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首页> 外文期刊>IEEE transactions on visualization and computer graphics >Scalable Hybrid Unstructured and Structured Grid Raycasting
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Scalable Hybrid Unstructured and Structured Grid Raycasting

机译：可扩展的混合非结构化和结构化网格光线投射

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This paper presents a scalable framework for real-time raycasting of large unstructured volumes that employs a hybrid bricking approach. It adaptively combines original unstructured bricks in important (focus) regions, with structured bricks that are resampled on demand in less important (context) regions. The basis of this focus+context approach is interactive specification of a scalar degree of interest (DOI) function. Thus, rendering always considers two volumes simultaneously: a scalar data volume, and the current DOI volume. The crucial problem of visibility sorting is solved by raycasting individual bricks and compositing in visibility order from front to back. In order to minimize visual errors at the grid boundary, it is always rendered accurately, even for resampled bricks. A variety of different rendering modes can be combined, including contour enhancement. A very important property of our approach is that it supports a variety of cell types natively, i.e., it is not constrained to tetrahedral grids, even when interpolation within cells is used. Moreover, our framework can handle multi-variate data, e.g., multiple scalar channels such as temperature or pressure, as well as time-dependent data. The combination of unstructured and structured bricks with different quality characteristics such as the type of interpolation or resampling resolution in conjunction with custom texture memory management yields a very scalable system.
机译：本文提出了一种可扩展的框架，该框架使用混合砌块方法对大型非结构化卷进行实时射线广播。它自适应地将重要（重点）区域中的原始非结构化砖与不重要（上下文）区域中按需重新采样的结构化砖结合起来。此焦点+上下文方法的基础是标量感兴趣程度（DOI）函数的交互式规范。因此，渲染始终同时考虑两个体积：标量数据体积和当前DOI体积。可见性排序的关键问题是通过射线投射各个砖块并按从前到后的可见性顺序进行合成来解决的。为了最大程度地减小网格边界处的视觉误差，即使对于重采样的砖块，也始终要准确地渲染它。可以组合各种不同的渲染模式，包括轮廓增强。我们方法的一个非常重要的特性是，它固有地支持多种单元类型，即即使使用单元内插值，它也不限于四面体网格。而且，我们的框架可以处理多变量数据，例如，多个标量通道，例如温度或压力，以及与时间有关的数据。具有不同质量特征（例如插值或重采样分辨率的类型）的非结构化砖和结构化砖的结合，以及自定义纹理内存管理，可产生非常可扩展的系统。

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