Dynamic volume cloud construction and drawing method

A dynamic and volumetric technology, applied in the field of computer vision simulation, can solve problems such as the bottleneck of large-scale volumetric cloud rendering efficiency, and achieve the effect of accelerating light illumination calculation and rendering efficiency, overcoming sampling inaccuracy and overcoming inefficiency

Active Publication Date: 2017-04-19
北京大学(天津滨海)新一代信息技术研究院
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Problems solved by technology

[0004] However, there are still deficiencies in the efficiency of the rendering methods for 3D volumetric clouds in the prior art, especially when facing the application of flight scene simulation in flight simulators, how to construct and represent large-scale and large-area sky clouds, and overcome the The bottleneck of drawing efficiency of large-scale volumetric cloud is the problem to be solved in the present invention

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  • Dynamic volume cloud construction and drawing method
  • Dynamic volume cloud construction and drawing method

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Embodiment Construction

[0055] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0056] The construction and drawing process of dynamic volume cloud is as follows:

[0057] figure 1 Shows the construction and drawing process of volumetric cloud. The solid line in the figure represents the execution sequence of the process, while the dotted line represents the flow direction of data, the rectangular box represents a step in the process, and the oblique parallelogram represents the data generated or used. The process of the present invention is divided into two parts, the structure of the cloud layer and the drawing. The structure principle and process of the cloud layer are as follows: the three-dimensional cloud layer thickness field is generated based on Perlin noise, and then the density field is generated based on the thickness field, thus forming the d...

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Abstract

The invention provides a dynamic volume cloud construction and drawing method comprising the following steps that a cloud layer data field is constructed; and a cloud layer is drawn according to the cloud layer data field. A three-dimensional cloud layer thickness field is generated through superposition with Perlin noise acting as the basic noise, and then a density field is generated with the thickness field acting as the basis so that the shapes required by various three-dimensional volume clouds and dynamic changing clouds can be constructed, and the efficient cloud layer drawing effect can be acquired by an accelerated light depth and light illumination calculation method.

Description

technical field [0001] The invention relates to the technical field of computer visual simulation, in particular to the simulation of sky clouds and their dynamic effects, and in particular to a method for constructing and drawing dynamic volumetric clouds. Background technique [0002] Clouds are an important part of outdoor scenes. In most real-time rendering systems of small-scale 3D scenes or scenes whose viewpoint is near the ground, clouds are usually drawn using skybox textures. If the viewpoint is in the sky to watch the clouds at a close distance, or even enter the clouds, the result drawn by the skybox method cannot obtain enough realism. At this time, it is necessary to use a three-dimensional cloud drawing method to produce a more realistic three-dimensional effect of the cloud. special effects. [0003] For the representation and rendering of 3D clouds, literature (Harris MJ, Lastra A. Visualsimulation of clouds. Eurographics. 2001: 76-84) proposes to use dynam...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/50G06T15/00G06T17/05
CPCG06T15/005G06T15/506G06T17/05
Inventor 李胜徐泽骅汪国平
Owner 北京大学(天津滨海)新一代信息技术研究院
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