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Real-time global illumination method for sub-surface scattering object on the basis of radiosity

A technology of subsurface scattering and global illumination, which is applied in computing, 3D image processing, image data processing, etc., can solve problems such as unacceptable speed, and achieve the effect of real-time material replacement

Inactive Publication Date: 2015-03-11
BEIHANG UNIV
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Problems solved by technology

[0016] The technical problem to be solved by the present invention is: in the methods proposed so far, although path-tracing and ray-tracing can solve the global illumination problem of subsurface objects, the speed is unacceptable, and the pre-calculated radiance algorithm can only handle infinite Global illumination of subsurface objects with far light and ambient light

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  • Real-time global illumination method for sub-surface scattering object on the basis of radiosity
  • Real-time global illumination method for sub-surface scattering object on the basis of radiosity
  • Real-time global illumination method for sub-surface scattering object on the basis of radiosity

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0047] The global illumination process of the subsurface scattering object based on the radiosity algorithm of the present invention is as follows: figure 1 , and its implementation is as follows:

[0048] 1) Precalculate the energy transfer matrix

[0049] The pre-computation stage is mainly divided into two steps. The first step is the calculation of the energy transfer matrix between the patches, which is denoted as F. This step can be obtained by using the shape factor calculation formula in the radiosity algorithm. The derivation formula of the shape factor is:

[0050] F ij = 1 A i ∫ ∫ V ( x , y ) cos ...

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Abstract

The invention provides a real-time global illumination method for a sub-surface scattering object on the basis of the radiosity, which is mainly divided into three steps of: 1) pre-calculating: pre-calculating an energy transmission matrix of a scene by the traditional approximate dipole model and the radiosity, and storing in a sparse matrix mode; 2) calculating an energy transmission process by a quick sparse matrix library of a GPU (Graphics Processing Unit), and obtaining energy acquired by each surface patch; and 3) obtaining the final global illumination effect by a quick photon collection algorithm. On the basis of the certain pre-calculation basis, the real-time global illumination effect for the sub-surface scattering object can be obtained.

Description

technical field [0001] The invention relates to a real-time global illumination method of a subsurface scattering object based on a radiosity algorithm. Background technique [0002] In realistic rendering, the radiosity algorithm plays an important role in physically realistic rendering, especially in global illumination, he regards the propagation of light as a kind of energy propagation, and interprets light as discrete particle energy Therefore, it has a good physical basis, and can realistically realize any effect except light diffraction and interference through various improvement methods. [0003] Subsurface scattering refers to the light transmission process in which light enters an object from a certain point on the surface of the object, is scattered internally, and finally exits from other vertices on the surface of the object. Objects with subsurface scattering properties generally have a more rounded appearance and color, and this phenomenon is more obvious on...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/50
Inventor 王莉莉石裕隆王泽赵沁平
Owner BEIHANG UNIV
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