[vtkusers] 3D-position of vtkImageReslice

[Xiaofeng Z]

What do you mean by "scale of transformation"?

Xiaofeng Zhao





> Date: Mon, 28 Jun 2010 18:06:10 -0400
> Subject: Re: [vtkusers] 3D-position of vtkImageReslice
> From: tutmann at gmail.com
> To: xf10036 at hotmail.com
> CC: vtkusers at vtk.org
> 
> yes, I did it. strange - still z-off coordinates.
> 
> 2010/6/28 Xiaofeng Z <xf10036 at hotmail.com>:
> > 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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