Currently we run the OpenSCAD binary in order to perform hull and minkwoski operations and import the result. Among these are convex hull, minkowski sum, glide and subdiv. Some operations which are useful on meshes are not meaningful on a BREP model and can not be fully supported. Therefore conversion from CSG to BREP should, in theory, be possible whereas conversion from BREP to CSG is, in general, not. The FreeCAD geometry kernel (OCCT) works using a boundary representation. FreeCAD allows you to create CSG with primitives as well. OpenSCAD creates constructive solid geometry, as well as imports mesh files and extrudes 2D geometry from DXF files.
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