Ok. I tryed method with a projection on a viewplane. It calculate cut edges right and fast. But i stuck with a cut edge intersection coordintaes. Here is a code: http://c2n.me/3KAWXF5 In short words: Project edge to viewplane (2D space). Construct CLine representation of projected edge. Construct CLine representation of drag line (or cut line) and project it also on a viewplane. Get intersection between this 2D Cline representations. Get Parameter value of this 2D intersection coord. Get via this Parameter value of 2D intersection a 3D intersection (build Cline representation of edge in world space coords and get coord from 2D Parameter value). But unfortunatelly this method gave a cut line distortions. I guess Parameter value that calculated in 2D space shouldn't be used for 3D space. How should i get edges intersection coordinates ?
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