求解轨迹线集合所形成的外包多边形和内部顺时针环，得到的多边形即为临界多边形。
Get the enclosing polygon and internal clockwise loops that was formed by the track line segments, finally the result polygons are the final NFPs.
根据光线在晶体中的轨迹公式，计算了任意方向入射光所对应的尼科尔棱镜的临界角，得到了尼科尔棱镜的偏振区的限制曲线。
According to ray-tracing formulas of crystal, calculated the critical angles of Nicol prism for incident ray in any direction. Achieves the polarization critical curves of Nicol prism.
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