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Blaster

Subtractive blending over the frame buffer

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I know how to do additive blending over the frame buffer. You simply enable alpha blending and set both source and destination blend to D3DBLEND_ONE. But how do I do subtractive blending? I am using Direct3D 7. There seems to be a BLENDOP in Direct3D 8 but I can't use that. Note that I am not trying to blend multiple textures, I only have 1 texture. So I am not blending between texture stages. I want to blend a textured poly with subtractive blending on what's already displayed on the screen. Please help, I don't want to resort to software to do it. I do have the code written for software (for my DirectDraw implementation), but I also want all my blending effects (alpha, add, sub) in my Direct3D implementation. -------- Blaster www.blastersoft.com www.strategyfirst.com Edited by - Blaster on November 22, 2001 6:07:14 PM

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Come on, anyone??

I want to make nice smoke effects, etc.

--------
Blaster
www.blastersoft.com
www.strategyfirst.com

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