Abstrac tOne method of directly rendering a three-dimensional volume of scalar data is to project each cell in a volume ont o the screen . Rasterizing a volume cell is more complex tha n rasterizing a polygon . A method is presented that approximates tetrahedral volume cells with hardware renderabl e transparent triangles . This method produces results wliiel i are visually similar to more exact methods for scalar volum e rendering, but. is faster and has smaller memory requirements . The method is best suited for display of smoot hlychanging data .
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