find_containing_tetrahedron :: Cube -> Point -> Tetrahedron
find_containing_tetrahedron cube p =
candidates `V.unsafeIndex` (fromJust lucky_idx)
find_containing_tetrahedron :: Cube -> Point -> Tetrahedron
find_containing_tetrahedron cube p =
candidates `V.unsafeIndex` (fromJust lucky_idx)