[amelius]

Can't you mathematically work out how to change the colors/opacity to rearrange the job?

[Rapzid]

Having that knowledge sounds just as expensive if the operations aren't commutative.

[amelius]

Yeah, somehow between comments I forgot this was about shadows and I was thinking more about drawing polygons. In that case, you can break up the polygons and work out the colors for each of the (theoretically 2^N) regions of overlap.

[klysm]

I think there’s still a dependency graph