Please Explain

Please explain why this is considered a closed polysuface. It has a shell-shaped hole in it!

Closed.3dm (196.0 KB)

Hello - the render mesh is certainly confused - there may be a loop in the trim curve of the central shell shaped face - in any case, MergeAllFaces to clean up.

-Pascal

Thanks Pascal. However, when I merge all faces I lose the shell-shaped hole in the middle which I need to keep. Any other ideas?

Thanks,

Dennis

Hi Dennis, if you want the hole, ExtractSrf that central face.

-Pascal