The contradiction between the realistic and real-time of the shadow rendering algorithm has been a fundamental and difficult problem in computer graphics and virtual reality technology.

阴影绘制算法的真实感和实时性之间的矛盾，是计算机图形学和虚拟现实技术目前所要解决的一个基本难题。

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With the era of programmable graphics hardware, shader replaces the traditional fixed rendering pipeline to achieve more realistic effects.

随着可编程图形硬件时代的到来，着色器替代了传统的固定渲染管线以实现更加逼真的图像效果。

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All of the above set great demand for the development of computer graphics, image processing, virtual reality, computer vision and photo-realistic rendering.

所有的一切，都对计算机图形学、图像处理、虚拟现实、计算机视觉以及真实感绘制等相关学科提出了更高的要求。

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