Gene Tech zfighting after index buffer merge

Post by **dpJudas** » Wed May 23, 2018 4:47 pm

Seems that some of the geometry is getting rendered twice, as illustrated by the screenshot above. Warp 5446 -415 -32. The pillar in the middle is doing this - some other parts on the map as well. Also, if you bring up the map it seems to be rendering some small part of the scene at the bottom of the screen for some reason.

Post by **Graf Zahl** » Wed May 23, 2018 11:06 pm

Is this still present after the fix I pushed yesterday? I have seen it before that was done but not afterward.

Post by **dpJudas** » Thu May 24, 2018 2:33 am

I think so. Did a pull before building - but I'll try again tonight when I get home from work to be absolutely sure.

Post by **_mental_** » Thu May 24, 2018 3:11 am

Unfortunately it's still there. This is noticeable on vertical surfaces around some doors

Code: Select all

-iwad doom2 -file njgtb4ts.pk3 +map map01 -nomonsters "+warp 6750 -1980"  // and turn back
-iwad doom2 -file njgtb4ts.pk3 +map map01 -nomonsters "+warp 6750 -1480"

Post by **Graf Zahl** » Thu May 24, 2018 12:33 pm

This wasn't z-fighting. It was some imprecision in the shader where the backside check for dynamic lights failed because the dot product of two supposedly orthogonal vectors apparently wasn't always 0.

ZDoom