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rendering multiple lightmaps

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Say I have a polygon, and its base texture. I have multiple lightmaps representing lights from different sources. Ii don't want to bake them into one lightmap; it would make shadow volume rendering close to impossible. Is there a way to render the multiple lightmaps onto each other real-time without the use of ARB extensions?

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Well all I can think of is doing it in mulitple passes provided that you already have the lightmaps. If you are speaking of creating the lightmaps on realtime as well then I am not sure how feasible it is. Maybe with a small 3D texture and some hacks, you could do quick and dirty dynamic lightmapping.

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The lightmaps aren't dynamic, they're all static but dependent on the light source. I figured I'd need multiple passes, but what blend function(s) would be suitable for this?

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