Hi,
I'm not sure you can clone that way :
  wallRight = new Plane(wallLeft.clone(wallLeft));
wallRight = wallLeft.clone();
wallRight.x=roomWidth/2;
this.addChild(wallRight);

and set it bothsides, cause here you are looking at back and it's not
displayed in the view.

Mesh(wallRight).bothsides = true;

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