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# 1.9 Photon

Basic

The basic photon shader supports diffuse reflection and specular reflection and transmission/refraction.

        color "mib_photon_basic" (
            color           "diffuse",
            color           "specular",
            color           "transp",
            scalar          "ior_frac")

diffuse is the diffuse color.

specular is the specular color, which controls reflectivity.

transp is the fraction of light transmitted.

ior_frac is the refraction index ratio. It is used if the photon material is transparent.