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



Hi Dave:

Thanks a lot for your reply. Actively I am newbie in computing graphic
area, not familar with the generation of geodesic line. The model I am
working with is 3D membrane structure. This structure has been meshed
with triangular elements before I carry on the search of geodesic line.
The surface is defined as discrete points not analytically defined
surface. That's why I come up this method to search geodesic line on
this kind of special surface. My question is how to locate the
triangular element on the surface in which each segment node will be
projected based on segment node x, y coordinates and how to work out
the z coordinate of projected segment node on this triangular element
based on its node coordinates. Certainly if you can give me another
ideas to generate geodesic line in meshed surface, It would be
appreciated.


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