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Elephant foot compensation improvements.

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Fix of the negative XY compensation on multi-material (or multi-region)
prints, where the negative XY compensation created gaps between parts.
This commit is contained in:
bubnikv 2019-03-05 11:54:04 +01:00
parent c56004f946
commit 5e582efc5c
5 changed files with 139 additions and 27 deletions
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99
src/libslic3r/PrintObject.cpp
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@ -1551,32 +1551,89 @@ end:
Layer *layer = m_layers[layer_id];
// Apply size compensation and perform clipping of multi-part objects.
float delta = float(scale_(m_config.xy_size_compensation.value));
float elephant_foot_compensation = 0.f;
if (layer_id == 0)
delta -= float(scale_(m_config.elefant_foot_compensation.value));
bool scale = delta != 0.f;
bool clip = m_config.clip_multipart_objects.value || delta > 0.f;
elephant_foot_compensation = float(scale_(m_config.elefant_foot_compensation.value));
if (layer->m_regions.size() == 1) {
if (scale) {
// Optimized version for a single region layer.
if (layer_id == 0) {
if (delta > elephant_foot_compensation) {
delta -= elephant_foot_compensation;
elephant_foot_compensation = 0.f;
} else if (delta > 0)
elephant_foot_compensation -= delta;
}
if (delta != 0.f || elephant_foot_compensation > 0.f) {
// Single region, growing or shrinking.
LayerRegion *layerm = layer->m_regions.front();
layerm->slices.set(offset_ex(to_expolygons(std::move(layerm->slices.surfaces)), delta), stInternal);
// Apply the XY compensation.
ExPolygons expolygons = (delta == 0.f) ?
to_expolygons(std::move(layerm->slices.surfaces)) :
offset_ex(to_expolygons(std::move(layerm->slices.surfaces)), delta);
// Apply the elephant foot compensation.
if (elephant_foot_compensation > 0) {
float elephant_foot_spacing = layerm->flow(frExternalPerimeter).scaled_elephant_foot_spacing();
float external_perimeter_nozzle = scale_(this->print()->config().nozzle_diameter.get_at(layerm->region()->config().perimeter_extruder.value - 1));
// Apply the elephant foot compensation by steps of 1/10 nozzle diameter.
float steps = std::ceil(elephant_foot_compensation / (0.1f * external_perimeter_nozzle));
size_t nsteps = size_t(steps);
float step = elephant_foot_compensation / steps;
for (size_t i = 0; i < nsteps; ++ i) {
Polygons tmp = offset(expolygons, - step);
append(tmp, diff(to_polygons(expolygons), offset(offset_ex(expolygons, -elephant_foot_spacing - step), elephant_foot_spacing + step)));
expolygons = union_ex(tmp);
}
}
layerm->slices.set(std::move(expolygons), stInternal);
}
} else if (scale || clip) {
// Multiple regions, growing, shrinking or just clipping one region by the other.
// When clipping the regions, priority is given to the first regions.
Polygons processed;
for (size_t region_id = 0; region_id < layer->m_regions.size(); ++ region_id) {
LayerRegion *layerm = layer->m_regions[region_id];
ExPolygons slices = to_expolygons(std::move(layerm->slices.surfaces));
if (scale)
slices = offset_ex(slices, delta);
if (region_id > 0 && clip)
// Trim by the slices of already processed regions.
slices = diff_ex(to_polygons(std::move(slices)), processed);
if (clip && region_id + 1 < layer->m_regions.size())
// Collect the already processed regions to trim the to be processed regions.
polygons_append(processed, slices);
layerm->slices.set(std::move(slices), stInternal);
} else {
bool upscale = delta > 0.f;
bool downscale = delta < 0.f || elephant_foot_compensation > 0.f;
bool clip = m_config.clip_multipart_objects.value;
if (upscale || clip) {
// Multiple regions, growing or just clipping one region by the other.
// When clipping the regions, priority is given to the first regions.
Polygons processed;
for (size_t region_id = 0; region_id < layer->m_regions.size(); ++ region_id) {
LayerRegion *layerm = layer->m_regions[region_id];
ExPolygons slices = to_expolygons(std::move(layerm->slices.surfaces));
if (upscale)
slices = offset_ex(std::move(slices), delta);
if (region_id > 0 && clip)
// Trim by the slices of already processed regions.
slices = diff_ex(to_polygons(std::move(slices)), processed);
if (clip && (region_id + 1 < layer->m_regions.size()))
// Collect the already processed regions to trim the to be processed regions.
polygons_append(processed, slices);
layerm->slices.set(std::move(slices), stInternal);
}
}
if (delta < 0.f) {
// Apply the negative XY compensation.
Polygons trimming = offset(layer->merged(EPSILON), delta - EPSILON);
for (size_t region_id = 0; region_id < layer->m_regions.size(); ++ region_id)
layer->m_regions[region_id]->trim_surfaces(trimming);
}
if (elephant_foot_compensation > 0.f) {
// Apply the elephant foot compensation.
std::vector<float> elephant_foot_spacing;
elephant_foot_spacing.reserve(layer->m_regions.size());
float external_perimeter_nozzle = 0.f;
for (size_t region_id = 0; region_id < layer->m_regions.size(); ++ region_id) {
LayerRegion *layerm = layer->m_regions[region_id];
elephant_foot_spacing.emplace_back(layerm->flow(frExternalPerimeter).scaled_elephant_foot_spacing());
external_perimeter_nozzle += scale_(this->print()->config().nozzle_diameter.get_at(layerm->region()->config().perimeter_extruder.value - 1));
}
external_perimeter_nozzle /= (float)layer->m_regions.size();
// Apply the elephant foot compensation by steps of 1/10 nozzle diameter.
float steps = std::ceil(elephant_foot_compensation / (0.1f * external_perimeter_nozzle));
size_t nsteps = size_t(steps);
float step = elephant_foot_compensation / steps;
for (size_t i = 0; i < nsteps; ++ i) {
Polygons trimming_polygons = offset(layer->merged(EPSILON), - step - EPSILON);
for (size_t region_id = 0; region_id < layer->m_regions.size(); ++ region_id)
layer->m_regions[region_id]->elephant_foot_compensation_step(elephant_foot_spacing[region_id] + step, trimming_polygons);
}
}
}
// Merge all regions' slices to get islands, chain them by a shortest path.