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Hello,

assume having tho surfaces (S1 and S2) represented by 3d points and having a 
2d
delaunay triangulation of one of these surfaces (lets say of S1), I would like
to check if a point of S2 falls within the region/boundary/extend of surface
S1. It must only fall within the boundary not       necessarily in the plane.

Is there a way to create a boundary polygon of a triangulation or to check if 
a
point is within the extend of a triangulated surface? Could this be done with
constrained triangulation? If yes, how could i tell which are the points that
form the boundary. Hope you understand my question.