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 Overlapping polygons  (Read 1575 times) 0 Members and 1 Guest are viewing this topic.
mudman

Junior Devvie

Here we go again...

 « Posted 2006-03-22 21:33:37 »

I was wondering, can OpenGL handle this problem:

Triangle Red overlaps Green, Green overlaps Blue but blue also overlaps red..
Surely something better than sorting polys and drawing them sequentially must be done, since no general absolute ordering works for polys in 3D space?
Orangy Tang

JGO Kernel

Medals: 57
Projects: 11

Monkey for a head

 « Reply #1 - Posted 2006-03-22 21:40:33 »

no general absolute ordering works for polys in 3D space?
If you absolutely needed to draw things in the right order, you'd have to split at least one of the polys based on the planes of the others, then sort the remaining fragments. Fortunately though you can just use a Z-buffer

[ TriangularPixels.com - Play Growth Spurt, Rescue Squad and Snowman Village ] [ Rebirth - game resource library ]
mudman

Junior Devvie

Here we go again...

 « Reply #2 - Posted 2006-03-22 21:42:42 »

Well if Red has Z=3, Green has Z=2 what Z must Blue have then? No number greater than 3 and smaller than 2 exists ;p

Edit: Ok, I guess I was a little too fast then, so the Z-value is actually painted for each pixel?
Thanks, this is something that has been puzzling me ever since I first read about the painters algorithm.
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