“A shading reuse method for efficient micropolygon ray tracing”
Conference:
Type(s):
Title:
- A shading reuse method for efficient micropolygon ray tracing
Session/Category Title: Shading and Shadows
Presenter(s)/Author(s):
Abstract:
We present a shading reuse method for micropolygon ray tracing. Unlike previous shading reuse methods that require an explicit object-to-image space mapping for shading density estimation or shading accuracy, our method performs shading density control and actual shading reuse in different spaces with uncorrelated criterions. Specifically, we generate the shading points by shooting a user-controlled number of shading rays from the image space, while the evaluated shading values are assigned to antialiasing samples through object-space nearest neighbor searches. Shading samples are generated in separate layers corresponding to first bounce ray paths to reduce spurious reuse from very different ray paths. This method eliminates the necessity of an explicit object-to-image space mapping, enabling the elegant handling of ray tracing effects such as reflection and refraction. The overhead of our shading reuse operations is minimized by a highly parallel implementation on the GPU. Compared to the state-of-the-art micropolygon ray tracing algorithm, our method is able to reduce the required shading evaluations by an order of magnitude and achieve significant performance gains.
References:
1. Burns, C. A., Fatahalian, K., and Mark, W. R. 2010. A lazy object-space shading architecture with decoupled sampling. In Proceedings of HPG 2010, 19–28. Google ScholarDigital Library
2. Christensen, P., Fong, J., Laur, D., and Batali, D. 2006. Ray tracing for the movie ‘cars’. In Symposium on Interactive Ray Tracing, 1–6.Google Scholar
3. Cook, R. L., Porter, T., and Carpenter, L. 1984. Distributed ray tracing. SIGGRAPH Comput. Graph. 18, 3 (January), 137–145. Google ScholarDigital Library
4. Cook, R. L., Carpenter, L., and Catmull, E. 1987. The Reyes image rendering architecture. SIGGRAPH Comput. Graph. 21, 4 (August), 95–102. Google ScholarDigital Library
5. Fatahalian, K., Luong, E., Boulos, S., Akeley, K., Mark, W. R., and Hanrahan, P. 2009. Data-parallel rasterization of micropolygons with defocus and motion blur. In Proceedings of HPG 2009, 59–68. Google ScholarDigital Library
6. Fatahalian, K., Boulos, S., Hegarty, J., Akeley, K., Mark, W. R., Moreton, H., and Hanrahan, P. 2010. Reducing shading on GPUs using quad-fragment merging. ACM Trans. Graph. 29, 4 (July), 67:1–67:8. Google ScholarDigital Library
7. Fisher, M., Fatahalian, K., Boulos, S., Akeley, K., Mark, W. R., and Hanrahan, P. 2009. DiagSplit: parallel, crack-free, adaptive tessellation for micropolygon rendering. ACM Trans. Graph. 28, 5 (December), 150:1–150:10. Google ScholarDigital Library
8. Hou, Q., Qin, H., Li, W., Guo, B., and Zhou, K. 2010. Micropolygon ray tracing with defocus and motion blur. ACM Trans. Graph. 29, 4 (July), 64:1–64:10. Google ScholarDigital Library
9. Igehy, H. 1999. Tracing ray differentials. In Proceedings of ACM SIGGRAPH ’99, 179–186. Google ScholarDigital Library
10. Parker, S. G., Bigler, J., Dietrich, A., Friedrich, H., Hoberock, J., Luebke, D., McAllister, D., McGuire, M., Morley, K., Robison, A., and Stich, M. 2010. OptiX: a general purpose ray tracing engine. ACM Trans. Graph. 29, 4 (July), 66:1–66:12. Google ScholarDigital Library
11. Patney, A., and Owens, J. D. 2008. Real-time Reyes-style adaptive surface subdivision. ACM Trans. Graph. 27, 5 (December), 143:1–143:8. Google ScholarDigital Library
12. Ragan-Kelley, J., Lehtinen, J., Chen, J., Doggett, M., and Durand, F. 2011. Decoupled sampling for graphics pipelines. ACM Trans. Graph. 30, 3 (May), 17:1–17:17. Google ScholarDigital Library
13. Stoll, G., Mark, W. R., Djeu, P., Wang, R., and Elhassan, I. 2006. Razor: An architecture for dynamic multiresolution ray tracing. Tech. rep., The University of Texas at Austin.Google Scholar
14. Wexler, D., Gritz, L., Enderton, E., and Rice, J. 2005. GPU-accelerated high-quality hidden surface removal. In Proceedings of Graphics Hardware 2005, 7–14. Google ScholarDigital Library
15. Whitted, T. 1980. An improved illumination model for shaded display. Commun. ACM 23, 6 (June), 343–349. Google ScholarDigital Library
16. Zhou, K., Hou, Q., Wang, R., and Guo, B. 2008. Real-time kd-tree construction on graphics hardware. ACM Trans. Graph. 27, 5 (December), 126:1–126:11. Google ScholarDigital Library
17. Zhou, K., Hou, Q., Ren, Z., Gong, M., Sun, X., and Guo, B. 2009. RenderAnts: interactive Reyes rendering on GPUs. ACM Trans. Graph. 28, 5 (December), 155:1–155:11. Google ScholarDigital Library
