渐进式射线追踪算法

Proceedings of the 16th annual conference on Computer graphics and interactive techniques Pub Date : 1989-07-01 DOI:10.1145/74333.74366

Michael F. Cohen, D. Greenberg, Shenchang Eric Chen, John R. Wallace, John R. Wallace, K. Elmquist

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引用次数: 295

摘要

提出了一种基于渐进式辐射法计算形状因子的新方法。以前，渐进式辐射方法依赖于使用半立方算法来确定形状因素。然而，半立方算法固有的采样问题限制了它对复杂图像的适用性。描述了一种更健壮的方法，其中光线追踪用于执行形状因子方程的数值积分。该方法是量身定制的，以提供良好的，近似的结果，为低数量的射线，同时仍然提供一个平滑的连续体，提高精度的射线数。给出了解析导出的形状因子和射线追踪的形状因子之间的定量比较。

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A Ray tracing algorithm for progressive radiosity

A new method for computing form-factors within a progressive radiosity approach is presented. Previously, the progressive radiosity approach has depended on the use of the hemi-cube algorithm to determine form-factors. However, sampling problems inherent in the hemi-cube algorithm limit its usefulness for complex images. A more robust approach is described in which ray tracing is used to perform the numerical integration of the form-factor equation. The approach is tailored to provide good, approximate results for a low number of rays, while still providing a smooth continuum of increasing accuracy for higher numbers of rays. Quantitative comparisons between analytically derived form-factors and ray traced form-factors are presented.

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Proceedings of the 16th annual conference on Computer graphics and interactive techniques

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