Multiple-light source rendering method based on virtual spherical light sources

A technology of multiple light sources and light sources, applied in the field of multi-light source rendering based on virtual spherical light sources, can solve the problems of lack of lighting effects, limited contribution range of virtual point light sources, and illuminance spikes, so as to avoid distortion, improve rendering effects, and improve rendering effects. Effect

Inactive Publication Date: 2014-12-10
ZHEJIANG UNIVERSITY OF MEDIA AND COMMUNICATIONS
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Problems solved by technology

Second, the light beam of the point light source is concentrated. In the case of multiple point light sources, it will cause a spike in illuminance, causing the light intensity in some positions to be significantly greater than that in other places. In order to prevent the peak illuminance caused by the angle, the contribution of the virtual point light

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  • Multiple-light source rendering method based on virtual spherical light sources
  • Multiple-light source rendering method based on virtual spherical light sources
  • Multiple-light source rendering method based on virtual spherical light sources

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Embodiment Construction

[0035] The present invention is further explained in conjunction with embodiment and accompanying drawing now.

[0036]Step 1, establish each virtual spherical light source according to the scene.

[0037] Use the two-way path tracing method to determine the spherical center coordinates of each virtual spherical light source, and then determine the specifications of the virtual spherical light source according to the local density of light determined in the scene: for each virtual spherical light source, use its spherical center coordinates as the search center, The preset search step size, which is 1 pixel in this embodiment, searches around, and continuously expands the search radius according to the search step size until the centers of the specified number of adjacent virtual spherical light sources are included within the range of the sphere. In this embodiment The sphere needs to contain the centers of 8 adjacent virtual spherical light sources, and then the search radiu...

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Abstract

The invention discloses a multiple-light source rendering method based on virtual spherical light sources. The multiple-light source rendering method comprises the step 1 of establishing the virtual spherical light sources according to scenes, the step 2 of calculating the illumination intensity of each point on a sampling surface by use of the virtual spherical light sources, the step 3 of building an illumination intensity matrix of the virtual spherical light sources on the sampling surface, and obtaining the illumination intensity of each point on the sampling surface by virtue of matrix overlaying to obtain the final rendering result. The multiple-light source rendering method based on the virtual spherical light sources is characterized in that the light energy of a point light source is distributed by use of the virtual spherical light sources, a smooth surface can be well supported and distortion of scenes is avoided. In addition, the efficiency of the rendering process of the multiple-light source rendering method is greatly improved by virtue of the shadow mapping, namely shader capacity, of GPU, and by virtue of the calculation capacity of the GPU.

Description

technical field [0001] The invention relates to the field of computer graphics, in particular to a multi-light source rendering method based on a virtual spherical light source. Background technique [0002] Computing global illumination effects in complex scenes with multiple glossy surfaces is a long-standing unsolved problem in rendering research. A common solution is to transform the panoramic lighting problem into a multi-light source lighting problem. The multi-light source-based rendering algorithm generates a large number of virtual point light sources (VPL) to fit indirect lighting and the shadow surfaces corresponding to these light sources. In global illumination path space mode, these methods create a photon path of arbitrary length for a virtual point light source and a camera subpath of corresponding length for visible surface samples. [0003] Computing the connection of the camera to the photon path is what differentiates the multi-light source method from o...

Claims

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Application Information

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IPC IPC(8): G06T15/50G06T15/55G06T15/60
Inventor 张根源
Owner ZHEJIANG UNIVERSITY OF MEDIA AND COMMUNICATIONS
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