toInstancingMesh() {

		throw new Error( 'InstancedMesh optimization not implemented yet' );

	}
Performs the auto-instancing by identifying groups of meshes in the scene
that can be represented as a single {@link InstancedMesh}. The method modifies
the scene by adding instances of `InstancedMesh` and removing the now redundant
individual meshes.

This method is not yet implemented.

@abstract
@return {Scene} The optimized scene.