Visiblity Streaming for Network-based Walkthroughs

In network-based walkthroughs the server transmits online only the primitives which are potentially visible from the client’s current viewpoint (visibility streaming). To reduce the bandwidth requirements it is necessary to minimize the set of view-dependent potentially visible primitives using occlusion culling techniques. However, even a slight change in the viewpoint might require the computation and transmission of many new primitives and thus latency is inevitable. In this paper we present an algorithm for determining a conservative superset of an -neighborhood of a given viewpoint. Having such an -superset, the client is free to render the model independently of the server as long as he moves within that -neighborhood.