Three-dimensional volume cloud rendering method and system based on three-dimensional noise map

Abstract

The invention provides a three-dimensional volume cloud rendering method and system based on a three-dimensional noise map, and the method comprises the steps: S1, constructing a three-dimensional noise texture space, and constructing a three-dimensional volume cloud in the three-dimensional noise texture space; s2, constructing a real three-dimensional space, and mapping the three-dimensional volume cloud to the real three-dimensional space; s3, obtaining the sight line direction of the pixel points, determining the overall density of the three-dimensional volume cloud in the sight line direction, and determining the transparency of the pixel point rendering cloud based on the overall density; and S4, obtaining the position, the illumination intensity and the preset color of the sun, anddetermining the color of the pixel point rendering cloud in combination with the overall density and the sight line direction. According to the three-dimensional volume cloud rendering method based onthe three-dimensional noise map, only two groups of three-dimensional noise texture maps are needed, the storage space is reduced, layer clouds, accumulated clouds and layer accumulated clouds can berendered, and the real lighting effect of the clouds is displayed after rendering.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a three-dimensional volumetric cloud rendering method and system based on a three-dimensional noise map. Background technique [0002] In computer-rendered virtual scenes (especially development-style scenes), the rendering of rich and realistic 3D clouds can greatly improve the realism of the scene. For example, huge dark clouds will make people daunting, dense fog will make people depressed, and sunset Lit clouds create a sense of wonder. [0003] For cloud rendering, the common implementation method is based on the cloud image library, which is simple to implement, but has many shortcomings. If only one image is stored for a certain form of cloud at a certain angle, when the viewpoint moves, the cloud that looks good at rest in the sky will tear apart and disappear, and the farther you move, the more obvious it will be. This problem can be solved by storing ...

AI Technical Summary

Problems solved by technology

This problem can be solved by storing multiple images from different angles and rendering different images as the viewpoint moves, however, since multiple images (usually high-resolution images) must be stored, image textures will take up a lot of storage space , the higher the degree of detail of the cloud, the larger the storage space

Moreover, this implementation method can generally only render low-altitude stratus clouds, and basically cannot achieve very thick columnar stratocumulus or high-altitude cumulus clouds, and the real lighting effect of clouds is also very unreal.

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