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The untransformation is done using the newly added UntransformTo() functions which call Matrix4x4::ProjectRectBounds(), which returns an empty rectangle if the result is not at least partially on the positive side of the w = 0 plane. UntransformTo() returnis the transformed rectangle if it's not empty, and Nothing() otherwise, making callers check for this case. The patch also adds some assertions to places where we apply transforms we know should be 2D (and thus didn't switch to use UntransformTo()), checking that the transforms are in fact 2D. --HG-- extra : rebase_source : bbc226f4135c2cf229c4e00dfb017a6c9c078391 extra : source : c2732f62a3b9a5246801aa000ce572ee07f53481 |
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