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Ashikhmin "anisotropic" shader
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Description
New Ashikhmin "anisotropic" diffuse and specular shader.

In the paper "An anisotropic Phong light reflection model"
you can see how tweak the Nu and Nv parameters to obtain
the wishhed effect or you can visit http://www.cjb.cc/members/lordloki too.

Credits goes to Eeshlo too, by provide me a way to
obtain tangent and bitangent vectors.

Regards
Jorge

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