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首页> 外文期刊>Computer Graphics Forum: Journal of the European Association for Computer Graphics >Unsteady Flow Visualization by Animating Evenly-Spaced Streamlines
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Unsteady Flow Visualization by Animating Evenly-Spaced Streamlines

机译：通过对均匀分布的流线进行动画处理来实现非恒定流可视化

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摘要

In recent years the work on vector field visualization has been concentrated on LIC-based methods. In this paper we propose an alternative solution for the visualization of unsteady flow fields. Our approach is based on the computation of temporal series of correlated images. While other methods are based on pathlines and try to correlate successive images at the pixel level, our approach consists in correlating instantaneous visualizations of the vector field at the streamline level. For each frame a feed forward algorithm computes a set of evenly-spaced streamlines as a function of the streamlines generated for the previous frame. This is achieved by establishing a correspondence between streamlines at successive time steps. A cyclical texture is mapped onto every streamline and textures of corresponding streamlines at different time steps are correlated together so that, during the animation, they move along the streamlines, giving the illusion that the flow is moving in the direction defined by the streamline. Our method gives full control on the image density so that we are able to produce smooth animations of arbitrary density, covering the field of representations from spares, that is classical streamline-based images, to dense, that is texture-like images.
机译：近年来，矢量场可视化的工作一直集中在基于LIC的方法上。在本文中，我们提出了一种非稳态流场可视化的替代解决方案。我们的方法基于相关图像的时间序列的计算。虽然其他方法都基于路径，并尝试在像素级别关联连续的图像，但我们的方法包括在流线级别关联矢量场的瞬时可视化。对于每个帧，前馈算法根据为前一帧生成的流线计算一组均匀间隔的流线。这是通过在连续的时间步长之间建立流线之间的对应关系来实现的。周期性纹理被映射到每个流线，并且在不同时间步长上相应流线的纹理关联在一起，因此，在动画过程中，它们沿着流线移动，从而产生了流向流线定义的方向移动的错觉。我们的方法可以完全控制图像的密度，因此我们能够生成任意密度的平滑动画，覆盖从备用图像（基于经典流线型图像）到密集图像（如纹理图像）的表示领域。

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