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Skip SplitImprove if it would insert tets with negative volume

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This commit is contained in:
Matthias Hochsteger 2025-02-24 17:12:15 +01:00
parent 48084623e2
commit f6273d0659
1 changed files with 25 additions and 2 deletions
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27
libsrc/meshing/improve3.cpp
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@ -14,6 +14,16 @@
namespace netgen
{
bool WrongOrientation(Point<3> p1, Point<3> p2, Point<3> p3, Point<3> p4)
{
Vec<3> v1 = p2 - p1;
Vec<3> v2 = p3 - p1;
Vec<3> v3 = p4 - p1;
Vec<3> n = Cross(v1, v2);
return n * v3 > 0;
}
static constexpr int tetedges[6][2] =
{ { 0, 1 }, { 0, 2 }, { 0, 3 },
{ 1, 2 }, { 1, 3 }, { 2, 3 } };
@ -562,15 +572,28 @@ double MeshOptimize3d :: SplitImproveEdge (Table<ElementIndex,PointIndex> & elem
newel1.Touch();
newel2.Touch();
Point<3> pel1[4];
Point<3> pel2[4];
for (int l = 0; l < 4; l++)
{
if (newel1[l] == pi2) newel1[l] = ptmp;
if (newel2[l] == pi1) newel2[l] = ptmp;
pel1[l] = pel2[l] = mesh[oldel[l]];
if (newel1[l] == pi2) {
newel1[l] = ptmp;
pel1[l] = pnew;
}
if (newel2[l] == pi1) {
newel2[l] = ptmp;
pel2[l] = pnew;
}
}
if (!mesh.LegalTet (oldel)) return 0.0;
if (!mesh.LegalTet (newel1)) return 0.0;
if (!mesh.LegalTet (newel2)) return 0.0;
if( WrongOrientation(pel1[0], pel1[1], pel1[2], pel1[3]) ||
WrongOrientation(pel2[0], pel2[1], pel2[2], pel2[3]) )
return 0.0;
}
if(bad2 >= 1e24) return 0.0;