1. A method of representing objects located within a three-dimensional scene in spatial indexes, the method comprising: providing an object in a first position within the three-dimensional scene; generating a spatial index having nodes defining bounded volumes which partition the three-dimensional scene, wherein a first portion of the spatial index defines bounding volumes containing the object; and in response to movement of the object from the first position to a second position, modifying the first portion of the spatial index based on the second position of the object.