Surface glossiness Specifies the relative glossiness of the material surface.
This value is used by the renderer for the following purposes:
Integer number. Percentage number in the range 0…100. Optional for all materials. Used only for vignettes with multiple reflection maps or vignettes with 3D reflection capability. Leave empty or set to -1 if not known or not needed.
A default value is provided by the vignette if this value is set to -1.