Coloring reuse method for micro-polygon ray tracing

Abstract

The invention discloses a coloring reuse method for accelerating micro-polygon ray tracing, wherein the coloring computation is greatly reduced on the premise that the rendering quality is ensured, and the rendering efficiency is improved. According to the coloring reuse method, firstly, a group of coloring rays with the number specified by a user is projected from an image space, and coloring values computed according to the rays are assigned to an anti-aliasing sample through nearest neighbor searching. In order to reduce the interferential reuse of different types of optical paths, different layers are marked out according to the first reflection type of the optical paths, and each layer undergoes coloring sampling. Compared with the existing coloring reuse technology, the coloring reuse method has no need to explicitly indicate the mapping mode of objects to image space, and can also process the ray tracing effects such as refection and refraction more concisely. The coloring reuse method can be realized in a highly-parallelized mode based on graphic processing hardware, and the efficiency of the micro-polygon ray tracing is increased by an order of magnitude.

Description

technical field [0001] The invention relates to the technical field of graphics drawing, in particular to a micro-polygon-oriented ray tracing method. Background technique [0002] Shading is often the performance bottleneck for film-quality rendering. This rendering is usually based on the Reyes architecture, which uses micropolygons to represent high-order surfaces or very fine-grained objects. For the definition of Reyes architecture and micropolygons, please refer to: COOK, R. L., CARPENTER, L., AND CATMULL, E. 1987; The Reyes image rendering architecture. SIGGRAPH Computer Graphics 21, 4 (August), 95–102. In order to reduce the cost of shading, advanced micro-polygon renderers (such as RenderMan from Pixar) perform shading calculations on the vertices of micro-polygons, and then reuse the shading values ​​to calculate the color of each visibility sample (or anti-aliasing sample), and then synthesize the final image. Such a shading reuse strategy can make the shading ...

AI Technical Summary

Problems solved by technology

However, the same approach cannot be used to handle effects such as specular reflections in ray tracing, because these effects involve a non-continuous mapping of objects into image space, which cannot be effectively handled by the image space methods described above

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