Combine multiple MeshInstance3D into 1 MeshInstance3D

nines · October 25, 2024, 12:37pm

Godot Version

4.3

Question

Is it possible to “combine” multiple MeshInstance3D into 1 single MeshInstance3D in Godot via gdscript, like in Blender combining 2 3D models together?

snipercup · October 27, 2024, 1:01pm

Not saying it’s easy, but if your MeshInstance3D has a mesh, you can use this:
MeshInstance3D

So you’d call mesh.surface_get_arrays(), then instantiate the ArrayMesh and call the add_surface_from_arrays function. Repeat this for every mesh you want to combine into one mesh.

You can then set the arraymesh as the mesh for your meshinstance3d. I doubt it will leave any texture you might have on your mesh intact.

I use arraymesh for a different purpose, but you can see how the mesh is set and a material is applied:

github.com

Khaligufzel/Dimensionfall/blob/305c0061ee8e5e100890da0507885812f900a3a9/Scripts/Chunk.gd#L1166-L1177


      
          		# Create a MeshInstance3D for each level with the prepared mesh data
          		var mesh = ArrayMesh.new()
          		mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, arrays)
          
          		# Apply the shared atlas texture to a StandardMaterial3D
          		var material = StandardMaterial3D.new()
          		material.albedo_texture = atlas_texture
          
          		# Create and configure the mesh instance for the level
          		var mesh_instance = MeshInstance3D.new()
          		mesh_instance.mesh = mesh
          		mesh.surface_set_material(0, material)

system · December 31, 2024, 4:03pm

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