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Fix rare crash when calculating bridge expansion (#9287)

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* Fix #12469 - crash caused by bridge expansion.

Handle a very rare case in which the algorithm picks a wrong
polygon for expansion seed.

(cherry picked from commit 5f843cc93470c96483abcbd47cf8ee5fe38dffe2)

* SPE-2698: Fix crash during regions expansion.

(cherry picked from commit a3f75133c8baead6f8d7bb01722a6bfcdc2e9038)

---------

Co-authored-by: Martin Šach <martin.sachin@gmail.com>
Co-authored-by: Lukáš Hejl <hejl.lukas@gmail.com>
This commit is contained in:
Noisyfox 2025-04-13 17:39:28 +08:00 committed by GitHub
parent 7a40ebda66
commit 8e38ac234f
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1 changed files with 21 additions and 2 deletions
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23
src/libslic3r/Algorithm/RegionExpansion.cpp
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@ -258,14 +258,33 @@ std::vector<WaveSeed> wave_seeds(
int iseed = 0;
for (const ClipperLib_Z::Path &path : segments) {
assert(path.size() >= 2);
const ClipperLib_Z::IntPoint &front = path.front();
const ClipperLib_Z::IntPoint &back = path.back();
ClipperLib_Z::IntPoint front = path.front();
ClipperLib_Z::IntPoint back = path.back();
// Both ends of a seed segment are supposed to be inside a single boundary expolygon.
// Thus as long as the seed contour is not closed, it should be open at a boundary point.
assert((front == back && front.z() >= idx_boundary_end && front.z() < idx_src_end) ||
//(front.z() < 0 && back.z() < 0));
// Hope that at least one end of an open polyline is clipped by the boundary, thus an intersection point is created.
(front.z() < 0 || back.z() < 0));
if (front != back && front.z() >= 0 && back.z() >= 0) {
// Very rare case when both endpoints intersect boundary ExPolygons in existing points.
// So the ZFillFunction callback hasn't been called.
continue;
} else
if (front == back && (front.z() < idx_boundary_end)) {
// This should be a very rare exception.
// See https://github.com/prusa3d/PrusaSlicer/issues/12469.
// Segement is open, yet its first point seems to be part of boundary polygon.
// Take the first point with src polygon index.
for (const ClipperLib_Z::IntPoint &point : path) {
if (point.z() >= idx_boundary_end) {
front = point;
back = point;
}
}
}
const Intersection *intersection = nullptr;
auto intersection_point_valid = [idx_boundary_end, idx_src_end](const Intersection &is) {
return is.first >= 1 && is.first < idx_boundary_end &&