时变间隔体积

Caixia Zhang, Daqing Xue, R. Crawfis, R. Wenger
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引用次数: 6

摘要

本文研究时变体积数据的区间分割和直接绘制,为时变结构化和非结构化网格提供更有效的交互式体绘制。我们的分割是基于时间步之间的标量域内的间隔,产生一组几何定义的时变间隔体积。为了构造时变区间体积,我们将问题提高了一个维度,使用五维等高结构进行交互计算或分割。本文的重点是如何直接呈现时变区间体积。我们通过将四维简单体投影到3D上,将投影的4-简单体分解为3-简单体,然后使用改进的硬件实现投影四面体方法进行渲染,从而直接渲染四维区间体。通过这种方式,我们可以在一个视图中看到间隔体积是如何随时间变化的。该算法不依赖于构成网格的多面体单元的拓扑结构,从而对时变非结构化网格的体绘制提供了很好的增强。该算法的另一个优点是可以将不同的体积和表面边界嵌入到时变区间体积中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Time-varying interval volumes
In this paper, we study the interval segmentation and direct rendering of time-varying volumetric data to provide a more effective and interactive volume rendering of time-varying structured and unstructured grids. Our segmentation is based upon intervals within the scalar field between time steps, producing a set of geometrically defined time-varying interval volumes. To construct the time-varying interval volumes, we cast the problem one dimension higher, using a five-dimensional isocontour construction for interactive computation or segmentation. The key point of this paper is how to render the time-varying interval volumes directly. We directly render the 4D interval volumes by projecting the 4D simplices onto 3D, decomposing the projected 4-simplices to 3-simplices and then rendering them using a modified hardware-implemented projected tetrahedron method. In this way, we can see how interval volumes change with the time in one view. The algorithm is independent of the topology of the polyhedral cells comprising the grid, and thus offers an excellent enhancement to the volume rendering of time-varying unstructured grids. Another advantage of this algorithm is that various volumetric and surface boundaries can be embedded into the time-varying interval volumes.
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