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Definition
Total integrated scattering (TIS) describes how much light is deviated (or scattered) from the incident light direction by diffuse reflection and transmission from a surface or optical element. It is equal to the ratio of diffuse reflected and transmitted optical power to the incident optical power when light is incident upon a surface.
TIS = (diffuse reflectance radiant flux + diffuse transmittance radiant flux) / [(specular reflectance power + specular transmittance power) + (diffuse reflectance power + diffuse transmittance power)]
This implies that TIS is a unitless number with a value between 0 and 1.