are you already implementing bumpmapping ? i ask because in my project i need to set some surfaces with a particular effect, i dont want a global bumpmapping because i'll become a lot hard to render. i'd like for example set a rock wall with a bump detail map, some metal parts with some reflections/translucency, etc. but i dont know it'll be however difficult to calculate lights differently from a "plain" texture of a wall and the "bump" one next to this.
have you any idea/already coding something? i'd like to not use shaders for now, because are not very compatible with many cards. bump for GeForce 2 and up,Radeon 7000 and up. pixel effects with GeForce 3/4 and up, ATI 8500 and up, the most compatible choice. it's better more support than better effects but that works only on too early hardware.
just my 2 cents
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