[vtkusers] Re: vtkTransform...almost there!

[David Gobbi]

Hi Anja,

If you can send me your code in an easy-to-compile form (i.e. as a tar 
or zip file with a CMakeLists.txt) then I can look it over and give you 
some advice.

 - David


Anja Ende wrote:
> Hi everyone,
>
> Just wondering if this has got something to do with the extents and if 
> there has to be some manual setting that has to be done. The reslicer 
> is working in 2D mode.
>
> One curious thing is that there are different results when auro crop 
> output is turned on the reslicer. For example, if you rotate the slice 
> along the normal, it rotates differently, if you the auto crop output 
> set on than if you have it off... Struggling to understand what is 
> actually happening here...
>
> Again, if someone could help me a bit here, I would be really 
> grateful. I can send some code if someone could help me diagnose what 
> is happening here. Completely lost here...
>
> Thanks,
> Anja
>
>
>
> On 25/09/06, *Anja Ende* <anja.ende at googlemail.com 
> <mailto:anja.ende at googlemail.com>> wrote:
>
>     Hi everyone,
>
>     I was getting really frustrated with getting the vtkTransform this
>     weekend. I finally have it working properly (almost!) with the
>     oblique slicing and the subsequent transformations.
>
>     The thread is here:
>     http://public.kitware.com/pipermail/vtkusers/2006-September/087168.html
>     <http://public.kitware.com/pipermail/vtkusers/2006-September/087168.html>
>
>     The only issue that remains is that of adjusting for the change in
>     the slice position in the display.
>
>     So, basically this is what is happening:
>
>     I have a display that shows the 3 orthogonal slice initially. Then
>     I rotate the slices about a picked point in the Z axes. Now, the
>     size of the slice would depend on where the rotation point lies,
>     of course. I notice that the slice gets translated on the screen
>     display and the amount of displacement depends on the rotation
>     center.
>
>     Now, when I try to calculate the transformed point on the screen,
>     I need to know the position of the 2D actor. However, even after
>     the displacement the actor returns the same position.
>
>     Basically, after the rotation I need to update some onscreen
>     markers and these markers are not been shown a bit off as the
>     slice keeps jumping on the screen.
>
>     This happens whether I have set the AutoCropOutputOn() or Off() on
>     the vtkImageReslice.
>
>     If anyone has any ideas of what is happening, I would be really
>     grateful. This problem has me stumped for days now...
>
>     Thanks and best,
>
>     Anja
>
>
>
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