   Add points to improve triangulation
  I want to triangulate (tetrahedralize really) a closed concave shape, while ensuring that all angles of every tetrahedron are no smaller than, say, 5 degrees. Depending on the input shape, this might not be possible, so my idea is to strategically input extra points until it is possible, then triangulate.Does anyone know a good way to do this, adding as few extra points as possible?   
  Perhaps you should check our this paper.  In general, creating a conforming tetrahedralization with such guarantees is a difficult problem; but I saw the presentation for this method at Siggraph 2007 and it seemed pretty interesting, and not too difficult.;  Hey thanks gfxnomad. It will take me a while to read and understand this paper, but it seems like exactly what I'm looking for.   