I'm trying to generate a dynamic texture and use it to draw my scene. I'm using the generated texture to draw a heap of polys. Generating the texture doesn't seem to slow things down too much, so all is well there.
What I don't understand is actually USING the texture slows things down. If I generate the texture but draw everything with a different texture it's ok, if I draw exactly the same stuff with the generated texture it's a lot slower.
Is there any reason for this? Is there a better way to do this stuff in general? It's nothing too fancy, I'm just drawing a basic scene to a texture, then drawing another basic scene with the mapped with the texture.