plane.py 文件源码

def from_points_and_vector(cls, p1, p2, vector):
        '''
        Compute a plane which contains two given points and the given
        vector. Its reference point will be p1.

        For example, to find the vertical plane that passes through
        two landmarks:

            from_points_and_normal(p1, p2, vector)

        Another way to think about this: identify the plane to which
        your result plane should be perpendicular, and specify vector
        as its normal vector.

        '''
        from blmath.numerics import as_numeric_array

        p1 = as_numeric_array(p1, shape=(3,))
        p2 = as_numeric_array(p2, shape=(3,))

        v1 = p2 - p1
        v2 = as_numeric_array(vector, shape=(3,))
        normal = np.cross(v1, v2)

        return cls(point_on_plane=p1, unit_normal=normal)