Thank you very much → with checking first if the meshes are already defined it’s working fine.
I have another question to DragControl: when i import my industriel robots, i load the parent part in the objects array. Unfortunatly i can drag each part individual around. The parent part takes all parts, but the rest is just moving without the whole robot (–> only a child). Is there a way to take the whole robot as one part or to just make the parent able to drag around? 