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DP3 bump mapping with alpha

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Hi, Just for fun I was delving back into Fixed Function Pipeline and taking a look at DP3 bump mapping (never tried it before). I was wondering if it were possible to include alpha into the equation so that you get a partially transparent texture lit using DP3 bump mapping? My first attempts ended up with the light vector turning the texture black and therefore transparent. Any ideas of the renderstates I need to set up to simply light a texture using DP3 AND retain transparency without the transparency being affected by the DP3 operation? Does that make sense?

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You have me interested now - I wouldn't mind seeing a screenshot if you could take one (yes, I know the DP3 won't be as cool looking in a screenshot, but I am interested in seeing what it does look like).

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