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OpenGL How to execute the intersection between two object

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Dear everybody, I'm doing the NC machining simulator (VC++, OpenGL), and I successfully offseted a solid object by a specified distance equal to the radius of cutter. The problem I got that how to execute the intersection between cutter and stock. I downloaded OpengCSG in http://opencsg.org but I don't know how to use it. I heard a Z map method for intersection. The cutting stock is represented as a Z-vector map (vectors point upward). Cutting of the stock takes place by intersecting the cutter swept surface with the stock. But I don't know how to convert the stock to Z map and what kind of stock I have to render correctly for this Is there anyone here has experienced thi NC machining simulator? Please help me, this is my thesis :((

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