VISUS, Universität Stuttgart, Stuttgart, Germany.
IEEE Trans Vis Comput Graph. 2010 Nov-Dec;16(6):1505-14. doi: 10.1109/TVCG.2010.145.
We extend direct volume rendering with a unified model for generalized isosurfaces, also called interval volumes, allowing a wider spectrum of visual classification. We generalize the concept of scale-invariant opacity—typical for isosurface rendering—to semi-transparent interval volumes. Scale-invariant rendering is independent of physical space dimensions and therefore directly facilitates the analysis of data characteristics. Our model represents sharp isosurfaces as limits of interval volumes and combines them with features of direct volume rendering. Our objective is accurate rendering, guaranteeing that all isosurfaces and interval volumes are visualized in a crack-free way with correct spatial ordering. We achieve simultaneous direct and interval volume rendering by extending preintegration and explicit peak finding with data-driven splitting of ray integration and hybrid computation in physical and data domains. Our algorithm is suitable for efficient parallel processing for interactive applications as demonstrated by our CUDA implementation.
我们通过统一的广义等位面（也称为区间体）模型扩展了直接体绘制，从而允许更广泛的视觉分类。我们将比例不变的不透明度（典型的等位面渲染）的概念推广到半透明的区间体。比例不变的渲染与物理空间维度无关，因此可以直接促进数据分析的特点。我们的模型将尖锐的等位面表示为区间体的极限，并将它们与直接体绘制的特征相结合。我们的目标是进行精确的渲染，以保证所有的等位面和区间体都以无裂缝的方式可视化，并且具有正确的空间顺序。我们通过扩展预积分和显式峰值查找，结合数据驱动的光线积分分割和物理域和数据域的混合计算，实现了直接体和区间体的同时绘制。我们的算法适合于交互式应用程序的高效并行处理，这一点通过我们的 CUDA 实现得到了证明。
