How do I modify all materials at once

Development Rendering
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1

There is no easy way to do that. If you had created the materials yourself, you could have used a collection parameter and set the value for all of them but now you’ll have to modify them one by one.

2

When you select and then drag&drop materials on a single mesh only the last selected material is applied to the material ID slot of the surface you drop onto.

3

I have currently 592 materials imported from FBX files and I would like to modify the spectacular attributes of all materials at once.
What is the best way to do that?

4

Thanks. That is bad news.
I have 142 FBX with 4 LoD each.
A bulk editing capability would be great in future release.

Can I apply two materials at once to a same mesh?