Interactive Ray Tracing of Distance Fields Ondřej Jamriška

Interactive Ray Tracing of Distance Fields Ondřej Jamriška
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发表时间:
2010
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通讯作者:
V. Havran
V. Havran
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其他
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作者:
V. Havran

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距离场是一种柔性曲面表示法,在许多应用中都有应用。我们研究了在交互帧率下通过光线追踪直接绘制距离场表面表示的算法。为了加速光线追踪,我们采用稀疏块网格数据结构来表示距离场。比较了不同的射线-曲面相交检验方法和曲面法向估计方法的视觉质量和计算时间。提出了一种用投影法加速相机一次射线计算的方法。我们还描述了另一种通过体积遮挡更快计算阴影光线的技术。我们在四个不同复杂性的场景中展示了结果。
Distance field is a flexible surface representation used in many applications. We study the algorithms for direct rendering of distance field surfaces representation via ray tracing in interactive frame rates. To accelerate the ray tracing we represent the distance fields by sparse block grid data structure. We compare the visual quality and the computation time for different methods of ray-surface intersection test and for surface normal estimation. We present a technique to accelerate the computation for primary rays from camera by projection. We also describe another technique for faster computation of shadow rays via volumetric occlusion. We show the results on four scenes of different complexities.