Shadow map generation method and device

Abstract

The invention provides a shadow map generation method and device. The method comprises the following steps of: creating a texture map according to a preset shadow image number and a preset image size,and dividing the texture map into a plurality of texture regions with the same size; dividing a camera space under the current angle of view in parallel according to the preset shadow image number, and obtaining a view projection matrix, under the current light direction, corresponding to each divided view space on the basis of a light direction in the current game scene; carrying out rendering in corresponding texture regions to generate shadow depth images of objects projected into corresponding view spaces under the current light direction according to the view projection matrixes of the view spaces; and carrying out matrix transformation on each view projection matrix so as to obtain a transfer matrix and a texture coordinate range corresponding to each texture region. According to the method, different levels of shadow images in generated shadow maps can be sampled at the same time, so that the rendering efficiency and the level transition effect are improved.

Description

technical field [0001] The present invention relates to the technical field of game scene processing, in particular to a method and device for generating a shadow map. Background technique [0002] In order to simulate environmental changes as realistically as possible in 3D games, real-time shadow rendering is often required to improve game image quality. [0003] In the prior art, a commonly used real-time shadow rendering scheme is to generate multiple different shadow maps for objects in the game scene, and select different shadow maps for sampling rendering according to the depth value of the object during shadow rendering, so as to Achieve the effect of real-time shadow rendering. However, the shadow map generated by this scheme will make the shadow rendering efficiency not high, and the shadow maps of different levels cannot be sampled at the same time, and the level transition effect is poor for pixels between shadow maps of adjacent levels. Contents of the invent...

AI Technical Summary

Problems solved by technology

However, the shadow map generated by this scheme will make the shadow rendering efficiency not high, and the shadow maps of different levels cannot be sampled at the same time. For the pixels between the shadow maps of adjacent levels, the level transition effect is poor.

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