Flips the surface such that the front and back of the surface are switched. All measures are changed as needed, including the vertex normal measures. Note: The vertex normals are not flipped (scaled by -1). Refer to reverse() if the vertex normals need to be flipped. Note: FMETriangleStrip have a method called isFlipped() that is to be used in conjunction with the geometry to determine which side is the front. When isFlipped() returns True, the front is actually the opposite side of what the coordinates of the first triangle in the strip indicate.

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