[vtkusers] 3D-position of vtkImageReslice

[Xiaofeng Z]

have you tried to set:

 

reslice->SetOutputDimensionality(2);

 

This will cause the z-component of the resliced image position to zero.

Xiaofeng Zhao



 
> Date: Mon, 28 Jun 2010 15:46:48 -0400
> Subject: Re: [vtkusers] 3D-position of vtkImageReslice
> From: tutmann at gmail.com
> To: xf10036 at hotmail.com
> CC: vtkusers at vtk.org
> 
> Hi Xiaofeng,
> 
> it's me again with the 3D-Position issue in a vtkImageReslice.
> It seems to work great for relative positions like interactions for
> translations and stuff.
> But when I use it to paint directly into an image, I find, that the
> reported position is off in the direction of the viewer. The offset
> depends on the scale of the transform.
> So for my scale-settings a hack like this works somehow:
> 
> point[2] = 0.38; // Hack
> 
> But this cannot possibly the solution. Do you have any idea how to
> correct for this?
> 
> Thank you,
> 
> Henning
> 
> 2010/3/25 Xiaofeng Z <xf10036 at hotmail.com>:
> > It took me a day to figure out:
> >
> > // first convert from display to world in the resliced coordinate
> > vtkRenderer& rndr =
> > *interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer();
> > rndr.SetDisplayPoint(currPos[0], currPos[1], 0);
> > rndr.DisplayToWorld();
> > double point[4];
> > rndr.GetWorldPoint(point);
> > // the value in the third component is fake, why???
> > point[2] = 0.0;
> >
> > // next, convert back to the original vtkImageData coordinate system
> > vtkImageReslice* reslice = ImageReslice;
> > reslice->GetOutput()->UpdateInformation();
> > vtkImageData& slice = *reslice->GetOutput();
> > vtkMatrix4x4 *matrix = reslice->GetResliceAxes();
> > double center[4];
> > matrix->MultiplyPoint(point, center);
> >
> >
> > Hope this works!
> >
> > Xiaofeng Zhao
> >
> >
> >
> >> Date: Wed, 24 Mar 2010 16:09:57 -0400
> >> From: tutmann at gmail.com
> >> To: vtkusers at vtk.org
> >> Subject: [vtkusers] 3D-position of vtkImageReslice
> >>
> >> Hello,
> >>
> >> I'm building an application based on ImageProcessing/Cxx/ImageSlicing.cxx.
> >> Currently I'm on my way of writing my own interactor style in order to
> >> have more flexible interaction freedom.
> >>
> >> Rotation, windowing and zoom works fine - but now I want to move my
> >> Volume by dragging the mouse. The movement should be in sync with the
> >> mouse motion.
> >> Therefore I'd like to find out the real 3D-Position (in the volume) of
> >> the EventPosition and the LastEventPosition.
> >> But I don't know how to do that. The Display chain is like:
> >>
> >> vtkImageData -> vtkImageReslice -> vtkImageMapToColors ->
> >> vtkImageActor -> vtkRenderer -> vtkViewPort
> >>
> >>
> >> How can I find out the amount of translation that has to be applied to
> >> the ResliceAxes-Matrix? (I already have the right direction - am just
> >> missing the scaling value of the translation).
> >>
> >>
> >> Thank you for your help!
> >>
> >> Henning
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