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Fix missing overhang wall when no partial counterbore bridge is generated (#15100)

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This commit is contained in:
Kiss Lorand
2026-08-04 00:02:48 +03:00
committed by GitHub
parent 7b404596e9
commit ca7fbfb007
1 changed files with 17 additions and 12 deletions
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29
src/libslic3r/PerimeterGenerator.cpp
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@@ -1977,7 +1977,7 @@ void PerimeterGenerator::process_no_bridge(Surfaces& all_surfaces, coord_t perim
ExPolygons unsupported = diff_ex(last, *this->lower_slices, ApplySafetyOffset::Yes);
if (!unsupported.empty()) {
//remove small overhangs
ExPolygons unsupported_filtered = offset2_ex(unsupported, double(-perimeter_spacing), double(perimeter_spacing));
ExPolygons unsupported_filtered = opening_ex(unsupported, perimeter_spacing);
if (!unsupported_filtered.empty()) {
//to_draw.insert(to_draw.end(), last.begin(), last.end());
@@ -2090,35 +2090,40 @@ void PerimeterGenerator::process_no_bridge(Surfaces& all_surfaces, coord_t perim
//TODO: add other polys as holes inside this one (-margin)
} else { // if(this->config->counterbore_hole_bridging.value == chbBridges)
// Orca: Partial counterbore bridging is mask-based. Preserve the supported
// remainder (`last`) and use simplified BridgeDetector coverage to derive the
// remainder and use simplified BridgeDetector coverage to derive the
// bridgeable counterbore span. The span is grown from supported material,
// shrunk back, stripped from `last`, and expanded back. It is then prevented
// from intruding deeper into `last` than the explicit anchor overlap.
// Finally, add the allowed anchor band from `last` then remove the
// shrunk back, stripped from the remaining normal surface, and expanded back.
// It is then prevented from intruding deeper into it than the explicit anchor overlap.
// Finally, add the allowed anchor band from it then remove the
// narrow hole-side wall contact, which must remain unbridgeable.
last = diff_ex(last, unsupported_filtered, ApplySafetyOffset::Yes);
const ExPolygons remaining = diff_ex(last, unsupported_filtered, ApplySafetyOffset::Yes);
ExPolygons bridgeable_filtered;
for (ExPolygon& poly : bridgeable) {
poly.simplify(perimeter_spacing, &bridgeable_filtered);
}
bridgeable_filtered = opening_ex(bridgeable_filtered, ext_perimeter_width);
// Get rid of coarseness of the resulted bridgeable area by using the original supported area as reference.
// This is to avoid keeping tiny bridgeable areas that are far from the supported area, or protrude into it.
bridgeable_filtered = union_ex(offset_ex(last, perimeter_spacing), bridgeable_filtered);
// This is to avoid keeping tiny bridgeable areas that are far from the supported area, or protrude into it.
bridgeable_filtered = union_ex(offset_ex(remaining, perimeter_spacing), bridgeable_filtered);
bridgeable_filtered = offset_ex(bridgeable_filtered, -perimeter_spacing);
bridgeable_filtered = diff_ex(bridgeable_filtered, last, ApplySafetyOffset::Yes);
bridgeable_filtered = diff_ex(bridgeable_filtered, remaining, ApplySafetyOffset::Yes);
bridgeable_filtered = opening_ex(bridgeable_filtered, perimeter_spacing); // filter noise from the diff_ex
bridgeable_filtered = offset_ex(bridgeable_filtered, perimeter_spacing); // restore the size to the original bridgeable area
// Safety measure: Keep the bridge mask from intruding deeper into the
// supported anchor region (`last`) than the explicit anchor overlap.
bridgeable_filtered = diff_ex(bridgeable_filtered, offset_ex(last, -bridge_anchor_offset));
// supported anchor region than the explicit anchor overlap.
bridgeable_filtered = diff_ex(bridgeable_filtered, offset_ex(remaining, -bridge_anchor_offset));
ExPolygons bridge_anchor_areas = intersection_ex(last, offset_ex(unsupported_filtered, bridge_anchor_offset));
ExPolygons bridge_anchor_areas = intersection_ex(remaining, offset_ex(unsupported_filtered, bridge_anchor_offset));
unsupported_filtered = union_ex(bridgeable_filtered, bridge_anchor_areas); // add bridge anchor
unsupported_filtered = opening_ex(unsupported_filtered, bridge_anchor_offset); // remove anchor area from hole-side walls, it must remain unbridgeable
// update 'last' only if we have a valid bridgeable area, otherwise we will lose the original unsupported area
if (!unsupported_filtered.empty())
last = remaining;
// TODO: Fix the case with thin outer walls around the bridge (1~2 walls) where classic wall
// might generate two walls in a tiny space or non at all if "Detect thin walls" is not activated
}