[vtkusers] changing the positions of points

[Glen Lehmann]

Hi Toh,

You just need to add a polyVertexPoints->Modified() before the second 
render call.

Cheers,
Glen

On Jan 12, 2005, at 10:55 PM, Toh Da Jun wrote:

> I created 8 points...and rendered them on screen. Even though i changed
> the position of one of the points, it does not get updated on the
> screen. I tried re-rendering the vtkRenderer ren1, and vtkRenderWindow
> renWin, but it still does not get updated.
>
> Any idea where i went wrong?
>
>
> tohdj
>
>
>
>
>
>
> vtkPoints polyVertexPoints
>   polyVertexPoints SetNumberOfPoints 8
>   polyVertexPoints InsertPoint 0 0 0 0
>   polyVertexPoints InsertPoint 1 1 0 0
>   polyVertexPoints InsertPoint 2 1 1 0
>   polyVertexPoints InsertPoint 3 1 0 1
>   polyVertexPoints InsertPoint 4 0 1 1
>   polyVertexPoints InsertPoint 5 0 0 1
>   polyVertexPoints InsertPoint 6 0 1 0
>   polyVertexPoints InsertPoint 7 1 1 1
> vtkPolyVertex aPolyVertex
>   [aPolyVertex GetPointIds] SetNumberOfIds 8
>   [aPolyVertex GetPointIds] SetId 0 0
>   [aPolyVertex GetPointIds] SetId 1 1
>   [aPolyVertex GetPointIds] SetId 2 2
>   [aPolyVertex GetPointIds] SetId 3 3
>   [aPolyVertex GetPointIds] SetId 4 4
>   [aPolyVertex GetPointIds] SetId 5 5
>   [aPolyVertex GetPointIds] SetId 6 6
>   [aPolyVertex GetPointIds] SetId 7 7
> vtkUnstructuredGrid aPolyVertexGrid
>   aPolyVertexGrid Allocate 1 1
>   aPolyVertexGrid InsertNextCell [aPolyVertex GetCellType] [aPolyVertex
> GetPointIds]
>   aPolyVertexGrid SetPoints polyVertexPoints
> vtkDataSetMapper aPolyVertexMapper
>   aPolyVertexMapper SetInput aPolyVertexGrid
> vtkActor aPolyVertexActor
>   aPolyVertexActor SetMapper aPolyVertexMapper
>   aPolyVertexActor AddPosition 0 0 0
>  [aPolyVertexActor GetProperty] SetDiffuseColor 1 1 1
>
>
> # Create the usual rendering stuff.
> vtkRenderer ren1
> vtkRenderWindow renWin
>   renWin AddRenderer ren1
> #  renWin PrefFullScreen
>   renWin SetSize 500 500
> vtkRenderWindowInteractor iren
>   iren SetRenderWindow renWin
>
> ren1 SetBackground .0 .0 .0
>
> ren1 AddActor aPolyLineActor
> ren1 AddActor aPolyVertexActor
>
> [ren1 GetActiveCamera] Azimuth 30
> [ren1 GetActiveCamera] Elevation 20
> [ren1 GetActiveCamera] Dolly 2.8
> ren1 ResetCameraClippingRange
>
> renWin Render
>
> polyVertexPoints SetPoint 7 2 2 2   # Change the position of pointID #7
>
> renWin Render
>
> # render the image
> iren AddObserver UserEvent {wm deiconify .vtkInteract}
> iren Initialize
>
>
> # Reset the view to zoom all in
> ren1 ResetCamera
> iren Render
>
>
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