How to add an additional wave shader to all existing 3D meshes at once in Godot 4?

Godot Version 4.5

How to add an additional wave shader to all existing meshes at once in Godot 4, like you see e.g. in Splatoon.

Or is there a global shader addition to meshes?

Thanks

Mike

Get mesh instances and assign the material to their material_overlay property.

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