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Fixed a raycaster problem with handling duplicate hits from igl

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The duplicate hits confused winding number calculations in the raycaster, which in turn returned incorrect hit.
This commit is contained in:
Lukas Matena 2020-01-09 14:06:39 +01:00
parent e9d340c87f
commit f22961edae
2 changed files with 10 additions and 7 deletions
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14
src/libslic3r/SLA/Common.cpp
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@ -297,7 +297,14 @@ EigenMesh3D::query_ray_hits(const Vec3d &s, const Vec3d &dir) const
// The sort is necessary, the hits are not always sorted.
std::sort(hits.begin(), hits.end(),
[](const igl::Hit& a, const igl::Hit& b) { return a.t < b.t; });
// Remove duplicates. They sometimes appear, for example when the ray is cast
// along an axis of a cube due to floating-point approximations in igl (?)
hits.erase(std::unique(hits.begin(), hits.end(),
[](const igl::Hit& a, const igl::Hit& b)
{ return a.t == b.t; }),
hits.end());
// Convert the igl::Hit into hit_result
outs.reserve(hits.size());
for (const igl::Hit& hit : hits) {
@ -342,14 +349,11 @@ EigenMesh3D::hit_result EigenMesh3D::filter_hits(
for (const sla::DrainHole& hole : m_holes) {
std::array<std::pair<float, Vec3d>, 2> isects;
if (hole.get_intersections(sf, dirf, isects)) {
// Ignore hole hits behind the source
if (isects[0].first > 0.f) hole_isects.emplace_back(isects[0].first, isects[0].second, true);
if (isects[1].first > 0.f) hole_isects.emplace_back(isects[1].first, isects[1].second, false);
}
}
// // Remove hole hits behind the source
// for (int i=0; i<int(hole_isects.size()); ++i)
// if (hole_isects[i].t < 0.f)
// hole_isects.erase(hole_isects.begin() + (i--));
// Holes can intersect each other, sort the hits by t
std::sort(hole_isects.begin(), hole_isects.end(),