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

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...

AI Technical Summary

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 source scope needs to be limited

These methods provide good visual effects in diffuse scenes, but in scenes with high-gloss materials, multi-light source lighting methods using virtual point lights will cause the lack of lighting effects

[0005] Therefore, the distortion problem caused by the existing multi-light source method needs to be solved urgently

Images