/// <summary>
/// 判断直线是否平行
/// </summary>
/// <param name="line1">直线1</param>
/// <param name="line2">直线2</param>
/// <returns>是否平行</returns>
public static bool Parallel(Line line1, Line line2)
{
Plane P = new Plane();
LineSegment3d l1 = new LineSegment3d(line1.StartPoint, line1.EndPoint);
LineSegment3d l2 = new LineSegment3d(line2.StartPoint, line2.EndPoint);
return(l1.IsCoplanarWith(l2, out P));
}
