Explaining the optical parameters

The RTP Demo uses a very simple illumination equation. The optical parameters of this equation are the following:

color (R, G, B):

this is the color of the surface defined by the three parameters Red, Green and Blue

K_d:

the difuse reflection coefficient indicates what percent of the incident light is reflected diffusely. As an example, mate paper would have K_d=1.0

K_s:

the specular reflection coefficient indicates what percent of the incident light is reflected specularly. As an example, a mirror would have K_s=1.0

K_t:

the transparency coefficient indicates what percent of the incident light is transmitted through the surface. An opaque surface has K_t=0.0 and a totally transparent one has K_t=0.0

shine:

this coefficient indicates the glossyness or shinyness of a surface. For a light source, it indicates its intensity

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