相比于传统的二维视频，三维视频能提供所观察物体的深度信息，从而使用户产生立体视觉的体验，某些三维技术允许用户在欣赏节目时自由的选择视点，切换视角。
Compared with traditional two dimension video, the new 3DV can provide the users with the depth information of the object, which can lead user to a stereo world.
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.
并为用户提供了方便的多视点的观察选择，满足了用户对不同角度和方式下的虚拟现实视景漫游要求。
The convenient multi-viewpoints observation choice is provided in the system for the user, thus the requirement of roaming virtual reality scene to the different Angle and way is satisfied.
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