Extension of validity calculation to moving objects within a virtual reality system using frame-to-frame coherence
F. Duckstein · The Journal of Visualization and Computer Animation · 1998
Generating pictures of a complex scene in real time with constant frame rates still overwhelms modern rendering systems. The exploitation of frame-to-frame coherence offers a solution to this problem by reusing the images of rendered objects multiple times. Combining this with a cost metric and an LOD system delivers a uniform frame rate system with little additional effort. The basis of reusing images is a validity calculation to decide how far the original and the image might differ. The application is restricted to fixed objects and fixed spaces. This paper presents an extension of the existing validity calculation to handle moving objects, which are now standard e.g. in the virtual reality description language VRML 2.0.11 The additional deviation resulting from object movement is estimated together with viewpoint movement, resulting in one scalar error value for further processing. © 1998 John Wiley & Sons, Ltd.