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Controls how much the light passing through is tinted by the Refract Color and Attenuation Color.
1, only the fraction of light transmitted through the surface (See kt input) is used for caustics, At
0, all light is allowed to pass.
A value of
1, which is more physically plausible, creates darker edges around object shadows. This occurs because when light hits an object at a grazing angle, less of the light is transmitted through the object and more of it is reflected.
The fraction of light transmitted (refracted) through the surface.