Screen Space Anisotropic Blurred Soft Shadows by Efficient Separable Filtering Method
Screen Space Anisotropic Blurred Soft Shadows by Efficient Separable Filtering Method
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DOI：
10.1109/cw.2013.75
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发表时间：
2013-10
期刊：
影响因子：
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通讯作者：
Zhong Zheng;S. Saito
中科院分区：
文献类型：
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作者：
Zhong Zheng;S. Saito
阴影映射是真实的计算机图形学中生成阴影的一种有效方法，它具有从硬阴影合成到软阴影合成的广泛变化。基于阴影贴图的软阴影是一种在阴影贴图或屏幕空间上的模糊技术。屏幕空间上的模糊可以很容易地与延迟着色管道联合收割机相结合。然而，屏幕空间上的模糊有一个缺点：当视图方向与阴影平面的法线成大角度时，生成的阴影不正确。在本文中，我们介绍了一种新的基于屏幕空间的软阴影的方法，是更快，更准确地产生软阴影比以前的屏幕空间软阴影映射方法。得到的图像显示阴影通过我们的方法只是站在同一个地方，而阴影通过前面的方法在半影方面的变化，而视图移动。令人惊讶的是，虽然我们的方法比以前的方法更复杂，但计算时间的测量表明我们的方法也比以前的方法更快。这是因为我们的方法更准确地控制了模糊区域，从而成功地减少了模糊的乘法。
Shadow mapping is an efficient method to generate shadows in real time computer graphics and has broad variations from hard to soft shadow synthesis. Soft shadowing based on shadow mapping is a blurring technique on a shadow map or on screen space. Blurring on screen space can easily combine with a deferred shading pipeline. However, blurring on screen space has a drawback: the generated shadow is not correct when a view direction has a large angle to the normal of the shadowed plane. In this paper, we introduce a new screen space based method for soft shadowing that is faster and generates more accurate soft shadows than the previous screen space soft shadow mapping method. The resultant images show shadows by our method just stand in the same place, while shadows by the previous method change in terms of penumbra while the view moves. Surprisingly, although our method is more complex than the previous method, the measurement of the calculation time shows our method is also faster than the previous method. This is because our method controls the blurring area more accurately and thus successfully reduces multiplications for blurring.