Use this command to expand or reduce the size of the view frustum. The view frustum is the pyramidal viewing volume. Any geometry not within the view frustum is automatically culled from the scene. This can be used as an effective way to handle a large scene database without drastically affecting performance.

Large clipping ranges (e.g., viz.clip(.1, 100000)) compared to small ranges (e.g., viz.clip(.5, 100)) can result in undesirable jagged artifacts due to hardware z-buffer resolution limitations.