Detail this asset from Unity Asset Store: Original Link
This is a paid asset, but now you can download Mesh Baker Free.
Mesh Baker v3.30.3
Mesh Baker v3.29.1
Mesh Baker v3.28.1
Combine meshes and materials to reduce draw calls.
Fix models and create atlases so they can share materials (for static/dynamic batching)
Fix scaling, rotation and translation in imported models
* Create Texture Arrays
* Works with any material and shader
* Full multiple material support
* Combine and customize skinned meshes
* UVs, Normals, Tangents automatically adjusted
* Bake tiling textures
* Full lightmapping support
* Source assets not touched
* Easy, no scripting, learn in 5 minutes
* Runtime API
* Can handle negative scaling
Now also available… Mesh Baker LOD!
(Requires Mesh Baker)