A Method for Unpolarized Photon Mapping in Participating Media

A photon mapping and photon technology, applied in the field of unbiased photon mapping and drawing, which can solve problems such as errors

Active Publication Date: 2018-07-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While giving full play to the high-efficiency characteristics of the photon mapping drawing method in medium drawing, the present invention solves the error problem caused by approximate estimation in the method

Method used

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  • A Method for Unpolarized Photon Mapping in Participating Media
  • A Method for Unpolarized Photon Mapping in Participating Media
  • A Method for Unpolarized Photon Mapping in Participating Media

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Experimental program
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Embodiment

[0181] The inventor implemented the method described above on a computer equipped with an Intel i5 3.00GHz dual-core central processing unit and 16GB of memory, and implemented other drawing methods closely related to our method to generate the rendering in the figure result.

[0182] Experimental results ( image 3 ) show that our improved joint method significantly outperforms traditional bidirectional path tracing and photon mapping methods in media rendering. Compared with the bidirectional path tracing method, the convergence effect of our method is obviously better. Compared with traditional photon mapping methods, our method has obvious advantages in the unbiasedness of the results while maintaining the high efficiency of the method. after Figure 4 Considering the factor of photon gathering radius, the rendering performance of our method in medium rendering is significantly smaller than that of the traditional photon mapping method. The gathering radius has signific...

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Abstract

The invention discloses a method for drawing unbiased photon mapping in the presence of a medium. The method improves the unbiased photon gathering method from aspects such as improving subpath sampling technology, reforming theory formula, sampling importance of unbiased item estimation, and discussing medium boundary conditions, etc., which enable continuous obtaining of unbiased drawing results in the scenario of the presence of the medium. According to the invention, improvement is made to the weight of multiple importance sampling so as to combine the method for drawing unbiased photon mapping in the presence of the medium with a bidirectional light ray tracking technology, which enables the two methods to simultaneously exhibit advantages under different contexts.

Description

technical field [0001] The invention relates to the technical field of media rendering, in particular to a non-polarized photon mapping rendering method in a participating medium. Background technique [0002] The core idea of ​​photon mapping is to use the density of photons to estimate local light energy. For details, please refer to JENSEN, H.W.2001. Realistic Image Synthesis Using Photon Mapping. A.K.Peters, Ltd., Natick, MA, USA. The locality of photon collection makes this method particularly effective for challenging caustics and indirect lighting with multiple bounces. In addition, photon mapping can reuse the optical path corresponding to the photon, thereby reducing the cost of sampling. Density estimation can effectively reduce noise, but it also introduces bias to the final result, so all previous photon mapping methods are biased. Although the latest series of progressive photon mapping methods can consistently converge to the correct result when the number of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/06G06T15/08
CPCG06T15/06G06T15/08
Inventor 侯启明任重丁珂秦昊
Owner ZHEJIANG UNIV
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