CAD-CAM Models use NURBS curves and surfaces. Now that we have an OpenGL Gadget, it would be wonderful to supplement it with an ability to define shapes. There is a NURBS lib that is free for commercial use:
OpenNURBS (intro and download)
OpenNURBS
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IdeasVacuum
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OpenNURBS
IdeasVacuum
If it sounds simple, you have not grasped the complexity.
If it sounds simple, you have not grasped the complexity.