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That's how I've always done it. I honestly can't think of a way the animation system can be used to do the same thing. It technically isn't an animation at all. It's two textures sharing a base point and you use texcoord/resizing on the overlaying texture. If you use a greyscale image, you can use texture:SetVertexColor() on the overlay texture to set its color.
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WoWInterface AddOns
"All I want is a pretty girl, a decent meal, and the right to shoot lightning at fools."
-Anders (Dragon Age: Origins - Awakening)
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