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Clearing the alpha channel

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Hi! How do I clear the alpha channel, without having to cleart the RGB channels? I want to make a particel spray that is 50% transparent. However, I have a map, that I want 30% transparent. So I guess the only way to do that is to first sat the background alpha to 0.7f, then draw the map, then set background alpha to 0.5f, and draw the particles? Thanks. KLM

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im not to sure about this. untested
glColorMask(0,0,0,1)
glClear( GL_COLOR_BUFFER_BIT);
glCOlorMask(1,1,1,1)

i just looked in the red book, it should work


http://members.xoom.com/myBollux

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