I've been having a bit of fun with a topological modeller called Topmod, which creates pretty complex 3D meshes using some pretty fancy techniques. And it's free. Only on the web.
Download Topmod here.
Get a copy of Blender for free here - Topmod is only a modeller and won't animate or render your creations.
The coordinates must be in decimal degrees so you’ll need to unproject any projected coordinates and then re-project the result. This may introduce some distortion. I didn’t notice any in my application but I’d suggest some more rigorous testing if you’ve got tight precision requirements. math
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