My suggestion would be to have the world itself simply fill the entire image with black, thus filling all holes completely. Then each object can go cut holes in it.
RM6442 wrote ...
2012/5/18
Light in a Dark Room
Tried that, it didn't work out too well when there was more than one moving object.
Seems to work pretty well! There is a bit of strange offset when objects are moving though, like an edge of black. Any idea why that might be happening?
Before each object starts moving it refills the hole. Then it moves and carves out a hole at a new location. When the radii overlap, one is obviously being drawn before the other, and is thus being drawn over. At least that's what I think is happening.
My guess is that because you are moving, you are not filling in the quite correct hole (since you have moved since you've drawn it) and so the blackness you draw doesn't quite fit into the hole you drew before.
No, I've mentioned that the hole is refilled before the object moves.
Essentially
refill->move->carve->refill->move->carve->refill->etc.
So it's not that.
Ah I see! Yeah that makes sense now. I think your original diagnosis was correct now that I can visualize it. I definitely think having the world re-fill the image with black would be the way to go in terms of fixing this particular issue. Plus it would speed things up a bit in that each object wouldn't need to draw black circles anymore, they would just need to cut out the hole
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