【SIGGRAPH Asia 2012专题*技术论文】图形绘制：高品质的曲线渲染线采样能见度

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【SIGGRAPH Asia 2012专题*技术论文】
图形绘制：高品质的曲线渲染线采样能见度High-Quality Curve Rendering using Line Sampled Visibility
Rasmus Barringer, Carl Johan Gribel, Tomas Akenine-Möller 摘要：计算准确的能见度为基元，如毛发，毛皮，草，在所有尺度上的准确能见度仍然困难或昂贵。为此，我们提出了一个有效的能见度空间线采样算法的基础上，和一个新的十字路口之间线的样品飞机和B'ezier的的花键不同厚度的算法。我们的算法产生准确的可视性时的曲线的投影宽度的像素的一小部分，并且当投影宽度是几十像素。此外，我们提出了一个快速决心的过程，计算最终的能见度。Abstract：Computing accurate visibility for thin primitives, such as hair strands, fur, grass, at all scales remains difficult or expensive. To that end, we present an efficient visibility algorithm based on spatial line sampling, and a novel intersection algorithm between line sample planes and B´ezier splines with varying thickness. Our algorithm produces accurate visibility both when the projected width of the curve is a tiny fraction of a pixel, and when the projected width is tens of pixels. In addition, we present a rapid resolve procedure that computes final visibility.
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