How can I add a window to the plane

I need to add a window to the plane but I want to see the out shape from inner.

I mean the window must be transparent.

Hello! Plugin name is “csg” but they are old and maybe didnt work.
Discussiong and links: Looking for Updated plug-in for CSG - #30 by sonygod


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Have look at this example, in particular the “Smiley” shape with holes, source code lines numbers 295 - 318.


Can you use THREEJS v0.140 and try this material MeshPhysicalMaterial?

Here you can see this stuff in action.

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