How to simplify a model with Blender - Jeanmilost-Godot/Godot GitHub Wiki

Sometimes a complex model should be simplified in order to apply it to a collider. Below is the way to achieve that:

Open Blender (here the v4.0 is used), and load the model to simplify.

Select the Edit mode.

Select all the vertices to simplify (Ctrl + A).

In the Mesh context menu, select Clean up -> Decimate Geometry.

Select the ratio. The less the value will be, the most the model will be simplified.

Once simplified, save the model back as a glTF 2.0 (.glb) file.