[image] 1CLOSED.3dm (348.6 KB) I have an imported Brep that is clearly 2 parts, but it showing as a valid closed polysurface. How can I detect these types of Breps? Thanks, Dan

RH-85074 is fixed in Rhino 8 Service Release 15

Closed polysurface?

siemen December 6, 2024, 7:37pm 8

Can’t you use this?

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