When Using Mental-ray, your materials could disappear from your imported assets. Thankfully, just deleting namespaces can fix this issue This addresses an issue that I started noticing in Maya when using Mental ray . I noticed that when importing geo files with materials assigned to them ( .fbx or . ma) I was loosing access to my shading groups through the attribute editor. which meant I couldn't directly select my material in the Attribute Editor after grabbing my object in the Viewport. I knew the materials were still assigned. When I rendered the scene , the information was still there. When I went to the hypershade, I was was able to right-click on a material and choose " Select Objects with Material" and the objects with the Material would light up in my view-port. The material was still attached so why could't I edit it in my attribute editor?! It turns out that there is a very simple solution to this. While I can't give a definitive explanati