How to add thickness to any flat mesh

So I have this mesh:

How can i add thickness to it? Even with that Rectangle hole inside

The magic word for what you want to do is β€œextrude”.

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see
Shapes
WallBuilding
ExtrudeFromPoints
ExtrudeBufferGeometry
from the Collection of examples from discourse.threejs.org

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It’s always good to explore official examples: three.js examples

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