I'm using Delaunay to triangulate a concave polygon, but it fills in the concavities. How do I automatically remove the triangles that are outside the polygon boundaries?
A:
You shouldn't, you should find a Delauney routine that handles boundaries correctly.
Alternately you could, assuming you know the edges, go through every triangle and delete those that cross an edge. Search for segment-segment interestion tests for code to do this.
Martin Beckett
2010-01-06 18:13:15
A:
Self-answer: in some cases, this is impossible. I needed to use a constrained Delaunay algorithm: http://www.cs.cmu.edu/~quake/triangle.delaunay.html
Archagon
2010-02-19 09:46:16