Pixel-selected ray-tracing
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Ray-tracing is a very powerful method of generating realistic synthetic images. However, the conventional ray-tracing technique requires complicated computation for each pixel in the image and a long processing time. Advantage is taken of the similarity among neighboring pixels, and ray-tracing is executed only to certain selected pixels while using interpolation to determine the value of other pixels. A pixel-selected ray-tracing algorithm is proposed. This paper presents first a description of the pixel-selected ray-tracing concept/algorithm. Then methods of determining whether a pixel value should be calculated by ray-tracing or by interpolation are discussed. Experiments were conducted to compare the proposed method with the standard ray-tracing method. Experimental results indicated that the proposed method required only 20 to 63 percent of the computation time of the standard method, while rendering a comparable level of image quality.
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