In the Phong model, as typically expressed, there’s a diffuse color, expressed as an RGB triple,…

In the Phong model, as typically expressed, there’s a diffuse color, expressed as an RGB triple, and a diffuse reflectance.

(a) Make a conjecture about why these are not combined into a single RGB triple, since they are, after all, multiplied together in the model.

(b) The diffuse and specular colors in the Cook-Torrance model are specified by RGB triples (or more generally, by spectral distributions). Why do you suppose the specular exponent does not get expressed as an RGB triple?

(c) Suppose that the entire model was divided up by wavelength so that the specular exponent could vary from color to color. Suppose the red exponent was 3, while the blue and green exponents were 5, and that both the diffuse and specular colors were pure white. What would be the appearance of the specular highlight from a white point light?

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