Real-time indirect gloss reflection rendering method for linear transformation spherical distribution

Abstract

The invention belongs to the field of real-time rendering, and discloses a real-time indirect gloss reflection rendering method for linear transformation spherical distribution, which comprises the following steps of: determining a virtual point light source generation algorithm and improving the virtual point light source generation algorithm; determining the radius of a virtual point light source by defining an importance factor, and randomly rejecting the virtual point light source according to a Russian roulette method; in a global illumination rendering pipeline based on an immediate radiance algorithm, a mathematical thought of linear transformation spherical distribution is adopted, and complex spherical distribution in illumination calculation is linearly transformed into cosine distribution for calculation; a global illumination calculation formula is improved, and a linear transformation matrix and a specific coloring point are decoupled. The method is stable in rendering efficiency, low in system overhead and low in rendering error.

Description

technical field [0001] The invention belongs to the field of real-time rendering, in particular to a real-time indirect gloss reflection rendering method for linearly transforming spherical distribution. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] The indirect glossy reflection effect is one of the common lighting effects in daily life. The simulation of the indirect glossy reflection effect has extremely important value and research significance in the fields of games, film and television animation, virtual reality, visual simulation, etc. Indirect glossy Reflection effects can greatly enhance the realism of rendered images and are a vital part of the field of graphics rendering. In the field of real-time rendering, the immediate radiosity algorithm is one of the algorithms used to simulate the effect of indirect glossy reflections in real time. In this algorithm, in order to calculate the glos...

AI Technical Summary

Problems solved by technology

[0006] (1) The virtual point light source generated based on the shadow map cannot be reused in the multi-light source scene and the virtual point light source generated based on the triangular mesh may have the problem of result deviation due to factors such as mesh shape and size;

[0007] (2) Randomly cropping the virtual point light source may calculate many virtual point light sources that have little influence on the shading point;

[0008] (3) GGX BRDF lighting model to render the high overhead caused by indirect glossy reflection effects;

Due to the existence of texture sampling operations, different virtual point sources have different matrix texture sampling coordinates, resulting in too many texture sampling times, which will greatly reduce rendering efficiency

Therefore, it cannot be directly applied to the calculation of indirect glossy reflection effects, otherwise there will be a large number of texture sampling operations, which will seriously affect the efficiency

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