23. The method of claim 22, wherein the step of calculating bounding volume further comprises the step of: transforming all objects from world space coordinates into a coordinate space relative to said occluder node.
23. The method of claim 22, wherein the step of calculating bounding volume further comprises the step of: transforming all objects from world space coordinates into a coordinate space relative to said occluder node. 24. The method of claim 23, wherein for each occluder in said scene, normals representing said occlusion volume are stored with said object by associating a linked list of bounding volume normals with each shape node in a scene graph.