Woodring Jonathan, Shen Han-Wei
Department of Computer Science and Engineering, Ohio State University, USA.
IEEE Trans Vis Comput Graph. 2006 Sep-Oct;12(5):909-16. doi: 10.1109/TVCG.2006.164.
Time-varying, multi-variate, and comparative data sets are not easily visualized due to the amount of data that is presented to the user at once. By combining several volumes together with different operators into one visualized volume, the user is able to compare values from different data sets in space over time, run, or field without having to mentally switch between different renderings of individual data sets. In this paper, we propose using a volume shader where the user is given the ability to easily select and operate on many data volumes to create comparison relationships. The user specifies an expression with set and numerical operations and her data to see relationships between data fields. Furthermore, we render the contextual information of the volume shader by converting it to a volume tree. We visualize the different levels and nodes of the volume tree so that the user can see the results of suboperations. This gives the user a deeper understanding of the final visualization, by seeing how the parts of the whole are operationally constructed.
由于一次性呈现给用户的数据量较大，时变、多变量和比较数据集不易可视化。通过将多个体数据与不同运算符组合成一个可视化体数据，用户能够在空间、时间、运行或场中比较来自不同数据集的值，而无需在各个数据集的不同渲染之间进行思维切换。在本文中，我们建议使用一种体着色器，用户可以轻松选择并操作多个数据体以创建比较关系。用户通过设置表达式并进行数值运算以及输入数据来查看数据字段之间的关系。此外，我们通过将体着色器转换为体树来渲染其上下文信息。我们可视化体树的不同级别和节点，以便用户能够看到子操作的结果。通过查看整体的各个部分是如何通过操作构建而成的，这能让用户对最终的可视化有更深入的理解。
