Fog

[Gladsomebeast]

Unfortunately for your purposes, the level of fog is set for scenes and not windows. To work around this, you can have the small window look at a different scene. After you have created your small window, create a new viewpoint, set its scene, then tell your window to use the new viewpoint. If you want this scene to have the same 3D models as your original scene call <VizNode>.duplicate( sceneNumber ) on all objects you want to appear in the second scene.