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The documentation lists the face order of cube maps like this: +X, -X, +Y, -Y, +Z, -Z  But using this order in a cube map SCNScene.lightingEnvironment.contents and .background.contents will result in +Z and -Z being wrong, the other faces are correct.   Here is an example command line program that demonstrates this. It will load and

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Is there a way to enable LLVM Polly optimization in Xcode?