A model for volume lighting and modeling
A model for volume lighting and modeling
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DOI：
10.1109/tvcg.2003.1196003
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发表时间：
2003-04-01
影响因子：
5.2
通讯作者：
McPherson, A
中科院分区：
文献类型：
--
作者：
Kniss, J;Premoze, S;McPherson, A
直接体绘制是可视化应用中常用的技术。这些应用中的许多应用需要复杂的着色模型来捕捉微妙的照明效果以及体积数据和材料的特性。对于许多体积，均匀区域对典型的基于梯度的表面着色造成问题，许多常见的对象和自然现象表现出无法使用简单的照明模型捕获的视觉质量，或者无法使用更复杂的方法以交互速率解决。我们提出了一个简单而有效的交互式阴影模型，它捕获体积光衰减的影响，包括体积阴影，相位函数的近似，前向散射的近似，和色度衰减，提供了微妙的外观的不透明。我们还提出了一种体积位移或扰动技术，允许现实的交互式建模的高频细节为真实的和合成体数据。
Direct volume rendering is a commonly used technique in visualization applications. Many of these applications require sophisticated shading models to capture subtle lighting effects and characteristics of volumetric data and materials. For many volumes, homogeneous regions pose problems for typical gradient-based surface shading, Many common objects and natural phenomena exhibit visual quality that cannot be captured using simple lighting models or cannot be solved at interactive rates using more sophisticated methods. We present a simple yet effective interactive shading model which captures volumetric light attenuation effects that incorporates volumetric shadows, an approximation to phase functions, an approximation to forward scattering, and chromatic attenuation that provides the subtle appearance of translucency. We also present a technique for volume displacement or perturbation that allows realistic interactive modeling of high frequency detail for both real and synthetic volumetric data.