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Purpose of Geom_RectangularTrimmedSurface?

Nathaniel Essenberg's picture


I have a question out of curiosity about the Geom_RectangularTrimmedSurface​ type, also used in STEP files. I am wondering what is the purpose of this type? Are there any good use cases for it? Why not simply use the base surface with the wires/uv bounds and be done with it?

I have seen some exporters simply make Geom_RectangularTrimmedSurfaces for most of the geometry, which seems to me like a bit lazy or simplified approach. Why not export as a NURBS face right away instead of making a Geom_RectangularTrimmedSurface with a basis NURBS surface?

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