1. A system comprising: a 3-D display device with a display screen; addressing means for addressing the display screen; and a renderer having an input for a 3-D model and an input for at least one view point for rendering image information for supply to the addressing means, wherein the renderer comprises: an initial part having the input for the 3-D model and for a main view point for rendering objects in a form of a main view point Z-stack, the Z-stack comprising stack layers including color information and Z-values; a Z-stack constructor in which, from the main view point Z-stack generated by the initial stage, additional Z-stacks for additional view points are constructed; and an image information occlusion semantics stage for generating image information from the Z-stacks, wherein the renderer further comprises a depth-of-field (DOF) rendering stage, and wherein the DOF rendering stage is arranged for DOF processing of the main point view Z-stack into a blurred main view point Z-stack comprising DOF blurring.