Layer-based cloud representation and real-time drawing method for covering whole airspace

Abstract

The invention discloses a hierarchy-based cloud representation and real-time drawing method covering a whole airspace, which is characterized in that a corresponding hierarchy detail representation and drawing method is set according to different distances of cloud layers, wherein the LoD0-LoD3 algorithms are respectively used for drawing cloud layers in a first-level distance range to a fourth-level distance range, and wherein the LoD0 algorithm is a traditional drawing method; the LoD1 algorithm comprises the following steps: giving a particle radius R and a number m, and calculating a coordinate axis alignment bounding box of a LoD0 particle set; randomly generating a plurality of new particles with the radius of R in the bounding box, and if the coincidence volume of the new particles and the particles in the LoD0 particle set is smaller than a set value h, or the coincidence volume of the new particles and other new particles is larger than a set value H, discarding the new particles; and adjusting the set values h and H, and finally leaving m new particles, wherein the LoD2 algorithm is an improved particle cloud real-time rendering algorithm, and the LoD3 algorithm is an atomization drawing method with noise.

Description

technical field [0001] The invention belongs to the fields of computer graphic image technology, virtual reality technology and software technology, and relates to a layer-based cloud representation and real-time rendering method covering the whole airspace. Background technique [0002] A cloud is a weather phenomenon caused by the accumulation of tiny droplets in the atmosphere within a certain altitude range. Its optical properties are different from the surrounding atmosphere, so that it presents unique lighting characteristics. The cloud-related rendering work has formed a relatively complete system from theory to method, but in applications such as free viewpoints and flight simulation visual systems for super-large scenes, real-time rendering of large-scale clouds still faces challenges, and the main problems of traditional methods are reflected. A large amount of computing resource consumption destroys the high frame rate of the flight scene, and its limited coverage...

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Problems solved by technology

Although there are also some similar research work on exploring cloud level detail technology (Tang Kai, Kang Fengju, Chu Yanjun. Simulation method of cloud in Vega[J]. Journal of System Simulation, 2005(09):2051-2053+2069; Li Sheng, Xu Zehua, Wang Guoping. An Efficient Method for Drawing Particle Clouds in Flight Visual Simulation, 201610962466.9.), but these works cannot achieve the effect of drawing clouds without boundaries

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