Hi Agraham

Yes you right, I am a Land Surveyor & Civil Engineer and programming is more of a hobby for me, although I have 2 commercial programs on the market.

Coming back to the delauney theorem, we call it a Tin Model. Once you have done a tachy survey in the field, digitized an existing drawing, scanned a mine dump, etc. one sits with a file consisting of Y, X and Z coordinates. Now before one can do anything with these points, we need to create a Tin Model (Triangles) of these points. No side of a Triangle is allowed to cross the side of another triangle. And the ideal triangle is where the 3 internal angles are all 60 degrees. Once you have a Tin, one can generate 3D views, solid models, calculate volumes, generate cross sections, longitudinal sections, etc. the list is endless.

You ask how many points? Well this can range from a couple of hundreds to a couple of hundred thousands. And yes the model must be 3D.

If you want I can send you the routine that I have for VB6.

Regards

Michael