Research On Modeling And Rendering For Numerical 3D Cloud

As an important part of natural scenery,cloud simulation is a hot topic in computer graphics and meteorology today.The simulation of the cloud plays an important role in the construction of the real scene or in the animation of the film and television.Adding the simulated cloud image to the simulated scene can effectively improve the visual effect and increase the realism of the virtual environment.In addition,the three-dimensional cloud simulated by real meteorological data has rich meteorological information,which can assist meteorologists to observe the change of weather more conveniently and intuitively,and has a vital influence in the fields of artificial intervention in weather and weather forecasting.At present,cloud simulation technology based on meteorological data has been widely carried out in meteorological departments and even national defense fields in the world.Its technological achievements play an important role in human production and life,social and economic development,and meteorological weapons and meteorological weapons.Based on real meteorological data,this paper proposes a new cloud modeling method for particle system modeling slowness and slow collision detection speed,which shortens the drawing without guaranteeing the rendering effect.Time,and proposed a new neighborhood analysis algorithm to accelerate ray tracing and reduce the computational complexity in the cloud simulation process.The research in this paper mainly includes two aspects:(1)In the modeling method of cloud,the computational complexity of collision detection in particle system is high and the rendering efficiency is slow.It is proposed to divide the simulation scene into several regions by using binary spatial partition tree,which accelerates the collision detection efficiency of cloud particles and other objects.At the same time,the particles with approximate properties are clustered into clusters,and the particle cluster tree is constructed to avoid collision detection for all particles,which reduces the calculation amount to some extent.At the same time,texture texture technology is used to process the details of the particles.Then use the multiple forward scatter illumination model to render the particles,simulate the effect of light on the color and shadow of the cloud particles,and finally draw a realistic cloud image.(2)In the realistic rendering of the cloud,the traditional ray tracing algorithm is complex,the drawing time is long,and the computational complexity of the intersection process is large.An acceleration algorithm based on octree neighborhood analysis ray tracing is proposed.The method improves the data storage mode through the octree structure,reduces the complexity of data storage,and uses the neighborhood analysis algorithm to speed up the intersection of light and object,avoiding most of the recursive operations and improving the drawing efficiency;It simplifies the calculation of the refracted ray in the Whitted illumination model and reduces the calculation time.Finally,Vapor and OpenGL are used to realize the 3D visualization of meteorological cloud data.