Global Illumination Rendering Method Based on Virtual Light Source and Adaptive Sparse Matrix Restoration

Abstract

Provided is a global illumination rendering method on the basis of a virtual light source and an adaptive sparse matrix reduction, comprising: determining a visual sampler, a virtual light source and light source information of each virtual light source of a scene to be drawn; the visual sampler including a rendering point of a camera on a geometric grid surface of the scene to be drawn, and a line of sight in a medium of the scene to be drawn; the virtual light source including a virtual point light source and a virtual line light source; constructing a light transmission matrix for the scene to be drawn, establishing a corresponding light tree according to the light source information of the virtual light source, and sparse matrix reducing the light transmission matrix column-by-column according to the light tree; conducting a weighted summation of pixel brightness values of each visual sampler corresponding to each pixel, the result of the weighted summation being used as the brightness value of the pixel.

Description

technical field [0001] The invention relates to the field of image technology, in particular to a global illumination rendering method based on virtual light source and adaptive sparse matrix restoration. Background technique [0002] Global illumination is a very important research field in computer graphics. By simulating the lighting conditions in nature, it captures the soft shadows, indirect refraction and other lighting effects produced by the multiple propagation, refraction and reflection of light in the real environment. Effects can greatly enhance the realism of the rendering. This technique is often used in the rendering of movies, animations, and 3D models. There are various implementations of global illumination such as radiosity, ray tracing, ambient occlusion, photon maps. [0003] The method of a large number of light sources (Many-light) is one of the important global illumination technologies, which generates a large number of virtual light sources in the...

AI Technical Summary

Problems solved by technology

However, the light sectioning method still requires a lot of calculations. On average, each viewing angle sampling point needs to calculate the contribution of hundreds to thousands of virtual light sources to it, which seriously restricts the rendering speed and poor real-time performance.

Therefore, it can be seen that efficiency is still the main bottleneck restricting its application development.

[0007] In response to this problem, Chinese patent applications with publication numbers CN103971397A and CN105335995A disclose a multi-light rendering method based on light cutting technology, which uses a global sparse matrix restoration method to speed up multi-light rendering and improve light rendering efficiency. , due to the limitation of light cutting technology, this rendering method can only be applied to scenes without media

Images