No BSDF parameter specified to material "mtl_Material_.........."

[bardo]

Hi,
I've found an issue with node editor creating a new material.
The steps to reproduce are these:
- select an object
- add a new material using the "new" button on the material panel of the "Properties" editor
- in the node editor you'll find a Principled shader and the Material output
- delete both
- add manually a VrayMat and a Vray Output node
start a rendered viewport (or interactive render or final render) and you'll get and error message like the thread title and the material is full black.

At the moment, it's possible to workaround this using the "new" button in the Node editor or using the "Use Vray material nodetree" if you have already created the material using the "new" button in the properties editor like I've written before.

In my opinion this shouldn't happen because, as you are free to add manually the single nodes, you're not forced to use the "Use Vray material nodetree".... but this could point to issues...

[iavor_vajarov]

Hi bardo,

Thanks a lot for the exhaustive explanation of the issue.

We have indeed overlooked the New button in the Material Properties and currently it does not create a valid V-Ray Material, hence the error you see in the console. In addition, I feel that we can do better at synchronizing the availability of the output nodes in the Add Nodes menu with the actual state of the node tree. I'm creating a dev ticket for this.