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Fourth International Workshop on Volume Graphics, 2005.最新文献

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Accelerated, high-quality refraction computations for volume graphics 加速,高质量的折射计算体积图形
Pub Date : 2005-06-20 DOI: 10.2312/VG/VG05/073-081
Shengying Li, K. Mueller
We present an efficient framework for the high-quality rendering of discretely sampled surface-based objects with refractive effects. This requires an accurate estimation of the refraction coefficients, paired with efficient and accurate surface detection, space traversal, and backdrop image sampling. Our framework achieves these goals, by employing a high-quality spline-based filter in conjunction with a novel filtered octree space decomposition with pre-classified cells that is carefully matched to the filter and voxel neighborhood characteristics. Here, we benefit greatly from the non-negativity of the B-spline kernel. Finally, we describe an innovative scheme that achieves the high quality of pixel super-sampling on a flat backdrop plane without the overhead of tracing the actual rays across the refractive object.
我们提出了一个有效的框架,用于具有折射效应的离散采样表面物体的高质量渲染。这需要精确估计折射系数,配合高效准确的表面检测、空间遍历和背景图像采样。我们的框架实现了这些目标,通过采用高质量的基于样条的滤波器,结合一种新的滤波八叉树空间分解,其中预分类的单元与滤波器和体素邻域特征相匹配。在这里,我们从b样条核的非负性中获益良多。最后,我们描述了一种创新的方案,该方案在平坦背景平面上实现了高质量的像素超采样,而无需跟踪穿过折射物体的实际光线。
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引用次数: 19
Introducing topological attributes for objective-based visualization of simulated datasets 引入基于目标的仿真数据集可视化拓扑属性
Pub Date : 2005-06-20 DOI: 10.2312/VG/VG05/137-145
Yuriko Takeshima, Shigeo Takahashi, I. Fujishiro, G. Nielson
Recent development in the design of multi-dimensional transfer functions allows us to automatically generate comprehensible visualization images of given volumes by taking into account local features such as differentials and curvatures. However, especially when visualizing volumes obtained by scientific simulations, observers usually exploit their knowledge about the simulation settings as the clues to the effective control of visualization parameters for their own specific purposes. This paper therefore presents an objective-based framework for visualizing simulated volume datasets by introducing a new set of topological attributes. These topological attributes are calculated from the level-set graph of a given volume dataset, and thus differ from the conventional local attributes in that they also illuminate the global structure of the volume. The present framework provides a systematic means of emphasizing the underlying volume features, such as nested structures of isosurfaces, configuration of isosurface trajectories, and transitions of isosurface's topological type. Several combinations of the topological attributes together with the associated transfer function designs are devised and applied to real simulated datasets in order to demonstrate the feasibility of the present framework.
多维传递函数设计的最新发展使我们能够通过考虑微分和曲率等局部特征,自动生成给定体积的可理解的可视化图像。然而,特别是在通过科学模拟获得的可视化体时,观察者通常利用他们关于模拟设置的知识作为有效控制可视化参数的线索,以满足自己的特定目的。因此,本文提出了一个基于目标的框架,通过引入一组新的拓扑属性来可视化模拟体数据集。这些拓扑属性是从给定的卷数据集的水平集图中计算出来的,因此与传统的局部属性不同,它们也照亮了卷的全局结构。目前的框架提供了一种系统的方法来强调潜在的体积特征,如等面层的嵌套结构、等面层轨迹的配置以及等面层拓扑类型的转换。设计了拓扑属性的几种组合以及相关的传递函数设计,并将其应用于实际的模拟数据集,以证明该框架的可行性。
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引用次数: 39
Robust generation of signed distance fields from triangle meshes 从三角形网格稳健地生成符号距离域
Pub Date : 1900-01-01 DOI: 10.1109/vg.2005.194111
J. Baerentzen
A new method for robust generation of distance fields from triangle meshes is presented. Graphics hardware is used to accelerate a technique for generating layered depth images. From multiple layered depth images, a binary volume and a point representation are extracted. The point information is then used to convert the binary volume into a distance field. The method is robust and handles holes, spurious triangles and ambiguities. Moreover, the method lends itself to Boolean operations between solids. Since a point cloud as well as a signed distance is generated, it is possible to extract an iso-surface of the distance field and fit it to the point set. Using this method, one may recover sharp edge information. Examples are given where the method for generating distance fields coupled with mesh fitting is used to perform Boolean and morphological operations on triangle meshes.
提出了一种从三角形网格中鲁棒生成距离场的新方法。图形硬件用于加速生成分层深度图像的技术。从多层深度图像中提取二值体和点表示。然后使用点信息将二进制体转换为距离场。该方法鲁棒性好,可以处理孔洞、伪三角形和歧义。此外,该方法还适用于实体之间的布尔运算。由于生成了点云和带符号的距离,因此可以提取距离场的等值面并将其拟合到点集。使用这种方法,可以恢复尖锐的边缘信息。给出了用距离场生成方法结合网格拟合对三角形网格进行布尔运算和形态运算的实例。
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引用次数: 17
期刊
Fourth International Workshop on Volume Graphics, 2005.
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