bumps in fixed function shader

Graphics Shaders & Materials
1

Hi all !

I’m wondering wether it’s possible or not to have bumpmaps in fixed function shader ?
The doc didn’t help me very much ( thouth the ‘material’ keyword might be one possibility ) and the
awesomely crappy search engine in this forum got me thousands of useless posts…

Mebe someone already wrote such a simple and fast shader ?
I’d be please to get more info about this :wink:

thanks for your answers and help !

regards.

2

Bump mapping requires pixel shading, which is not possible in the fixed function pipeline. If you want bump-mapping, you will have to use a Cg shader.

3

That’s not true; you can do object space normal mapping using the undocumented Dot3 texture combiner.

http://forum.unity3d.com/threads/14797-colored-speculars-and-bump-map

That said, there’s no reason to use a fixed function shader anymore. I write in GLSL first, so I can get a performance prediction from PVRShaderEditor, and then copy it to Cg if I need to support a blah platform.

4

Hi !

Thanks for this accurate answer Jessy !
Yes i remember in the prehistoric times when the 3Dfx ruled the world, a guy from this company
found a way to do realtime bump mapping. In this times those boards ( the Voodoo2 ) had nothing but fixed function
shaders.

the small fixed func shader:

works in an interresting way. Now that i know the key is on the combine fixed function i gonna dig this way.

thanks a lot and have a nice day !