Controllable motion synthesis in a gaseous medium
Controllable motion synthesis in a gaseous medium
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DOI：
10.1007/s00371-005-0296-0
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发表时间：
2005-07
期刊：
影响因子：
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通讯作者：
Lin Shi;Yizhou Yu;C. Wojtan;Stephen Chenney
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文献类型：
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作者：
Lin Shi;Yizhou Yu;C. Wojtan;Stephen Chenney
生成满足用户自定义要求的逼真运动是计算机动画的重要目标之一。我们在这篇论文中的目标是在气体介质中合成真实的、可控的轻量级自然物体的运动。我们将该问题描述为一个以用户控制和流体运动方程为约束的大规模时空优化问题。我们设计了新颖而有效的方法来使这一大型优化易于处理。初始轨迹是基于风格运动规划的数据驱动合成生成的。光滑粒子流体动力学(SPH)在优化过程中被用来以合理的计算代价产生流体模拟，而有趣的基于涡旋的流体运动是通过记录初始轨迹中的涡旋的存在并通过优化来保持它们的。对象旋转作为后期处理进行了优化，以增强结果的视觉质量。我们在许多涉及单个或多个对象的动画上演示了我们的技术。
The generation of realistic motion satisfying user-defined requirements is one of the most important goals of computer animation. Our aim in this paper is the synthesis of realistic, controllable motion for lightweight natural objects in a gaseous medium. We formulate this problem as a large-scale spacetime optimization with user controls and fluid motion equations as constraints. We have devised novel and effective methods to make this large optimization tractable. Initial trajectories are generated with data-driven synthesis based on stylistic motion planning. Smoothed particle hydrodynamics (SPH) is used during optimization to produce fluid simulations at a reasonable computational cost, while interesting vortex-based fluid motion is generated by recording the presence of vortices in the initial trajectories and maintaining them through optimization. Object rotations are refined as a postprocess to enhance the visual quality of the results. We demonstrate our techniques on a number of animations involving single or multiple objects.