Programming environment/tools

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(3) Specular reflection, (似鏡面反射)

I = Ks * Ip(r, g, b) * COSⁿ(alpha-angle), Ks = specular-reflection coef.

Phong illumination model

color of object = Obj (R, G, B)
                        = (Or, Og, Ob) or (light frequency)
                        where 0.0 =< Od =< 1.0