Merging Meshes is an add-on for Godot 4 that is designed to optimize scenes with a large number of MeshInstance3D and procedural geometry.

More info on github.

Usage

1. Download and enable the addon (Make sure that the folder is located in "addons").
2. Add a "MergingMeshes" node to your scene.
3. In the Inspector panel, add your "MeshInstance3D" nodes to the "meshes" parameter.
4. Optional: Assign a "Material3D" to the "GeneralMaterial" parameter to set the material for the merged mesh or use Original mesh materials.
5. Recommended: Keep the HideSource parameter enabled to automatically hide the original MeshInstance3D nodes.
6. Recommended: Keep the "HideSource" parameter enabled to automatically hide the original "MeshInstance3D" nodes.

Features:

UV and material support. Clear and minimal code. Convenient API - you can use this code in your tools!