multitexturing using alpha-blended layers

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JoeGr
 #1
From the docs entry for 'TextureBlend':
In the case of multitexturing (more than one texture applied to an entity), it is not recommended you blend textures that have been loaded with the alpha flag, as this can cause unpredictable results on a variety of different graphics cards.

I just wondered how much truth there is in this. I tried it myself and my GeForce2 didn't seem to have any problems. So should it definitely be avoided?