How to get the position and angle of the crosshair?

Development
1

How to get the position and angle of the crosshair?

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I try to crosshair = slicer.util.getNode('Crosshair')
and print(crosshair),get those :

vtkMRMLCrosshairNode (0x7fea623dbca0)
  ID: vtkMRMLCrosshairNodedefault
  ClassName: vtkMRMLCrosshairNode
  Name: Crosshair
  Debug: false
  MTime: 17590155
  Description: (none)
  SingletonTag: default
  HideFromEditors: true
  Selectable: true
  Selected: false
  UndoEnabled: false
  CrosshairMode: NoCrosshair
  CrosshairBehavior: CenteredJumpSlice
  CrosshairThickness: Thick
  CrosshairRAS: [-3.89054, -24.6428, 202.575]
  FastPick3D: false

There is no information about angle…

@lassoan@Juicy@jamesobutler @jcfr @pieper

2

这个似乎不是crosshair的问题…应该是返回"the orthogonal nodes around the common intersection point"的位置和角度问题…
我用 sliceToRAS = slicer.mrmlScene.GetNodeByID(sliceNodeId).GetSliceToRAS()得到了4x4martix, 怎么能够利用该变量, Set the slice to ras呢?

This does not seem to be a crosshair problem… It should be a problem of the position and angle of returning “the orthogonal nodes around the common intersection point”… I used sliceToRAS = slicer.mrmlScene.GetNodeByID(sliceNodeId).GetSliceToRAS() to get 4x4martix, how can I use this Variables, howto Set the slice to ras?

3

The crosshair only stores position and the current core node ID. If you current view is a slice node then you can get the orientation of that slice from the SliceToRAS matrix.

What are you trying to achieve?

4

I tried to get the slicenormal form def getPlaneIntersectionPoint, and then Set slice position and orientation from a normal vector and position.
but I haven’t got the slicenormal yet…do you help me?

5

Slice normal is the third column of the SliceToRAS matrix.

6

yes, I’ve got sliceposition and slicenormal from the def getPlaneIntersectionPoint through return x,n1,n2,n3, and then Set slice position and orientation from a normal vector and position.

谢谢老师