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A New Method of Ray-casting lrregular Data Volume for Intersection Calculation

Zhou Dinghong; Wu Enhua (Laboratory of Computer Science, Institute of Software, and Laboratory of CAD/CG,Institute of Computing Technology Academia Sinica, Beijing 100080)  
Ray casting is a useful volume rendering method for visualizing irregular data this method can produc high quality images. However, It is quite time-consuming due to the intensive intersection calculation between rays and cell facets, especially the exterior cell facets. In order to speed up the intersection, computation, an improved method is proposed in the paper by taking the advantages of polygon scan conversion algorithm for the exterior cell facets, and of geometric coherence for the interior cell facets.
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