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Fix adapt crash for mixed-element 2D meshes with frozen quad layers #524

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Merged
joshia5 merged 2 commits into from
Dec 16, 2025
Merged

Fix adapt crash for mixed-element 2D meshes with frozen quad layers #524

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996cf39
pumi adapt would crash for mixed element meshes with frozen quad laye…
como2099 Dec 15, 2025
08d787b
Make quad validity check coordinate system-independent and numericall…
como2099 Dec 16, 2025
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16 changes: 16 additions & 0 deletions ma/maQuality.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -569,6 +569,22 @@ bool isLayerElementOk(Mesh* m, Entity* e)
return isPyramidOk(m, e);
if (type == apf::Mesh::PRISM)
return isPrismOk(m, e);
if (type == apf::Mesh::QUAD) {
// For 2D boundary layer meshes, check if quad is non-degenerate
// A quad is OK if it has positive area (non-inverted)
Entity* v[4];
m->getDownward(e, 0, v);
Vector p[4];
for (int i = 0; i < 4; ++i)
m->getPoint(v[i], 0, p[i]);

// Check both triangulation diagonals for positive area
Vector d1 = apf::cross(p[1] - p[0], p[2] - p[0]);
Vector d2 = apf::cross(p[2] - p[0], p[3] - p[0]);

// If both triangles have positive area in same direction, quad is OK
return (d1[2] > 0 && d2[2] > 0) || (d1[2] < 0 && d2[2] < 0);
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@joshia5 joshia5 Dec 16, 2025

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check for +ve magnitude and direction

}
abort();
return false;
}
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