title: How to clear editor.scene before loading a new file?
body: <p>Working in editor, loading a new geometry, I am trying to query the scene and remove existing geometries. The editor.scene.children and editor.scene.__webglObjects are both undefined. If I console.log( editor.scene ); and expand the object the children and __webglObjects have the elements I am trying to access. My clicker fingers are getting worn out trying to understand this.</p>