Clearing the alpha channel
Author
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
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
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
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!
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!
This topic is closed to new replies.
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