Stephen wrote:

> Thanks Mike,
> 	I could have Googled it but I was doing an "Invisible" :P
> What applications are they used in?

The one I've been messing with was output by the game Spore, when I 
exported my creature to a mesh.

I think Blender and other modeling programs use them as well. I'm 
betting inside a lot of games that use D3D hardware probably use them, 
since they can give better surface normal results. Many of the 
commercial 3D packages can use them, too.

-- 
~Mike

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