How to add thickness to any flat mesh

Questions
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1

So I have this mesh:

image
image264×512 54.7 KB

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

2

The magic word for what you want to do is “extrude”.

3

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

4

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