A Ray tracing algorithm for progressive radiosity
A Ray tracing algorithm for progressive radiosity
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DOI：
10.1145/74333.74366
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发表时间：
1989-07
期刊：
影响因子：
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通讯作者：
Michael F. Cohen;D. Greenberg;Shenchang Eric Chen;John R. Wallace;John R. Wallace;K. Elmquist
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文献类型：
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作者：
Michael F. Cohen;D. Greenberg;Shenchang Eric Chen;John R. Wallace;John R. Wallace;K. Elmquist
提出了一种新的渐进辐射度方法中计算形状因子的方法。以前，渐进式光能传递方法依赖于使用半立方体算法来确定形状因子。然而，半立方体算法中固有的采样问题限制了其对复杂图像的有用性。一个更强大的方法，其中射线跟踪是用来执行的形状因子方程的数值积分。该方法是定制的，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不断增加的精度为更高数量的射线。定量分析得出的形状因子和光线跟踪的形状因子之间的比较。
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.