"here_I_am" <nomail@nomail> wrote:
> human face with its texture and shadow map but that doesn't look any way close
> to real face I mean that it has plasticity kinda look.
> And my sole purpose to use Torrance-Sparrow BRDF model is to make this face
> model somewhat more realistic.But I am not sure how implement that.

you see, you don't know what you're talking about.  Why do you think the
Torrence-Sparrow BRDF model will help you getting away from the plastic look?

What you really need is a BSSRDF (subsurface scattering).  Look here for the
comparison:
http://graphics.ucsd.edu/~henrik/images/imgs/face_brdf.jpg
http://graphics.ucsd.edu/~henrik/images/imgs/face_bssrdf.jpg

from the man himself, Henrik Wann Jensen, the father of photon mapping and
subsurface scattering models...

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