masking ?

To make a mask, you need to make two versions of your graphic. One is the normal version with a black background where there aren''t any colors. The other should be a black and white version of the image. Wherever there is black, you should fill in white. Where there is color, you should make it all black. This way your second image will only consist of the colors black (0,0,0) and white (255,255,255). Once you have your two files you can load them both as textures. When drawing the quad, first draw it with the masked black and white texture. To do this, use the function glBlendFunc(GL_DST_COLOR,GL_ZERO), then change to the masked black and white texture and then draw the quad. After this, change the blending by calling glBlendFunc(GL_ONE,GL_ONE), change the texture to the normal version of the image, and then draw the quad a second time. This way when you apply the actual image, you have changed the background by drawing the black and white version first. Once both textures are draw using the different blending methods the texture should look okay. With the background only showing up over the black parts.

thanks ! I studied also the 20th nehe tut and i did it !

glHorizon_Project



www.web-discovery.net

Are you ACTUALLY doing the 2 image way? Do what I said on your other post, it''s easier and with identical results.

Alex Broadwin
A-Tronic Software & Design
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"if you fail in life, you were destined to fail. If you suceed in life, call me."
"The answer is out there."
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ok Atronic, i''ll try that too ! Thanks

glHorizon_Project



www.web-discovery.net