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Unified Visualization of 4D Particle System and Scalar Fields by Extending Point-Based Rendering

通过扩展基于点的渲染实现 4D 粒子系统和标量场的统一可视化

基本信息

批准号：
15607008
负责人：
FUJISHIRO Issei
金额：
$ 2.24万
依托单位：
Tohoku University (2004)Ochanomizu University (2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Mathematical fluid modeling is generally divided into two major categories : Eulerian and Lagrangian. The former formulates the fluid behavior by defining related physical fields, whereas the latter regards the fluid as a set of particles to solve the multiple body problem. The two approaches are accompanied with different visualization schemes : that is surface rendering (Eulerian) and point-based rendering (Lagranian). Meanwhile, hybrid simulation has recently been exploited to couple these two approaches for describing complex phenomena arising in many science and engineering problems. Therefore, there is an urgent need to establish simultaneous rendering of continuous and discontinuous objects.Pfister et al. proposed in 2000, a novel modeling technique, called surfels (surface cells), which relies on a point-based approximation to render complex shape of rigid body surfaces. In this study, we have extended the concept to visualize scattered objects as well by adding such features a … More s the radius and opacity distribution to describe the disk of surfel primitives, to yield a unified framework for representing physical fields and particle system. Then a prototype rendering system has been implemented on a standard workstation, where all of the traditional techniques such as surface rendering, volume rendering and particle rendering can be executed, and its feasibility has been proven with application to the following two specific problems :(1)Stratum disposal dataset (data courtesy of Fuji Research Institute)A particle-based model was used to simulate how nuclear waste infiltrate into a porous media over the long term. By using our system, scattered distribution of 200,000 colloid surfels with a relatively small radius is superimposed naturally on overlapped surfels to visualize inner boundaries of the porous media.(2)Breaking wave dataset (data coutesy of S.Koshizuka, University of Tokyo)Breaking wave is still known as one of the challenging topics in the research on interactive image synthesis of natural phenomena. In our study, the dynamics of 2D breaking wave was modeled using the Moving Particle Semi-implicit method. Then, a quasi-3D dataset of breaking wave was generated with parallel interpolation and local particle generation. We took full advantage of extended surfel primitives with varying radius and Gaussian opacity distribution to visualize the components of breaking waves, namely swell and riffle as well as splash, in a consistent manner. Less

数学流体模型一般分为两大类：欧拉模型和拉格朗日模型。前者通过定义相关的物理场来描述流体的行为，而后者则将流体视为一组粒子来解决多体问题。这两种方法伴随着不同的可视化方案：即面绘制(Eulerian)和基于点的绘制(Lagranian)。同时，混合模拟最近被用来结合这两种方法来描述许多科学和工程问题中出现的复杂现象。因此，迫切需要建立连续和不连续对象的同时绘制。2000年提出了一种新的建模技术，称为曲面单元(Surfels)，它依赖于基于点的近似来渲染复杂形状的刚体曲面。在本研究中，我们通过在…中添加这样的特征，将这一概念扩展到对散乱目标的可视化S用更多的半径和不透明度分布来描述曲面的圆盘基元，给出了表示物理场和粒子系统的统一框架。然后在标准工作站上实现了一个原型渲染系统，该系统可以执行面绘制、体绘制和粒子绘制等所有传统技术，并通过对以下两个具体问题的应用验证了其可行性：(1)地层处理数据集(数据由富士研究所提供)一个基于粒子的模型被用来模拟核废物长期渗透到多孔介质中的过程。利用我们的系统，将20万个半径相对较小的胶体曲面的散布自然地叠加在重叠的曲面上，以可视化多孔介质的内部边界。(2)破碎波数据集(东京大学S.Koshizuka的Data Coutesy)破碎波仍然是自然现象交互图像合成研究中具有挑战性的课题之一。在我们的研究中，用移动质点半隐式方法模拟了二维破碎波的动力学。在此基础上，采用并行插值法和局部粒子生成法生成了准三维破碎波数据集。我们充分利用扩展的SURFEL基元的变化半径和高斯不透明度分布，以一致的方式可视化破碎波的分量，即涌浪、翻腾和飞溅。较少