1. A method for minimizing an amount of data needed to test a geometry chunk in a frame against subarea boundaries in a compositing window, comprising the steps of: defining the geometry chunk with a bounding region, wherein said bounding region defines the space the geometry chunk occupies on the compositing window; sending said bounding region to each of the subareas to determine which subarea will render the geometry chunk defined by said bounding region; and communicating the geometry chunk to the subarea that will render the geometry chunk.