suzanne.soy/FreeCAD
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

add plausibility for self-intersectin check to filter out false-positives

Browse Source
This commit is contained in:
wmayer 2016-08-08 16:40:11 +02:00
parent aa2da87f2c
commit 8d3e5a31fb
1 changed files with 12 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/Mod/Mesh/App/Core/Elements.cpp
View File

@ -808,6 +808,18 @@ int MeshGeomFacet::IntersectWithFacet (const MeshGeomFacet& rclFacet,
rclPt0.x = isectpt1[0]; rclPt0.y = isectpt1[1]; rclPt0.z = isectpt1[2];
rclPt1.x = isectpt2[0]; rclPt1.y = isectpt2[1]; rclPt1.z = isectpt2[2];
// With extremely acute-angled triangles it may happen that the algorithm
// claims an intersection but the intersection points are far outside the
// model. So, a plausability check is to verify that the intersection points
// are inside the bounding boxes of both triangles.
Base::BoundBox3f box1 = this->GetBoundBox();
if (!box1.IsInBox(rclPt0) || !box1.IsInBox(rclPt1))
return 0;
Base::BoundBox3f box2 = rclFacet.GetBoundBox();
if (!box2.IsInBox(rclPt0) || !box2.IsInBox(rclPt1))
return 0;
// Note: The algorithm delivers sometimes false-positives, i.e. it claims
// that the two triangles intersect but they don't. It seems that this bad
// behaviour occurs if the triangles are nearly co-planar