why some .mat file can be edit but some .mat can't?

[henryhenry]

The material I created can be edited by double clicking it.

but the material from plugins or somewhere else cannot. Why?

[silent]

Hi Henry,

Not all materials are being created in Material Graph, some of them can be inherited from the default uber material (mesh_base). So if you need to adjust such material you can do it from the Parameters tab by changing pre-defined set of options (via sliders, checkboxes and so on).