So, when (cat1 & col2) or (cat2 & col1) != BitMask32(0) they will collide, so:
Just for my understanding =P
BitMask32(0b001) & BitMask32(0b100) do not collide
BitMask32(0b001) & BitMask32(0b101) do collide
BitMask32(0b001) & BitMask32(0b111) do collide
BitMask32(0b101) & BitMask32(0b010) do not collide
and so on…
Thanks
blenderkid