![]() BREPs don’t care about these limitations. ![]() Mesh booleans usually require modifying the resulting mesh by hand to prepare the surface for later operations like bevels. For instance mesh booleans are non-associative, and have often fail when calculating co-planer faces or when multiple vertices sit in the same location. BREPs are nondestructive representations of volumes defined by operations like projections, extrusions, sweeps, booleans, holes, and bevels which can be used to create or modify a solid volume, without a lot of the limitations you see on polygonal operations. In other words there is not much more to these geometry types than what Blender is already capable of. ![]() Nurbs are just surfaces which can be trimmed, extruded, shaped in a freeform manner, etc. ![]() Trimmed nurbs surfaces are used as an intermediate step to create a mesh for BREPs, but whenever you describe nurbs, you seem to be referring to solid modelling or BREP.
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