what about performace of 3d texture? when i try to render a sigle triangle coverted by a 3d texture (filter is set GL_NEAREST) i get about 40 fps. when i use GL_LINEAR perfomace is even much worse.
i have geforce2mx400. i’m running in 640x480 window on 1027x768 16-bit desktop.
is there a way how to improve this horrible performace (some specific texture format - RGB, RGBA, color depth?? or someting else?? or my card does not support it??), please…
A GeForce2 doesn’t support 3D textures in hardware. Therefore, performance is bad because you’re rendering in software.
Why does no one believe what i say?
'coz everybody says something else (ok, it’s 2:1 now so it’s probably not supported) 
Originally posted by miko:
'coz everybody says something else (ok, it’s 2:1 now so it’s probably not supported)
The only NVIDIA cards that support 3D texturing are NV20 and up. This means GF3, GF4 Ti and GF FX. On all other cards, 3D texturing will be implemented in software (they’re required to do so because it’s part of the OpenGL core).
All ATI cards since the Radeon also accelerate 3D texturing, although I believe there were some peculiar restrictions on the original Radeon.
– Tom
There is a very easy way to find out which extensions are supported. Go to nehe.gamedev.net and download lesson 24. This program lists all extensions, which are supported by your hardware. And GL_EXT_ TEXTURE_3D won´t be listed.
Jan.
Originally posted by Jan2000:
[b]There is a very easy way to find out which extensions are supported. Go to nehe.gamedev.net and download lesson 24. This program lists all extensions, which are supported by your hardware. And GL_EXT_ TEXTURE_3D won´t be listed.
Jan.[/b]
The extention is listed. It just implemented on software for a Geforce 2MX like vertex shader in DirectX : a DX7 card can use it, but it is in software.
The best way to tell support for an extension on nvidia hardware is to look at the chart at the beginning of their OpenGL extensions specification here:
http://developer.nvidia.com/view.asp?IO=nvidia_opengl_specs
3D textures are supported in hardware on Geforce3 and up only.
– Zeno
thnx you people…
Originally posted by Tom Nuydens:
All ATI cards since the Radeon also accelerate 3D texturing, although I believe there were some peculiar restrictions on the original Radeon.
It uses two texture units. So with the three TMUs you can either use one 3D and one 2D, or three 2D.