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Point, Infinite light question

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Hi, I got some questions as followes : 1) Intensity of Infinite light : I(d) = I0 * cl i)What is I0 and cl ? ii)After get the I(d), then I(d) * Material_Diffuse = Final color or I(d) * Material_Specular = Final color, is it ? iii) How to get the Final color, I mean start from Material_light go through ambient, diffuse, specular, emission and to Infinite, point, spot Light ? iii)Then, where should we put in the Diffuse_light and Specular_light to the equation ? iv) How the (Infinite, point, spot) light link with (ambient, diffuse, specular, emission) light, such as in equation form? 2) Intensity of point light : I(d) = I0 * cl / Kc + Kl * d + Kq * d2 i)What is Kc, Kl and Kq ? And what is the different of them ? ii) What is the value range of them(is it 0.1 - 1.0)? iii) If I, put value 1 to Kc, the Kl and Kq should put 0, is it ? Or Kc, Kl, Kq can put in a value such as 1, at the same time (kc=1, kl = 1, kq=1) ?

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