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Multi Pass Texture Blending

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A short question... I tried to achieve something like the quake3 skins with multiple texture stages blended on top of another. But my card supports only 2 stages. for this reason I need the multi pass version. But it seems not to work. How can I achieve the following? Stage1 Texture (some bitmap with alpha), blendmode: alphablend Stage2 Texture (another bitmap), blendmode: add Stage3 Texture (wave texture), blendmode: premodulate or something like this. Is this possible or can I just use alphablending?

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Instead of settting the third stage (which only some cards support - Geforce 3, Radeon and Radeon 8500, Voodoo3...) you just render the polys with the first 2 stages, then render the object again with the first stage filled with what the third stage was supposed to be. I am not sure about setting the blend modes and whatnot though.

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