Access to and transmission of 3D models over networks becomes increasingly
popular. However, the performance and quality of access to remote 3D models
strongly depends on system load conditions and the capabilities of the var
ious system components, such as clients, servers, and interconnect. The net
work graphics framework (NGF) integrates various transmission methods for d
ownloading 3D models in a client-server environment. The NGF automatically
selects the optimal transmission method for a given pair of client and serv
er, taking into account characteristics of the model to be transmitted, cri
tical environment conditions, user preferences and the capabilities of the
client and the server. The NGF aims to provide constant quality of service
across different clients and under varying environment conditions. (C) 1999
Elsevier Science Ltd. All rights reserved.