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z-buffer error
Posted: Wed Feb 21, 2007 3:36 pm
by lordcool
i draw a grass ploygon on a plane ground. but z-buffer error.
see this,
http://hompy.ollio.com/view.asp?fnm=hompy164071.jpg
tested gforce7900GT(with latest driver) winXP
irrlicht1.2 D3D9 and OPENGL
i need help.
Posted: Fri Feb 23, 2007 7:38 am
by datamagik
Your jpg was not visible when i looked at your page.
Perhaps you might just upload the jpg instead of using the asp to show it?
Posted: Fri Feb 23, 2007 7:10 pm
by Phant0m51
Your problem is that you're drawing the grass polygon at the exact height that you're drawing the ground.
Try moving the grass polygon up.
Posted: Sat Feb 24, 2007 2:20 pm
by lordcool
grass polygon height is high enough.
I found out this problem.
my program uses the high position values. it's higher than 2^24.
i guess the problem is 24bits z-buffer overflow.
i tested some ATI card and most NVidia card have this problem.
but some ATI Radeon card was fine.
this problem is existing the position value higher than 2^18.
and skybox shaked when camera moving.
because of 32bits depth buffer dosen't working both gl and d3dx.
i resolved this,
- position data recalculate lower values real time from DB when recieving often.
reply any suggestion if you have any good idea or info.
