How to make the whole 3d world darker except one object?

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:bust_in_silhouette: Asked By TobiLa

I want to temporarily highlight one specific meshInstance in my 3D world.
For this, I want everything else to be rendered a little bit darker.

The object shouldn’t be affected and still look the same.

Is this possible without running something every single object in the world?
Maybe adding a global effect and making my object an exception?

I am using Godot 3.1.