Sukender,

Look for premultiplied alpha. This allows for mixing additive and alpha 
blending in a single texture.

See 
http://home.comcast.net/~tom_forsyth/blog.wiki.html#[[Premultiplied%20alpha]]

--
Roland

------------------
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http://forum.openscenegraph.org/viewtopic.php?p=7171#7171





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