object_print_z_height());
if (z < z_span_variable.first || z > z_span_variable.second)
return;
assert(layer_height_profile.size() >= 2);
assert(std::abs(layer_height_profile[layer_height_profile.size() - 2] - slicing_params.object_print_z_height()) < EPSILON);
// 1) Get the current layer thickness at z.
coordf_t current_layer_height = slicing_params.layer_height;
for (size_t i = 0; i < layer_height_profile.size(); i += 2) {
if (i + 2 == layer_height_profile.size()) {
current_layer_height = layer_height_profile[i + 1];
break;
} else if (layer_height_profile[i + 2] > z) {
coordf_t z1 = layer_height_profile[i];
coordf_t h1 = layer_height_profile[i + 1];
coordf_t z2 = layer_height_profile[i + 2];
coordf_t h2 = layer_height_profile[i + 3];
current_layer_height = lerp(h1, h2, (z - z1) / (z2 - z1));
break;
}
}
// 2) Is it possible to apply the delta?
switch (action) {
case LAYER_HEIGHT_EDIT_ACTION_DECREASE:
layer_thickness_delta = - layer_thickness_delta;
// fallthrough
case LAYER_HEIGHT_EDIT_ACTION_INCREASE:
if (layer_thickness_delta > 0) {
if (current_layer_height >= slicing_params.max_layer_height - EPSILON)
return;
layer_thickness_delta = std::min(layer_thickness_delta, slicing_params.max_layer_height - current_layer_height);
} else {
if (current_layer_height <= slicing_params.min_layer_height + EPSILON)
return;
layer_thickness_delta = std::max(layer_thickness_delta, slicing_params.min_layer_height - current_layer_height);
}
break;
case LAYER_HEIGHT_EDIT_ACTION_REDUCE:
case LAYER_HEIGHT_EDIT_ACTION_SMOOTH:
layer_thickness_delta = std::abs(layer_thickness_delta);
layer_thickness_delta = std::min(layer_thickness_delta, std::abs(slicing_params.layer_height - current_layer_height));
if (layer_thickness_delta < EPSILON)
return;
break;
default:
assert(false);
break;
}
// 3) Densify the profile inside z +- band_width/2, remove duplicate Zs from the height profile inside the band.
coordf_t lo = std::max(z_span_variable.first, z - 0.5 * band_width);
// Do not limit the upper side of the band, so that the modifications to the top point of the profile will be allowed.
coordf_t hi = z + 0.5 * band_width;
coordf_t z_step = 0.1;
size_t idx = 0;
while (idx < layer_height_profile.size() && layer_height_profile[idx] < lo)
idx += 2;
idx -= 2;
std::vector<double> profile_new;
profile_new.reserve(layer_height_profile.size());
assert(idx >= 0 && idx + 1 < layer_height_profile.size());
profile_new.insert(profile_new.end(), layer_height_profile.begin(), layer_height_profile.begin() + idx + 2);
coordf_t zz = lo;
size_t i_resampled_start = profile_new.size();
while (zz < hi) {
size_t next = idx + 2;
coordf_t z1 = layer_height_profile[idx];
coordf_t h1 = layer_height_profile[idx + 1];
coordf_t height = h1;
if (next < layer_height_profile.size()) {
coordf_t z2 = layer_height_profile[next];
coordf_t h2 = layer_height_profile[next + 1];
height = lerp(h1, h2, (zz - z1) / (z2 - z1));
}
// Adjust height by layer_thickness_delta.
coordf_t weight = std::abs(zz - z) < 0.5 * band_width ? (0.5 + 0.5 * cos(2. * M_PI * (zz - z) / band_width)) : 0.;
switch (action) {
case LAYER_HEIGHT_EDIT_ACTION_INCREASE:
case LAYER_HEIGHT_EDIT_ACTION_DECREASE:
height += weight * layer_thickness_delta;
break;
case LAYER_HEIGHT_EDIT_ACTION_REDUCE:
{
coordf_t delta = height - slicing_params.layer_height;
coordf_t step = weight * layer_thickness_delta;
step = (std::abs(delta) > step) ?
(delta > 0) ? -step : step :
-delta;
height += step;
break;
}
case LAYER_HEIGHT_EDIT_ACTION_SMOOTH:
{
// Don't modify the profile during resampling process, do it at the next step.
break;
}
default:
assert(false);
break;
}
height = clamp(slicing_params.min_layer_height, slicing_params.max_layer_height, height);
if (zz == z_span_variable.second) {
// This is the last point of the profile.
if (profile_new[profile_new.size() - 2] + EPSILON > zz) {
profile_new.pop_back();
profile_new.pop_back();
}
profile_new.push_back(zz);
profile_new.push_back(height);
idx = layer_height_profile.size();
break;
}
// Avoid entering a too short segment.
if (profile_new[profile_new.size() - 2] + EPSILON < zz) {
profile_new.push_back(zz);
profile_new.push_back(height);
}
// Limit zz to the object height, so the next iteration the last profile point will be set.
zz = std::min(zz + z_step, z_span_variable.second);
idx = next;
while (idx < layer_height_profile.size() && layer_height_profile[idx] < zz)
idx += 2;
idx -= 2;
}
idx += 2;
assert(idx > 0);
size_t i_resampled_end = profile_new.size();
if (idx < layer_height_profile.size()) {
assert(zz >= layer_height_profile[idx - 2]);
assert(zz <= layer_height_profile[idx]);
profile_new.insert(profile_new.end(), layer_height_profile.begin() + idx, layer_height_profile.end());
}
else if (profile_new[profile_new.size() - 2] + 0.5 * EPSILON < z_span_variable.second) {
profile_new.insert(profile_new.end(), layer_height_profile.end() - 2, layer_height_profile.end());
}
layer_height_profile = std::move(profile_new);
if (action == LAYER_HEIGHT_EDIT_ACTION_SMOOTH) {
if (i_resampled_start == 0)
++ i_resampled_start;
if (i_resampled_end == layer_height_profile.size())
i_resampled_end -= 2;
size_t n_rounds = 6;
for (size_t i_round = 0; i_round < n_rounds; ++ i_round) {
profile_new = layer_height_profile;
for (size_t i = i_resampled_start; i < i_resampled_end; i += 2) {
coordf_t zz = profile_new[i];
coordf_t t = std::abs(zz - z) < 0.5 * band_width ? (0.25 + 0.25 * cos(2. * M_PI * (zz - z) / band_width)) : 0.;
assert(t >= 0. && t <= 0.5000001);
if (i == 0)
layer_height_profile[i + 1] = (1. - t) * profile_new[i + 1] + t * profile_new[i + 3];
else if (i + 1 == profile_new.size())
layer_height_profile[i + 1] = (1. - t) * profile_new[i + 1] + t * profile_new[i - 1];
else
layer_height_profile[i + 1] = (1. - t) * profile_new[i + 1] + 0.5 * t * (profile_new[i - 1] + profile_new[i + 3]);
}
}
}
assert(layer_height_profile.size() > 2);
assert(layer_height_profile.size() % 2 == 0);
assert(layer_height_profile[0] == 0.);
assert(std::abs(layer_height_profile[layer_height_profile.size() - 2] - slicing_params.object_print_z_height()) < EPSILON);
#ifdef _DEBUG
for (size_t i = 2; i < layer_height_profile.size(); i += 2)
assert(layer_height_profile[i - 2] <= layer_height_profile[i]);
for (size_t i = 1; i < layer_height_profile.size(); i += 2) {
assert(layer_height_profile[i] > slicing_params.min_layer_height - EPSILON);
assert(layer_height_profile[i] < slicing_params.max_layer_height + EPSILON);
}
#endif /* _DEBUG */
}
// Produce object layers as pairs of low / high layer boundaries, stored into a linear vector.
std::vector<coordf_t> generate_object_layers(
const SlicingParameters &slicing_params,
const std::vector<coordf_t> &layer_height_profile)
{
assert(! layer_height_profile.empty());
coordf_t print_z = 0;
coordf_t height = 0;
std::vector<coordf_t> out;
if (slicing_params.first_object_layer_height_fixed()) {
out.push_back(0);
print_z = slicing_params.first_object_layer_height;
out.push_back(print_z);
}
size_t idx_layer_height_profile = 0;
// loop until we have at least one layer and the max slice_z reaches the object height
coordf_t slice_z = print_z + 0.5 * slicing_params.min_layer_height;
while (slice_z < slicing_params.object_print_z_height()) {
height = slicing_params.min_layer_height;
if (idx_layer_height_profile < layer_height_profile.size()) {
size_t next = idx_layer_height_profile + 2;
for (;;) {
if (next >= layer_height_profile.size() || slice_z < layer_height_profile[next])
break;
idx_layer_height_profile = next;
next += 2;
}
coordf_t z1 = layer_height_profile[idx_layer_height_profile];
coordf_t h1 = layer_height_profile[idx_layer_height_profile + 1];
height = h1;
if (next < layer_height_profile.size()) {
coordf_t z2 = layer_height_profile[next];
coordf_t h2 = layer_height_profile[next + 1];
height = lerp(h1, h2, (slice_z - z1) / (z2 - z1));
assert(height >= slicing_params.min_layer_height - EPSILON && height <= slicing_params.max_layer_height + EPSILON);
}
}
slice_z = print_z + 0.5 * height;
if (slice_z >= slicing_params.object_print_z_height())
break;
assert(height > slicing_params.min_layer_height - EPSILON);
assert(height < slicing_params.max_layer_height + EPSILON);
out.push_back(print_z);
print_z += height;
slice_z = print_z + 0.5 * slicing_params.min_layer_height;
out.push_back(print_z);
}
//FIXME Adjust the last layer to align with the top object layer exactly?
return out;
}
int generate_layer_height_texture(
const SlicingParameters &slicing_params,
const std::vector<coordf_t> &layers,
void *data, int rows, int cols, bool level_of_detail_2nd_level)
{
// https://github.com/aschn/gnuplot-colorbrewer
std::vector<Vec3crd> palette_raw;
palette_raw.push_back(Vec3crd(0x01A, 0x098, 0x050));
palette_raw.push_back(Vec3crd(0x066, 0x0BD, 0x063));
palette_raw.push_back(Vec3crd(0x0A6, 0x0D9, 0x06A));
palette_raw.push_back(Vec3crd(0x0D9, 0x0F1, 0x0EB));
palette_raw.push_back(Vec3crd(0x0FE, 0x0E6, 0x0EB));
palette_raw.push_back(Vec3crd(0x0FD, 0x0AE, 0x061));
palette_raw.push_back(Vec3crd(0x0F4, 0x06D, 0x043));
palette_raw.push_back(Vec3crd(0x0D7, 0x030, 0x027));
// Clear the main texture and the 2nd LOD level.
// memset(data, 0, rows * cols * (level_of_detail_2nd_level ? 5 : 4));
// 2nd LOD level data start
unsigned char *data1 = reinterpret_cast<unsigned char*>(data) + rows * cols * 4;
int ncells = std::min((cols-1) * rows, int(ceil(16. * (slicing_params.object_print_z_height() / slicing_params.min_layer_height))));
int ncells1 = ncells / 2;
int cols1 = cols / 2;
coordf_t z_to_cell = coordf_t(ncells-1) / slicing_params.object_print_z_height();
coordf_t cell_to_z = slicing_params.object_print_z_height() / coordf_t(ncells-1);
coordf_t z_to_cell1 = coordf_t(ncells1-1) / slicing_params.object_print_z_height();
// for color scaling
coordf_t hscale = 2.f * std::max(slicing_params.max_layer_height - slicing_params.layer_height, slicing_params.layer_height - slicing_params.min_layer_height);
if (hscale == 0)
// All layers have the same height. Provide some height scale to avoid division by zero.
hscale = slicing_params.layer_height;
for (size_t idx_layer = 0; idx_layer < layers.size(); idx_layer += 2) {
coordf_t lo = layers[idx_layer];
coordf_t hi = layers[idx_layer + 1];
coordf_t mid = 0.5f * (lo + hi);
assert(mid <= slicing_params.object_print_z_height());
coordf_t h = hi - lo;
hi = std::min(hi, slicing_params.object_print_z_height());
int cell_first = clamp(0, ncells-1, int(ceil(lo * z_to_cell)));
int cell_last = clamp(0, ncells-1, int(floor(hi * z_to_cell)));
for (int cell = cell_first; cell <= cell_last; ++ cell) {
coordf_t idxf = (0.5 * hscale + (h - slicing_params.layer_height)) * coordf_t(palette_raw.size()-1) / hscale;
int idx1 = clamp(0, int(palette_raw.size() - 1), int(floor(idxf)));
int idx2 = std::min(int(palette_raw.size() - 1), idx1 + 1);
coordf_t t = idxf - coordf_t(idx1);
const Vec3crd &color1 = palette_raw[idx1];
const Vec3crd &color2 = palette_raw[idx2];
coordf_t z = cell_to_z * coordf_t(cell);
assert(lo - EPSILON <= z && z <= hi + EPSILON);
// Intensity profile to visualize the layers.
coordf_t intensity = cos(M_PI * 0.7 * (mid - z) / h);
// Color mapping from layer height to RGB.
Vec3d color(
intensity * lerp(coordf_t(color1(0)), coordf_t(color2(0)), t),
intensity * lerp(coordf_t(color1(1)), coordf_t(color2(1)), t),
intensity * lerp(coordf_t(color1(2)), coordf_t(color2(2)), t));
int row = cell / (cols - 1);
int col = cell - row * (cols - 1);
assert(row >= 0 && row < rows);
assert(col >= 0 && col < cols);
unsigned char *ptr = (unsigned char*)data + (row * cols + col) * 4;
ptr[0] = (unsigned char)clamp<int>(0, 255, int(floor(color(0) + 0.5)));
ptr[1] = (unsigned char)clamp<int>(0, 255, int(floor(color(1) + 0.5)));
ptr[2] = (unsigned char)clamp<int>(0, 255, int(floor(color(2) + 0.5)));
ptr[3] = 255;
if (col == 0 && row > 0) {
// Duplicate the first value in a row as a last value of the preceding row.
ptr[-4] = ptr[0];
ptr[-3] = ptr[1];
ptr[-2] = ptr[2];
ptr[-1] = ptr[3];
}
}
if (level_of_detail_2nd_level) {
cell_first = clamp(0, ncells1-1, int(ceil(lo * z_to_cell1)));
cell_last = clamp(0, ncells1-1, int(floor(hi * z_to_cell1)));
for (int cell = cell_first; cell <= cell_last; ++ cell) {
coordf_t idxf = (0.5 * hscale + (h - slicing_params.layer_height)) * coordf_t(palette_raw.size()-1) / hscale;
int idx1 = clamp(0, int(palette_raw.size() - 1), int(floor(idxf)));
int idx2 = std::min(int(palette_raw.size() - 1), idx1 + 1);
coordf_t t = idxf - coordf_t(idx1);
const Vec3crd &color1 = palette_raw[idx1];
const Vec3crd &color2 = palette_raw[idx2];
// Color mapping from layer height to RGB.
Vec3d color(
lerp(coordf_t(color1(0)), coordf_t(color2(0)), t),
lerp(coordf_t(color1(1)), coordf_t(color2(1)), t),
lerp(coordf_t(color1(2)), coordf_t(color2(2)), t));
int row = cell / (cols1 - 1);
int col = cell - row * (cols1 - 1);
assert(row >= 0 && row < rows/2);
assert(col >= 0 && col < cols/2);
unsigned char *ptr = data1 + (row * cols1 + col) * 4;
ptr[0] = (unsigned char)clamp<int>(0, 255, int(floor(color(0) + 0.5)));
ptr[1] = (unsigned char)clamp<int>(0, 255, int(floor(color(1) + 0.5)));
ptr[2] = (unsigned char)clamp<int>(0, 255, int(floor(color(2) + 0.5)));
ptr[3] = 255;
if (col == 0 && row > 0) {
// Duplicate the first value in a row as a last value of the preceding row.
ptr[-4] = ptr[0];
ptr[-3] = ptr[1];
ptr[-2] = ptr[2];
ptr[-1] = ptr[3];
}
}
}
}
// Returns number of cells of the 0th LOD level.
return ncells;
}
}; // namespace Slic3r