How do I quickly replace all the materials in a scene with gray to adjust the lighting?

Mtl. Override - what is it?

Corona Render has a handy feature to replace all scene materials with a gray regular CoronaMtl. Working with Mtl. Override has become easier.

You only need to check one box and you can adjust the lighting in the sermat.
Material override knows how to exclude self-luminous materials, glass and portals.
You can also save Displacement and see unsupported materials.

Have a good rendering!
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