Java SE (Java Platform, Standard Edition)

Hi,

I got some polygons in a GeometryInfo object. A triangulation is applied automatically. This operation yields several trianlges for each strip.

Now my problem: Some of my strips are concave, some are convex (with respect to a plane) after the triangulation. When I try to change the order of the input vertices, I can influence the outcome.

I want to have only concave strips as a result. How can I detect in advance, which vertices of a strip will form a triangle (and thus find the right order of vertices)?

Thanks for comments!