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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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Guest Anonymous Poster
you can use the alpha value of your current rendering color

glColor4f( r, g, b, alphavalue );
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
draw it

in your case:

glColor4f( r, g, b, .5f );
draw particles
glColor4f( r, g, b, .3f );
draw map

we wanna play, not watch the pictures

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Guest Anonymous Poster
Sorry about that multi-posting,
my ISP is so slow, so to load a page takes like 5 minutes,
and I was in a hurry...


ANyway, thats for your help!

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