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Merge tiny cracks that is part of a large bottom surface into bottom surface (#9332)

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* Merge tiny cracks that is part of a large bottom surface into bottom surface (SoftFever/OrcaSlicer#9329)

* Revert bottom offset

* Top surfaces will have perimeters around, which need to be removed from bottom surfaces so bridges not extended to visible areas
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Noisyfox 2025-04-29 22:19:30 +08:00 • committed by GitHub
parent a499695c93
commit 940800b059
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GPG key ID: B5690EEEBB952194
1 changed files with 14 additions and 7 deletions
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21
src/libslic3r/PrintObject.cpp
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@ -1309,8 +1309,7 @@ void PrintObject::detect_surfaces_type()
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)
const float offset_top = layerm->flow(frExternalPerimeter).scaled_width() / 10.f;
const float offset_bottom = layerm->flow(frExternalPerimeter).scaled_width();
const float offset = layerm->flow(frExternalPerimeter).scaled_width() / 10.f;
ExPolygons layerm_slices_surfaces = to_expolygons(layerm->slices.surfaces);
// no_perimeter_full_bridge allow to put bridges where there are nothing, hence adding area to slice, that's why we need to start from the result of PerimeterGenerator.
@ -1325,7 +1324,7 @@ void PrintObject::detect_surfaces_type()
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_top), stTop);
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
@ -1351,7 +1350,7 @@ void PrintObject::detect_surfaces_type()
bottom,
opening_ex(
diff_ex(layerm_slices_surfaces, lower_layer->lslices, ApplySafetyOffset::Yes),
offset_bottom),
offset),
surface_type_bottom_other);
// if user requested internal shells, we need to identify surfaces
// lying on other slices not belonging to this region
@ -1365,7 +1364,7 @@ void PrintObject::detect_surfaces_type()
intersection(layerm_slices_surfaces, lower_layer->lslices), // supported
lower_layer->m_regions[region_id]->slices.surfaces,
ApplySafetyOffset::Yes),
offset_bottom),
offset),
stBottom);
}
#endif
@ -1383,14 +1382,22 @@ void PrintObject::detect_surfaces_type()
if (! top.empty() && ! bottom.empty()) {
const auto cracks = intersection_ex(top, bottom);
if (!cracks.empty()) {
const float small_crack_threshold = -offset_bottom;
const float small_crack_threshold = -layerm->flow(frExternalPerimeter).scaled_width() * 1.5;
for (const auto& crack : cracks) {
if (offset_ex(crack, small_crack_threshold).empty()) {
// For small cracks, if it's part of a large bottom surface, then it should be added to bottom as well
if (std::any_of(bottom.begin(), bottom.end(), [&crack, small_crack_threshold](const Surface& s) {
const auto& se = s.expolygon;
return diff_ex(crack, se, ApplySafetyOffset::Yes).empty()
&& se.area() > crack.area() * 2
&& !offset_ex(diff_ex(se, crack), small_crack_threshold).empty();
})) continue;
// Crack too small, leave it as part of the top surface, remove it from bottom surfaces
Surfaces bot_tmp;
for (auto& b : bottom) {
surfaces_append(bot_tmp, diff_ex(b.expolygon, crack), b.surface_type);
surfaces_append(bot_tmp, diff_ex(b.expolygon, offset_ex(crack, -small_crack_threshold)), b.surface_type);
}
bottom = std::move(bot_tmp);
}