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Method for achieving real-time rendering of large-scale realistic volumetric cloud

A technology of rendering effects and cloud layers, which is used in the processing of 3D images, image data processing, instruments, etc.

Inactive Publication Date: 2014-11-12
HARBIN DIANSHI SIMULATION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention establishes a method for realizing real-time rendering of large-scale realistic volumetric clouds on a stream processor, and solves the challenging problem of complex lighting calculations in the simulation and rendering of clouds without well-defined boundaries. The large-scale realistic rendering of the present invention The method of volumetric cloud real-time rendering first uses a geometric model based on LOD technology to model the cloud, and uses 2D texture to control the shape of the cloud; secondly, it uses preprocessing to calculate the cloud's lighting, and establishes the cloud's multiple forward scattering and sky lighting. function, and store the calculation results in 3D textures, and finally use the GPU for real-time rendering of large-scale volumetric clouds, and simulate the cloud coverage in the sky, cloud density, wind and other factors

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  • Method for achieving real-time rendering of large-scale realistic volumetric cloud
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  • Method for achieving real-time rendering of large-scale realistic volumetric cloud

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Embodiment Construction

[0038] This embodiment combines figure 1 -6 The present invention is introduced in detail.

[0039] (1) First, establish a two-level LOD geometric model based on dynamic billboard (Billboard) technology, such as figure 1 shown. LOD 1 The multi-layer concentric circular grid model is used as the low-level LOD of the model. The number of grid layers is related to the thickness of the cloud layer, and has a direct impact on the rendering effect and rendering speed. The more layers, the better the final rendering effect. It also takes more time to render; fewer layers can improve rendering efficiency, but when viewed from a narrower angle, you will see gaps between layers. During the simulation process, trade-offs can be made according to specific situations. LOD 0 Using dynamic billboard technology, unlike the usual billboard around a fixed center of rotation and keeping the size of the billboard unchanged, the center of rotation of the dynamic billboard and the size of the ...

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Abstract

The invention discloses a method for achieving real-time rendering of large-scale realistic volumetric cloud on a stream processor. The method comprises the steps of establishing a novel grid model based on the Level of Detail (LOD) technology, forming 2D textures controlling the shape of the cloud, establishing a multiple forward scatter model of the cloud and carrying out illumination computation of the cloud. The method is characterized in that the reflection effect on the sky and the sun is achieved through the cubic textures, the illumination result obtained through precomputation is stored through 3D textures, and the illumination computation of the cloud is simplified; the factors such as the coverage rate of the cloud in the sky, the density of the cloud and wind are comprehensively considered. The method is particularly suitable for real-time rendering carried out when the cloud covers most or all of the sky, and has the advantages that the speed is high, the simulation degree is high and the platform compatibility is good.

Description

technical field [0001] The invention is related to computer graphics, and provides an important hardware platform for the development of graphics along with the rapid progress of the GPU technology of the stream computing platform. The invention relates to a real-time rendering method of a large-scale realistic volume cloud based on a stream computing platform GPU. Background technique [0002] The rendering technology of natural scenes has been continuously developed along with the development of computer graphics. Especially in recent years, with the rapid development of GPU programmable technology, GPU has been widely used in natural scene simulation, and a large number of research results have been obtained. Compared with the rendering of other natural scenes, due to the lack of well-defined boundaries of clouds and the complexity of simulation and lighting calculations, the real-time rendering of large-scale volumetric clouds is undoubtedly one of the challenging graphi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/00
Inventor 张泽旭王纲
Owner HARBIN DIANSHI SIMULATION SCI & TECH
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