Displacement - enables (default) or disables V-Ray's own displacement mapping. Note that we also support the SketchUp's displacement feature.
Force back face culling - enables or disables (default) back face culling for camera and shadow rays. When this option is on, the surfaces of objects which are turned away from the camera (or the light source, when tracing shadows) will appear fully transparent. This allows to look inside closed objects when the camera is outside.