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Fix issue that in certain cases the paint is not applied when faces are parallel to an axis, by adding a small tolerance to the bbox

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This commit is contained in:
Noisyfox
2026-05-10 11:45:15 +08:00
parent f8a18e7656
commit 219ef664bd
1 changed files with 9 additions and 7 deletions
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16
src/libslic3r/TriangleSelector.cpp
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@@ -2335,18 +2335,18 @@ public:
// If both ends at the same side and farther than tolerance, skip
const float dist_a = pts_dist[idx_a];
const float dist_b = pts_dist[idx_b];
if ((dist_a > tolerance_ && dist_b > tolerance_) || (dist_a < -tolerance_ && dist_b < -tolerance_)) {
if ((dist_a > tolerance && dist_b > tolerance) || (dist_a < -tolerance && dist_b < -tolerance)) {
continue;
}
// Find the projected line segment which has distance to the plane within the tolerance
Vec3f pt_a = pts_proj[idx_a];
Vec3f pt_b = pts_proj[idx_b];
if (std::abs(dist_a) > tolerance_) {
pt_a = (tolerance_ - dist_b) / (dist_a - dist_b) * (pts_proj[idx_a] - pts_proj[idx_b]) + pts_proj[idx_b];
if (std::abs(dist_a) > tolerance) {
pt_a = (tolerance - dist_b) / (dist_a - dist_b) * (pts_proj[idx_a] - pts_proj[idx_b]) + pts_proj[idx_b];
}
if (std::abs(dist_b) > tolerance_) {
pt_b = (tolerance_ - dist_a) / (dist_b - dist_a) * (pts_proj[idx_b] - pts_proj[idx_a]) + pts_proj[idx_a];
if (std::abs(dist_b) > tolerance) {
pt_b = (tolerance - dist_a) / (dist_b - dist_a) * (pts_proj[idx_b] - pts_proj[idx_a]) + pts_proj[idx_a];
}
// If any projected end is inside the triangle, then is in
@@ -2387,10 +2387,10 @@ public:
return std::clamp(a, 0.f, 1.f) >= facet_angle_limit;
}
static constexpr float tolerance = 0.01f;
private:
const Barycentric barycentric_;
const float tolerance_ = EPSILON;
const float tolerance_sqr_ = tolerance_ * tolerance_;
static const double facet_angle_limit;
static float point_to_line_dist(const Vec3f& p, const Vec3f& a, const Vec3f& b)
@@ -2494,6 +2494,8 @@ TriangleSelector::TriangleSplittingData TriangleSelector::remap_painting(
pt_bbox.extend(pv0);
pt_bbox.extend(pv1);
pt_bbox.extend(pv2);
pt_bbox.min() -= Eigen::Vector3f::Constant(TriangleCursor::tolerance);
pt_bbox.max() += Eigen::Vector3f::Constant(TriangleCursor::tolerance);
AABBTreeIndirect::traverse(target_tree, AABBTreeIndirect::intersecting(pt_bbox), [&](const AABBTreeIndirect::Tree3f::Node& node) -> bool {
size_t face_idx = node.idx;