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.
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.