Graphics processing renders a scene with a plurality of different rendering parameters for different locations on a screen area. Graphics depicting one or more objects mapped to a screen area are processed. The screen area includes a plurality of zones, each having a different set of rendering parameters. Primitives belonging to one of the objects that covers at least two of the zones are received. Each primitive is assembled to screen space by iterating each primitive over each zone it covers using the rendering parameters of the respective zone with each iteration.