internal.py 文件源码

def value(self, xyz):
        xyz = xyz.reshape(-1,3)
        a = self.a
        b = self.b
        c = self.c
        d = self.d
        vec1 = xyz[b] - xyz[a]
        vec2 = xyz[c] - xyz[b]
        vec3 = xyz[d] - xyz[c]
        cross1 = np.cross(vec2, vec3)
        cross2 = np.cross(vec1, vec2)
        arg1 = np.sum(np.multiply(vec1, cross1)) * \
               np.sqrt(np.sum(vec2**2))
        arg2 = np.sum(np.multiply(cross1, cross2))
        answer = np.arctan2(arg1, arg2)
        return answer