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SPE-2630: Fixed CSG operations on meshes splittable to parts with inward-facing normals (#13786)

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This commit is contained in:
Lukas Matena 2025-01-15 15:48:06 +01:00
parent 5938fdb495
commit 963f96b31f
1 changed files with 24 additions and 11 deletions
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33
src/libslic3r/CSGMesh/ModelToCSGMesh.hpp
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@ -46,17 +46,30 @@ void model_to_csgmesh(const ModelObject &mo,
*out = std::move(part_begin);
++out;
its_split(vol->mesh().its, SplitOutputFn{[&out, &vol, &trafo](indexed_triangle_set &&its) {
if (its.empty())
return;
// Collect partial meshes and keep outward and inward facing meshes separately.
std::vector<indexed_triangle_set> meshes_union;
std::vector<indexed_triangle_set> meshes_difference;
its_split(vol->mesh().its, SplitOutputFn{[&meshes_union, &meshes_difference](indexed_triangle_set &&its) {
if (its.empty())
return;
if (its_volume(its) >= 0.f)
meshes_union.emplace_back(std::move(its));
else {
its_flip_triangles(its);
meshes_difference.emplace_back(std::move(its));
}
}});
CSGPart part{std::make_unique<indexed_triangle_set>(std::move(its)),
CSGType::Union,
(trafo * vol->get_matrix()).cast<float>()};
*out = std::move(part);
++out;
}});
// Add the operation for each of the partial mesh (outward-facing normals go first).
for (auto* meshes : { &meshes_union, &meshes_difference}) {
for (indexed_triangle_set& its : *meshes) {
CSGPart part{ std::make_unique<indexed_triangle_set>(std::move(its)),
meshes == &meshes_union ? CSGType::Union : CSGType::Difference,
(trafo * vol->get_matrix()).cast<float>() };
*out = std::move(part);
++out;
}
}
CSGPart part_end{{}};
part_end.stack_operation = CSGStackOp::Pop;