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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由許多個面形成的角在偏移/薄殼後可能產生缺口或自交的情形。

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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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薄殼時移除的曲面需要延伸填補缺口時會發生錯誤。 薄殼時移除洞的底面。

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任何單一曲面偏移後有自交的情形會發生錯誤。