Re: Quake Iv?
Actually Doom3 can't support DX9 since it's OpenGL. That doesn't mean it can't run cg or hlsl programs using PS1.1/1.4/2.0 etc. I believe the heathaze is a PS2 shader.
Some of the mods in development will feature all new shaders for water and stargate effects. It seem very easy to create your own matrials and add pixel shaders to them.
Unified lighting is the future I think. Anything with out it now looks dated. The 'new' HL2 screenshots would have looked good a year and half ago, but now they look like q2 with higher res textures and few shaders for water and that magnifing glass.
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