Hi Martin,
On 29/11/08 8:46 AM, Martin Großer wrote:
I used an object of osg::TexEnv and the mode "Blend". But I don't know how
the texture color and the object color are combined?
Mode: add -> object color + texture color
decal -> object color - texture color
That would be "subtract"; "decal" modulates color according to texture alpha.
modulate -> object color * texture color
blend -> object color ??? texture color
Can everybody explain the mode "Blend"??
The long version (and authoritative) is the Red Book (or "man glTexEnv").
The short version (for a RGBA texture) is:
C = Cfrag * (1-Ctex) + Cconst * Ctex
A = Afrag * Atex
Basically, for the color channels, the texture color defines the blend factor between the
fragment color (e.g. as determined by lighting or vertex color) and "Cconst", the texture
environment color. The texture alpha channel modulates the fragment alpha.
Cheers,
/ulrich
PS: Please don't hijack threads.
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