When this happens, I have to hope that I saved the file recently before this happened and reopen it. Its Vrays proprietary format essentially. So I'll be working, and if I have multiple materials applied to different objects in a group, the entire group of objects will turn grey and I lose all of my materials. Crtrl+Z does not help in this case. mat format is 3ds maxs core material format which can represent any material that you make within 3ds including materials for other render engines.vrmat is a more specific file type which, in max, can only be exported from a material that is under the vray rollout in the material editor. What's worse, occasionally materials will disappear from the scene itself. I have to hit Ctrl+Z every time I open the editor and it's an extra step I shouldn't have to take. If I open the Vray material editor with no objects selected, a random material will disappear from the editor. If I hit Ctrl+Z the material will reappear, but it's extremely frustrating and annoying to deal with. Meaning it just turns into flat grey v-ray material, and all my settings are gone. You can get access to this 8GB file only after Subscribing my Channel.Get 8GB V-ray Material Library for SketchUp absolutely free Vray Material LibraryYou. If I have an object selected, and I open the Vray material editor, the material that is applied to whatever object I have selected disappears from the editor. I'm having a very weird issue with the latest version of Vray for Max 2017.
