English: The intersection between two multi-surfaces. The first multi-surface is the layered blue sheets, and the second multi-surface is the layered red sheets. Vector F is the surface density in the blue sheets. Vector G is the surface density in the red sheets. The green parallelogram is a 2D cross-section of the prism that forms the intersection. The intersection paths become more dilute the further angle theta deviates from 90 degrees, so the intersection path density is the cross product of F and G. The intersection paths are also oriented out of the screen in this example.
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