Deletes all objects from the scene, while retaining the rendering setup (lights, cameras, shaders, environments) so that you can import a new model into the same rendering setup and shade it immediately.
For more information, see Utilities > SBD > Open SBD Window.
Turn this on (default) if you are importing a wire file with materials already assigned to the geometry. Turn it off if you are importing a neutral file format (for example, IGES) so that you can use the materials already in your session.
Turn this on to remove all the lights in your session. Turn if off to retain the same illumination.