Hm, just a stupid thought. If two cubes intersect (and not the first contains
the second) then at least one edge of the first cube should intersect a face
from the second. So why not trace the second cube from the vertices of the first
along the edges with POV? May be one must trace from the hit point again in the
same direction to determine if one is inside the second cube already (that way
POV determines points inside a mesh, odd count inside, even count outside).

Best regards,
Michael

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