其光线投射算法从屏幕上的每个像素点出发，沿设定视点方向，发出一条射线，沿该射线选择若干个等距采样点。
Ray casting were stared out at every pixel on screen along viewpoint direction, and then some sample points were selected on the line.
要显示之前的图像，必须以较低的像素分辨率重新采样(调整大小)。
Before the image can be displayed, it must be downsampled (resized) to lower pixel resolution.
精巧的提升采样器(upsampler)，减少明显边缘的像素化(pixelation)现象。
A fancy upsampler which reduces the pixelation of strong edges.
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