I have some objects here that are extramly complex shapes. When you look at them in Vue there displayed as flat plains but they are 3d shapes and render properly. That type of shape will never work with the drop command. The way to do the shape like that is the hard way. Turn on open gl in a new scene, import shape and place by hand the trees, Then group the whole works and save as a single object. Import in you working scene. Don't use the drop command on it ever cause it will break it.