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 共查询到10条相似文献,搜索用时 140 毫秒
1.
OpenGL中基于粒子系统的喷泉模拟实现   总被引:1,自引:1,他引:1  
肖何  何明耘  白忠建 《计算机仿真》2007,24(12):201-204
喷泉效果可以大大增强虚拟现实系统的沉浸感,对喷泉的模拟在视景仿真系统、计算机游戏、三维动画中有着广泛的运用.粒子系统是模拟喷泉的一种有效方法.目前一些喷泉模拟方法中存在算法复杂、粒子数量巨大、计算耗时、图像不真实等问题.文中提出了一种基于等加速运动和色彩融合的喷泉模拟方法.基本思想是在运用物理学原理模拟实现喷泉粒子的运动轨迹时,结合等加速运动来简化粒子运动状态,并采用纹理色彩融合绘制粒子.最后,运用VC 6.0和OpenGL开发工具实现了喷泉特效的模拟.实验证明该算法实现简单,模拟的喷泉效果满足实时性和逼真性的要求.  相似文献   

2.
基于硬件加速和粒子系统的实时喷泉模拟   总被引:6,自引:0,他引:6  
喷泉效果可以增强三维场景的真实感。论文用粒子系统作为喷泉建模的方法,通过动力学原理模拟水流的运动,对水流中粒子的运动采用循环式的重复使用,从而大大提高程序运行效率。利用Direct3D对粒子绘制的支持,通过Shader编程充分挖掘GPU的处理能力,并对水珠粒子进行多样化的高效绘制。通过CPU与GPU相互结合的方式,既保证了喷泉效果的真实感,又有较高的运行效率,也能满足系统实时性的速度需求。  相似文献   

3.
在分析现有喷泉模拟的基础上,针对喷泉造型的研究相对较少的问题,进行了喷泉造型设计并建模。运用多种数学曲线、曲面方程建立了复杂特殊的喷泉造型模型,并分析喷泉粒子的运动特性建立了喷泉运动模型。采用Visual Studio为编程工具,结合OpenGL技术渲染场景,在Windows XP环境下开发了基于粒子系统的喷泉模拟系统,仿真效果真实。  相似文献   

4.
针对传统的粒子系统实时仿真存在只能针对单一自然景物模拟、计算耗时、图像不真实、算法复杂等问题,提出了一种基于粒子系统和图形处理器(GPU)加速通用可扩展的自然景物模拟算法。在该算法中,粒子的物理运动计算过程和渲染阶段完全由CPU转移至GPU,可以增加粒子数量和提高渲染速度;同时,在渲染过程中,可以较好地利用硬件支持的粒子图技术来改善渲染中粒子的外表,选择不同纹理,从而能够较方便地模拟不同的自然景物。最后,在GPU上实现了雪花、喷泉、烟花、瀑布等模拟,算法充分利用了GPU的多通道并行处理性和可编程性,提高了自然景物模拟的实时性,可运用于虚拟现实系统。  相似文献   

5.
A Lagrangian particle model for multiphase multicomponent fluid flow, based on smoothed particle hydrodynamics (SPH), was developed and used to simulate the flow of an emulsion consisting of bubbles of a non-wetting liquid surrounded by a wetting liquid. In SPH simulations, fluids are represented by sets of particles that are used as discretization points to solve the Navier-Stokes fluid dynamics equations. In the multiphase multicomponent SPH model, a modified van der Waals equation of state is used to close the system of flow equations. The combination of the momentum conservation equation with the van der Waals equation of state results in a particle equation of motion in which the total force acting on each particle consists of many-body repulsive and viscous forces, two-body (particle-particle) attractive forces, and body forces such as gravitational forces. Similar to molecular dynamics, for a given fluid component the combination of repulsive and attractive forces causes phase separation. The surface tension at liquid-liquid interfaces is imposed through component dependent attractive forces. The wetting behavior of the fluids is controlled by phase dependent attractive interactions between the fluid particles and stationary particles that represent the solid phase. The dynamics of fluids away from the interface is governed by purely hydrodynamic forces. Comparison with analytical solutions for static conditions and relatively simple flows demonstrates the accuracy of the SPH model.  相似文献   

6.
We study the rotational dynamics of magnetic prolate elliptical particles in a simple shear flow subjected to a uniform magnetic field, using direct numerical simulations based on the finite element method. Focusing on paramagnetic and ferromagnetic particles, we investigate the effects of the magnetic field strength and direction on their rotational dynamics. In the weak field regime (below a critical field strength), the particles are able to perform complete rotations, and the symmetry property of particle rotational speed is influenced by the direction and strength of the magnetic field. In the strong field regime (above a critical strength), the particles are pinned at steady angles. The steady angle depends on both the direction and strength of the magnetic field. Our results show that paramagnetic and ferromagnetic particles exhibit markedly different rotational dynamics in a uniform magnetic field. The numerical findings are in good agreement with theoretical prediction. Our numerical investigation further reveals drastically different lateral migration behaviors of paramagnetic and ferromagnetic particles in a wall-bounded simple shear flow under a uniform magnetic field. These two kinds of particles can thus be separated by combining a shear flow and a uniform magnetic field. We also study the lateral migration of paramagnetic and ferromagnetic particles in a pressure-driven flow (a more practical flow configuration in microfluidics), and observe similar lateral migration behaviors. These findings demonstrate a simple but useful way to manipulate non-spherical microparticles in microfluidic devices.  相似文献   

7.
We present a visualization technique for simulated fluid dynamics data that visualizes the gradient of the velocity field in an intuitive way. Our work is inspired by rheoscopic particles, which are small, flat particles that, when suspended in fluid, align themselves with the shear of the flow. We adopt the physical principles of real rheoscopic particles and apply them, in model form, to 3D velocity fields. By simulating the behavior and reflectance of these particles, we are able to render 3D simulations in a way that gives insight into the dynamics of the system. The results can be rendered in real time, allowing the user to inspect the simulation from all perspectives. We achieve this by a combination of precomputations and fast ray tracing on the GPU. We demonstrate our method on several different simulations, showing their complex dynamics in the process.  相似文献   

8.
基于物理模型的实时卡通烟雾模拟算法   总被引:3,自引:0,他引:3       下载免费PDF全文
提出一种流体力学模型结合粒子系统的卡通烟雾实时模拟算法。通过Navier-Stokes方程建立烟雾流体场的物理模型,以保证运动轨迹真实感。为粒子属性引入浓度函数和作用半径,从而只需少量粒子就可快速获得浓度场分布。为了实现卡通化效果,使用代表动画师个人风格的卡通图元在不同浓度区域进行纹理贴图。试验结果证明,该算法高效快速,能实时生成自然生动的卡通烟雾效果。  相似文献   

9.
基于粒子系统的实时雨模拟   总被引:10,自引:0,他引:10       下载免费PDF全文
李苏军  吴玲达 《计算机工程》2007,33(18):236-238
基于流体动力学和粒子系统理论,给出了一种实时生成三维雨的方法。算法以矩形基本粒子对雨粒子进行造型,采用动态纹理映射技术和透明度扰动方法,根据雨滴的降落运动方程,来描述不同大小雨粒子受到重力和空气浮力、阻力影响时的运动效果,采用与视点相关技术动态生成三维降雨场景。与传统的雨模拟算法相比,该算法既正确模拟了雨的运动行为,又降低了计算复杂性,真实再现了雨的三维视觉效果,在满足实时交互漫游的前提下表现出较强的真实感,具有一定的实用价值。  相似文献   

10.
A numerical method of particles based on approximation of the system of gas dynamics equations in a form of nonlinear wave equations (NWE) of the second order in time and space variables is formulated. Based on the NWE, it is possible to construct the finite-difference and finite-element schemes with balance cells both as finite volumes and as Lagrange particles. The study of the method of particles and the numerical computation are performed for two-dimensional problems of gas dynamics in Lagrange variables on triangular grids.  相似文献   

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