光线投影算法将光线穿过数据场中的体元，采样得到相关象素的颜色， 形成可视图。
Ray-casting algorithm is that ray passes volume cell of data field, sampling relative pels color to form video image.
它不是常见的投影图像，而是一种新的投射光线到所需位置的方法。
This does not involve holographic images of the usual sort, but is a way of projecting beams of light wherever they are needed.
虽然阳光呈直线照射，但光线在球型天空的投影却是巨大的圆形。
Now although sunlight indeed travels along straight lines, the projections of these lines onto the spherical sky are great circles.
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