Shell

Shell and OffsetSrf for polysurfaces are works in progress. There are several known problem areas:

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Singular surfaces can cause problems, especially when the offset of the surface must be extended at the singularity. The extensions are done in OffsetSrf (Corner=Sharp) and shelling, which always uses sharp corners. These extensions happen when the offsets of adjacent surfaces come apart. Also, cone-like singularities cause problems in all cases.

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Complex vertices (ones with more than three edges) can be problematic, especially in shelling and sharp corner offsets and where some, but not all, of the surfaces at the vertex offset apart.

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OffsetSrf on polysurfaces with naked edges, where the naked edges make concave boundaries will not work correctly.

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If faces adjacent to the removed faces offset in such a way that the removed face must be extended to fill in the gap, it will fail. Remove surface (x).

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Any surface whose offset self-intersects will cause a problem.