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首页> 外文期刊>IEEE transactions on visualization and computer graphics >A high accuracy volume renderer for unstructured data
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A high accuracy volume renderer for unstructured data

机译：用于非结构化数据的高精度体积渲染器

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This paper describes a volume rendering system for unstructuredndata, especially finite element data, that creates images with very highnaccuracy. The system will currently handle meshes whose cells are eithernlinear or quadratic tetrahedra. Compromises or approximations are notnintroduced for the sake of efficiency. Whenever possible, exactnmathematical solutions for the radiance integrals involved and forninterpolation are used. The system will also handle meshes with mixedncell types: tetrahedra, bricks, prisms, wedges, and pyramids, but notnwith high accuracy. Accurate semi-transparent shaded isosurfaces may benembedded in the volume rendering. For very small cells, subpixelnaccumulation by splatting is used to avoid sampling error. A revision tonan existing accurate visibility ordering algorithm is described, whichnincludes a correction and a method for dramatically increasing itsnefficiency. Finally, hardware assisted projection and compositing arenextended from tetrahedra to arbitrary convex polyhedra
机译：本文介绍了一种用于非结构化dndata（尤其是有限元数据）的体绘制系统，该系统可创建具有很高准确性的图像。该系统当前将处理其单元为非线性或二次四面体的网格。为了效率，不引入折衷或近似。只要有可能，就对所涉及的辐射积分和内插法使用精确的纳米运动解。该系统还将处理具有混合单元格类型的网格：四面体，砖块，棱柱形，楔形和金字塔形，但精度不高。精确的半透明阴影等值面可能会被嵌入体积渲染中。对于非常小的单元格，通过喷溅进行亚像素累积可避免采样误差。描述了对现有精确可见性排序算法的修订版，其中包括一种校正方法和一种显着提高其效率的方法。最后，将硬件辅助的投影和合成从四面体扩展到任意凸多面体

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