This paper presented the solution of normal vector by using the method of the accumulative hypotenuse trispline curve.
采用累加弦长三次样条参数曲线，先求出离散点处两个方向的切矢，进而求解出该离散点的法矢。
The existing algorithms include equivalent left and right curve Angle by definition, normal section line method and tangent projection etc.
有关的算法有根据定义的左右曲面角相等，法截面法和切向投影等。
Crowd excitation is simulated by random method according to normal footfall force curve and other individual factors such as distribution of crowd, step frequency and physiological characteristics.
根据单步落足曲线，结合影响人群行走效应的因素如人群分布、行走频率及个体生理特征等，采用随机方法模拟人群行走激励。
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