V-Ray User Scalar texture parameters
Search Keywords: user attributes
The VRayUserScalar node is a utility shading node that can be used to render the value of a specified V-Ray user attribute assigned to an object.
User attribute name - this is name of the user attribute that will be looked up and returned from this shading node.
Default value - specifies the value to return if the user attribute is not found on the shaded object.
Required format for attribute name - shows possible formats for the attribute in the V-Ray User Attributes string assigned to the object, and what will be rendered as a result.