There’s always something in the Blend amount slot - if there isn’t a texture then V-Ray users the color.
When the “additive mode” option is OFF, the material blends the result starting from the base material and applying the coat layers on top of it. Coat layers with bigger “amount” values dim those before them, so energy preservation is always ensured.
When “additive mode” is ON, energy preservation is not guaranteed. We don’t recommend using this mode.
Hi Vlado, "When “additive mode” is OFF, energy preservation is not guaranteed. We don’t recommend using this mode.
", additive mode ON or OFF which you mean here?