[vtkusers] 3D-position of vtkImageReslice

[Henning Meyer]

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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