1. A method for providing simple generalized conservative visibility, comprising the steps of: providing one or more occluder nodes, wherein said one or more occluder nodes are planes having a given width and height in object space that block the rendering of objects behind them in world space; providing an activationDistance field which specifies how far a camera must be from an occluder node for said occluder node to be active; using said one or more occluder nodes to compute a conservative set of visible objects from a current view point; and rendering said conservative set of visible objects.