1. A method for creating a child node of a binary space partitioning tree node that better approximates the size of an object to be rendered, the method comprising: creating a binary space partitioning tree; responsive to a determination that neither a top node nor a child node in a first level of child nodes is a good approximation of the object to be rendered, modifying the binary space partitioning tree to include a new child node having boundaries that are closer to the maximum coordinates of primitives defining the object than are the boundaries of the top node and the child nodes in the first level of child nodes.