Include/Exclude – Allows you to disable/enable the calculation of the VRayDirt map for specific objects. Excluded objects are not shaded by the VRayDirt map. When an object is added to the list, the Image Added icon appears next to it. This determines whether the object's children are also considered. It is disabled by default.
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Affected By – Specifies a list of objects that are included in the calculation of the VRayDirt map. Excluded objects are considered "invisible" for the calculations of the VRayDirt map - they don't produce the effect over other objects. When an object is added to the list, the Image Added icon appears next to it. This determines whether the object's children are also considered. It is disabled by default.