Quote -  No, not useless. As bagginsbill has said, if you do not have an environment, using an IBL will create one for you, surrounding your scene with the luminance values of the color map used in the IBL's material. IDL takes that into account, so it was needed here.

I agree but you increase your render time, cause you use IC for IDL and IC for IBL

Logicaly if you use IBL you dont need IDL !

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