sualkdimsch

04-02-2001, 09:27 PM

Hello out there

There has been a lot of talking about bump mapping and per pixel lighting in general. But has any body considered yet what to do it in a real life level with ~100's Lightsources. If you want to use bump-mapping there you can't do a pass for every source so you have to combine real time per pixel lighting with your precalculated lightmap. What I'm currently doing is I precalculate lighting thereby choose a few lights per polygon that "mainly" contribute to its intensity and at rendering time I apply the lightmap and then modulate the Lightmapped polygon with the bumpmap light information. In an equation that means:

Frag.Color = Tex*Lightmap * N*L

Where N is the bumpmap normal and L = Sum of all the lightvectors of the choosen lightsources for the current polygon.

I admit that this is basically wrong since it sort of double modulates the polygon with diffuse lighting and will darken it. But I compensate that with an appropriate Ambient light offset.

My question is are there (and I suppose there are) any better ideas ?!

Thanx

There has been a lot of talking about bump mapping and per pixel lighting in general. But has any body considered yet what to do it in a real life level with ~100's Lightsources. If you want to use bump-mapping there you can't do a pass for every source so you have to combine real time per pixel lighting with your precalculated lightmap. What I'm currently doing is I precalculate lighting thereby choose a few lights per polygon that "mainly" contribute to its intensity and at rendering time I apply the lightmap and then modulate the Lightmapped polygon with the bumpmap light information. In an equation that means:

Frag.Color = Tex*Lightmap * N*L

Where N is the bumpmap normal and L = Sum of all the lightvectors of the choosen lightsources for the current polygon.

I admit that this is basically wrong since it sort of double modulates the polygon with diffuse lighting and will darken it. But I compensate that with an appropriate Ambient light offset.

My question is are there (and I suppose there are) any better ideas ?!

Thanx