向量旋转

ywlm

如何实现将一个向量绕自身的Z轴旋转

雪山飞狐_lzh

何谓向量自身的Z轴？

ywlm

谢谢你的反问，才明白这个问题问错了。我想想该怎么问。

ywlm

能否从一个向量来获得坐标系，并将这个坐标系绕自身的Z轴旋转10度?

chpmould

狐哥有发过一篇有关向量的帖,建议楼主看看...

http://bbs.mjtd.com/thread-81457-1-1.html

ywlm

下面这段代码能实现这个功能，只是不知道这样写是否合理，是我瞎掰的。

2. 
   
3.     <CommandMethod("t2")> _
   
4.     Public Sub t2()
   
5.         Dim pt1 As New Point3d(100, 200, 300)
   
6.         Dim pt2 As New Point3d(400, 600, 1100)
   
7.         Dim vec As Vector3d = pt2 - pt1
   
8.         Dim mt As Matrix3d = Matrix3d.PlaneToWorld(vec.GetNormal)
   
9.         Dim A As Double = Math.PI / 4
   
10.         Dim s As CoordinateSystem3d = ed.CurrentUserCoordinateSystem.CoordinateSystem3d
    
11.         Dim x As Vector3d = mt.CoordinateSystem3d.Xaxis.RotateBy(A, mt.CoordinateSystem3d.Zaxis)
    
12.         Dim y As Vector3d = mt.CoordinateSystem3d.Yaxis.RotateBy(A, mt.CoordinateSystem3d.Zaxis)
    
13.         mt = Matrix3d.AlignCoordinateSystem(s.Origin, s.Xaxis, s.Yaxis, s.Zaxis, pt1, _
    
14.                                          x, y, x.CrossProduct(y))
    
15.         ed.CurrentUserCoordinateSystem = mt
    
16.     End Sub

<br />     <CommandMethod("t2")> _<br />     Public Sub t2()<br />         Dim pt1 As New Point3d(100, 200, 300)<br />         Dim pt2 As New Point3d(400, 600, 1100)<br />         Dim vec As Vector3d = pt2 - pt1<br />         Dim mt As Matrix3d = Matrix3d.PlaneToWorld(vec.GetNormal)<br />         Dim A As Double = Math.PI / 4<br />         Dim s As CoordinateSystem3d = ed.CurrentUserCoordinateSystem.CoordinateSystem3d<br />         Dim x As Vector3d = mt.CoordinateSystem3d.Xaxis.RotateBy(A, mt.CoordinateSystem3d.Zaxis)<br />         Dim y As Vector3d = mt.CoordinateSystem3d.Yaxis.RotateBy(A, mt.CoordinateSystem3d.Zaxis)<br />         mt = Matrix3d.AlignCoordinateSystem(s.Origin, s.Xaxis, s.Yaxis, s.Zaxis, pt1, _<br />                                          x, y, x.CrossProduct(y))<br />         ed.CurrentUserCoordinateSystem = mt<br />     End Sub

sieben

楼主说的应该是实体绕实体的Normal向量旋转吧？Normal属性应该是平面类型实体才有的