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.
当我坐在与两个喇叭等距的“最佳点”时，整体效果会最好，但即使我转个头或左右晃动，也都无法打破这种错觉。
Although the sound was best when I was seated in the "sweet spot" between the speakers-equidistant from both - I could turn my head or move from side to side without destroying the illusion.
刀具中心点的轨迹就是等距形体的部分轮廓线。
The partial contour of the regenerated shape is just the path of the cutter center.
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