/// <summary>
/// 围绕某点旋转, 角度的单位为弧度
/// </summary>
/// <returns>The around.</returns>
/// <param name="point">Point.</param>
/// <param name="axis">Axis.</param>
/// <param name="angle">Angle.</param>
static public Vector3 RotateAround(this Vector3 position, Vector3 point, Vector3 axis, float angle)
{
Vector3 vector = position;
Quaternion rotation = VectorMath.AngleAxis(angle, axis);
Vector3 vector2 = vector - point;
vector2 = rotation * vector2;
vector = point + vector2;
position = vector;
return(position);
}