RT_FALLOFFΒΆ

RT_FALLOFF_NONE No light falloff.
RT_FALLOFF_INVERSE_CLAMPED Clamped inverse light falloff.
RT_FALLOFF_SQUARE_CLAMPED Clamped square light falloff.
RT_FALLOFF_LINEAR Linear light falloff.
RT_FALLOFF_INVERSE Inverse light falloff.
RT_FALLOFF_SQUARE Square light falloff.
RT_FALLOFF_STEP Step light falloff.