Global illumination real-time rendering method based on radial basis function neural network fitting

Abstract

The present invention discloses a global illumination real-time rendering method based on radial basis function neural network fitting, and belongs to the field of realistic graphics real-time rendering. The method comprises training-data acquisition, neural network construction, neural network training, indirect illumination value fitting, direct illumination value computation and global illumination rendering. An offline rendering mode is used to perform pre-computation to obtain training data; a center of a radial basis function is determined by using a subtractive clustering method; a supervised learning method is used to perform training; and a nonlinear relationship between a viewpoint position, a light source position, an object surface normal vector in a scene and the like in indirect illumination and an indirect illumination value is fitted to replace a traditional global illumination model to complete indirect illumination computation, thereby avoiding a plurality of intersection of lights. According to the global illumination real-time rendering method based on radial basis function neural network fitting provided by the present invention, redundant data can be effectively reduced; convergence occurs at a higher speed; the offline rendering effect is well fit; and global illumination real-time rendering is completed.

Description

technical field [0001] The invention relates to a global illumination real-time rendering method based on radial basis function neural network fitting, and belongs to the technical field of realistic graphics real-time rendering. Background technique [0002] The rendering of realistic graphics mainly involves three aspects: scene geometry, object material and lighting model. The illumination model describes the relationship between the light source and the color of the surface being drawn, and can be divided into a local illumination model and a global illumination model. [0003] When the local illumination model is drawn, the color of the current drawn point is only affected by the light that directly illuminates the point, without considering the effect of light transmitted through other channels. [0004] In addition to the lighting directly from the light source, the global illumination model also needs to consider the lighting effects of the entire scene on the curre...

AI Technical Summary

Problems solved by technology

However, in the implementation process of these algorithms, they all encountered the situation that the light and the scene need to be intersected multiple times, which took a long time

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