**comp.graphics.algorithms**

## Subject: **Re: How to project a point onto a surface?**

Thanks Dave for your reply. I really appreciate your help. The mesh

surface in my case is composed of finite element elements which are

triangles with three nodes coordinates known. I want to make an

algorithm to let user interactively choose two end points on two

surface boundary edges. Then the algorithm can find out the geodesic

line between these two end points over the mesh surface. The method in

my question is similar to first point you mentioned:determine which

triangle a point projects

using 2-dimensional methods. However, I would like to try another

method as well. I am very interested in your "linear walk" algorithm.

Can you tell me where I can find detail information about this

algorithm? The union of the triangles in my case is a convex polygon.

Thanks.

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