1. A graphics system including a scene manager, geometric processor means, renderer means, and a far clipping plane, said system comprising means for updating said far clipping plane based on a farthest depth value in a z-pyramid, if the farthest depth value in the z-pyramid is nearer than a depth of the far clipping plane; wherein the farthest depth value is included in a tip of the z-pyramid; wherein the tip of the z-pyramid includes a low-resolution z-pyramid with lower resolution than another z-pyramid maintained by a culling stage of the graphics system.