Raytracer 通过追踪从摄像机到光源的路径而清晰真实地展示了图像，但需要很长时间。
Raytracers render phenomenally realistic images by following the path from the camera to a light source -- and they need a phenomenally long time to do so.
增加了圆柱体光和真实面光源以满足大众的需要。
By popular demand, the Cylinder light, a true area light source is now included.
也可以测量光源的偏振态，结果可用于模拟。你可以得到更真实的模拟结果。
The polarization state of Light source also can be measured. So we can use the data for simulation. Then you can get more real simulation results.
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