Rhino purges component materials of VRay's two-sided materials

[mich.platter]

As the title says, when i run Rhino’s Purge command with the materials option, it purges materials that are not in the scene themselfs but are part of a two-sided material in VRay. Not sure if its for Rhino or VRay to fix it, but its kind of annoying.

[Micha]

It’s a problem of limited code at the Rhino side. Also I’m curious for a solution. Can you help @andy ?

Vray - Fur Material dissapears after Purge

Hi Miruna Vecerdi, The problem is that Rhino lets a plugin know that a material is deleted only after it is deleted. So there is nothing we can do to protect the material in advance. From Rhino’s perspective it is all OK (as you said). There is a way, of course, to “protect” a fur/clipper material from being purged - if we assign such a material of interest to a certain object in the scene, and then Rhino will not see it as redundant. However that has its drawbacks: There is an assignment d…