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.

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本文根据芦苇在不同湿地生境的分布，合理选择采样点，做实验室模拟实验。

The thesis chooses the reasonable sampling site according to the different distribution of Phragmite australis, and combing the simulation experiment.

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然后对人脸不同局部位置处采样点的分类能力进行评价，选择分类能力最强的位置提取特征点。

Then, the classification abilities of different local positions in the face were evaluated, and feature points were chosen at the positions with the strongest discriminating power.

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