[vtkusers] vtkImageActor - changing display extent pb persists

[Lisa Avila]

Hello Dean,

We use vtkImageActor this way in VolView and it works fine. Are you certain 
that you move the camera to point down the X axis when you make the change 
in your display extent?

Also, you need to ignore the comment about Set/GetZSlice and 
GetWholeZMin/Max - these method are implemented only for looking at XY 
slices (where Z is really Z). So don't use those to set your slice if you 
are viewing down another axis - but setting the display extent (and 
changing it to another axis) should work just fine.

When you say that image actor is not updating properly - does this mean 
that you can see the X and Y slices, but not after you have viewed a Z slice?

Lisa


At 03:28 PM 10/2/2003, dean.inglis at camris.ca wrote:
>Hi,
>
>still having pbs  with vtkImageActor.  My data is
>512 x 512 x 64 (x,y,z) and my pipeline is:
>vtkImageReader -> vtkImageMapTocolors -> vtkImageActor
>
>running on a Win2k Intel P4 with NVIDIA GeForce card,
>latest cvs vTK, MinSizeRel Borland compile.
>This happens on two other Win2k systems so I
>dont think its a chip/driver/video card pb.
>
>If I originally set the vtkImageActor display extents to
>0,511,511,0,0 and call GetWholeZMin, GetWholeZMax, I get
>the expected 0, 63 respectively and the x-y plane data
>displays correctly.  However, if I switch axes by setting
>the display extent to 0,0,0,511,0,63 no image is
>rendered by the actor and GetWholeZMin, GetWholeZMax still
>returns 0,63 and not the expected 0,511!
>
>I am trying to use 1 vtkImageActor, and not 3 (one for each
>anatomical axis).  Even though changing the DisplayExtent
>forces the vtkImageActor to call Modified on itself, it does
>not appear to be updating properly.
>
>Dean
>
>
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