We have difference.
We have inverse objects.

Can I plot, say a wall, and then subtract away doorways with negative objects?
It would vastly simplify things to be able to define a room - an addition with
said negative doorway, and automagically open a doorway to that room when it's
added into the scene - rather than having to go search through the code ... or
an include file ... to find out where to insert the right box in a difference
statement.

Just a thought.

It would be cool to make things go through walls in animations with a large
negative-space sphere surrounding a smaller "positive" sphere.
Or a black hole traveling through space.
Or the invisible man walking through a cloud of smoke...

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