When a lobe on pxrsurface is disabled, set the gain to 0 in the rib (if not hooked up to a vstruct)
When a lobe on pxrsurface is disabled, set the gain to 0 in the rib (if not hooked up to a vstruct)

prman-pixar/RenderManForBlender,prman-pixar/RenderManForBlender,adminradio/RenderManForBlender