What is the story with IsClosed3D?

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09-18-2012 08:08 PM
AlanKeown
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I am creating multipatches from existing geometries and finding it hard to work out why IsClosed3D shows some as Closed while other apparently closed geometries are shown as not Closed.

Is there someone who can tell me what I am missing?

I have worked out that the ordering of the vertices in different faces has an impact and also that the RingType can affect the result.

If I order all the vertices on the attached geometries to be clockwise, they are both NOT closed. If I change the order of the vertices one IS closed and the other is NOT closed.

Any insights would be gratly appreciated.

Cheers
AlanK
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