Append vertices from a given [Mesh] surface onto the current vertex array with specified [Transform].
+ [b]Note:[/b] Using [method append_from] on a [Thread] is much slower as the GPU must communicate data back to the CPU, while also causing the main thread to stall (as OpenGL is not thread-safe). Consider requesting a copy of the mesh, converting it to an [ArrayMesh] and adding vertices manually instead.
Rémi Verschelde