1. A method of rendering at least a portion of an image of a scene, the scene including geometric primitives, the method comprising: creating a bounding volume enclosing at least a portion of the geometric primitives of the scene; creating a statistical model for the bounding volume, wherein the statistical model represents a spatial distribution of the geometric primitives within the bounding volume; defining a screen region of the image, wherein the screen region is associated with the bounding volume and includes a set of pixels; estimating a rendering cost of the screen region from at least the statistical model of the associated bounding volume; and selecting one of at least two different renderers to render the geometric primitives enclosed by the bounding volume based on the rendering cost.