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

[Anja Ende]

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> 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
>
> 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
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20060925/03590677/attachment.htm>