I want to specify the reflection, ambient and diffuse value of every 
point from a given surface as a function of the world coordinates of 
that point. In other words:

finish { reflection {u(x, y, z), v(x, y, z)} ambient f(x, y, z) diffuse 
g(x, y, z) }

where u, v, f, g are R^3 -> [0, 1]^3 functions mathematically.

How to do this in POV-Ray?

Will ever POV-Ray support syntax which permits expressions similar to 
the above?

Thank you,
William

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