Add missing constraint to flips in HalfEdgeDataStructure and TriangulatedSurface #1498
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It seems there is a configuration error for macOS CI (missing libQGLViewer). |
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it should be ok for macOS. Please retrigger the CI |
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PR Description
This PR adds a new constraint when flipping in HalfEdgeDataStructure and TriangulatedSurface, which is checked by method isFlippable. The new constraint is that, when you flip an arc bordered by two triangles, the two vertices of the triangles that are not extremities of the arc must not be already neighbors.
Checklist
cmakemode (otherwise, Travis C.I. will fail).