Issue with geometry rendering - SceneKit

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I have a set of SceneKit custom geometries. When rendered, and under certain viewing angles, they seem as if they are transparent (one can see through their outer surface and see what is behind, or one can see the inner surfaces). Their material transparency and the opacity of the encapsulating nodes are all correctly set. Also, some of them intersect and their intersection is fully visible. Any thought as to what might be the problem? Thanks.

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