in pure 3D graphics, if you are located
here: X looking in this ----> direction, and there is an ----> Object A here <--- in front of and covering ----> object B here <---, then Object B will not be rendered by the graphics engine, just like it is hidden and not visible in the real world. A general "Visual range", or "slant visual range" per se isn't modelled, just which exact objects are unobstructed in your line of view, or hidden behind other objects (and the 3D grid objects could be raindrops, snowflakes, smoke, fog, clouds, buildings, airplanes, bicycles, birds, blowing sand, trees, whatever, all in various levels of simplification, coarser or more detailed, in various resolutions, with various physical properties, transparencies and opacities). Add light sources to that, and you have an image of a represented physical world, limited by display system resolution, calculation depth, and the resolution of your eyes. I'm afraid I don't understand the question though.
Last edited by deptrai; 24th April 2015 at 19:42.