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> CAD programs aren't just a different set of operations on the same data, they use an entirely different representation (b-rep [1] vs Blender's points, vertice
by diggan 1y ago
> CAD programs aren't just a different set of operations on the same data, they use an entirely different representation (b-rep [1] vs Blender's points, vertices, and polygons).
So with that in mind, there should be something that is possible to build in CAD, but impossible then to build in Blender?
I know the differences between the two, I understand they're fundamentally different, yet I seem to be able to produce similar results to others using CAD, so I'm curious what results I wouldn't be able to reproduce in Blender.
Any concrete examples I could try out?
- AnIrishDuck 1y agoSure. Create a diamond polygon and revolve it around a point. Blender has methods and tools to _approximate_ doing this. It has a revolve tool... where the key parameter is the number of steps. This is not a revolution, it's an approximation of a revolution with a bunch of planar parts. BREP as I understand it allows you to describe the surfaces of this operation precisely and operate further on them (e.g. add a fillet to the top edge). Ditto for things like circular holes in objects. With blender, you're fundamentally operating on a bunch of triangles. Fundamental and important solid operations must be approximated within that model. BREP has a much richer set of primatives. This dramatically increases complexity but allows it to precisely model a much larger universe of solids. (You can kinda rebuild functionality that geometric kernels have with geometry nodes now in blender. This is a lot of work and is not a great user interface compared to CAD programs)