[vtkusers] Problem with use of vtkImageChangeInformation::SetOutputSpacing()

[Jérôme]

Daniela,
I forward to the VTK mailing list so that everybody knows that the
problem is solved. However, I am a bit curious: which solution did you
used?

Best regards,
Jerome

2010/6/2 Daniela Sacchetto <danysunflower at hotmail.it>:
> Thanks a lot!
>
> Your suggestions help me to solve my problem....
>
> Regards
> Daniela
>
>> Date: Tue, 1 Jun 2010 20:40:55 +0200
>> Subject: Re: [vtkusers] Problem with use of
>> vtkImageChangeInformation::SetOutputSpacing()
>> From: jerome.velut at gmail.com
>> To: emonson at cs.duke.edu
>> CC: danysunflower at hotmail.it; vtkusers at vtk.org
>>
>> Hi,
>> Another solution would be to set the two first arguments to
>> VTK_DOUBLE_MAX. By reading the code, it seems that it will keep the
>> input spacing:
>>
>> file vtkImageChangeInformation
>>
>> line 148: inInfo->Get(vtkDataObject::SPACING(), spacing);
>>
>> Then, a few line further, you find:
>>
>> for (i = 0; i < 3; i++)
>> {
>> if (this->OutputSpacing[i] != VTK_DOUBLE_MAX)
>> {
>> spacing[i] = this->OutputSpacing[i];
>> }
>> ...
>> }
>>
>> line 188: outInfo->Set(vtkDataObject::SPACING(),spacing,3);
>>
>> It has to be checked, but one again, I think that the command
>> changeInformationFilter->SetOutputSpacing( VTK_DOUBLE_MAX,
>> VTK_DOUBLE_MAX, myCustomZSpacing );
>> would do the trick.
>>
>> If not, Eric's solution is the one that simply work!
>>
>> HTH
>> Jerome
>>
>>
>> 2010/6/1 Eric E. Monson <emonson at cs.duke.edu>:
>> > Hey Daniela,
>> > You should be able to get the original spacing of you image data in each
>> > direction from the data itself with one of the GetSpacing() methods:
>> > http://www.vtk.org/doc/nightly/html/classvtkImageData.html
>> > -Eric
>> > ------------------------------------------------------
>> > Eric E Monson
>> > Duke Visualization Technology Group
>> >
>> > On Jun 1, 2010, at 11:49 AM, Daniela Sacchetto wrote:
>> >
>> > Thanks Jerome for your advise but I not able to use this class.
>> > I think that I have to use
>> >
>> > vtkImageChangeInformation::SetOutputSpacing(float, float, float)
>> >
>> > but I don't understand how to set float parametres to have the effect
>> > desired: I want only change the slice distance, so I think that I have
>> > to
>> > set the value desired as third parameter between brackets, but I don't
>> > know
>> > how set the other....
>> >
>> > Have anyone an example for me?
>> >
>> > Regards
>> > Daniela
>> >
>> >> Date: Tue, 1 Jun 2010 10:16:03 +0200
>> >> Subject: Re: [vtkusers] Filter to set the slice distance in a 3D
>> >> rendered
>> >> volume
>> >> From: jerome.velut at gmail.com
>> >> To: danysunflower at hotmail.it
>> >> CC: daviddoria+vtk at gmail.com; vtkusers at vtk.org
>> >>
>> >> Hi Daniela,
>> >>
>> >> I think you can use the vtkImageAppend filter together with the
>> >> vtkImageChangeInformation.
>> >>
>> >> HTH
>> >> Jerome
>> >>
>> >>
>> >> 2010/6/1 Daniela Sacchetto <danysunflower at hotmail.it>:
>> >> > Ok, sorry,  I'll try to explain in an other way...
>> >> > I have a 3D rendered volume that is ok but its Z dimension is too
>> >> > little....I would like to set the Z dimenmsion (for example setting
>> >> > the
>> >> > pixels or slices distance)...
>> >> > I know that there is a Itk method (ImageType::SpacingType) that
>> >> > allows
>> >> > to
>> >> > set the pixels distance....Is there a VTK method that allows to
>> >> > render
>> >> > my
>> >> > image with a note distance in Z direction?
>> >> >
>> >> > I hope that now you could understand better my problem...
>> >> > Regards
>> >> > Daniela
>> >> >
>> >> >> Date: Mon, 31 May 2010 17:22:38 -0400
>> >> >> Subject: Re: [vtkusers] Filter to set the slice distance in a 3D
>> >> >> rendered
>> >> >> volume
>> >> >> From: daviddoria+vtk at gmail.com
>> >> >> To: danysunflower at hotmail.it
>> >> >> CC: vtkusers at vtk.org
>> >> >>
>> >> >> On Mon, May 31, 2010 at 5:08 PM, Daniela Sacchetto
>> >> >> <danysunflower at hotmail.it> wrote:
>> >> >> > Hi everyone
>> >> >> > I'm new in vtk and I'm trying to do a work for my thesis.
>> >> >> >
>> >> >> > I have to improve a code that gives a 3D volume from 2D slices
>> >> >> > (.jpg
>> >> >> > or
>> >> >> > other formats).
>> >> >> > My code has to be improved because the 3D visualized with VTK (I'm
>> >> >> > using
>> >> >> > vtkVolumeRayCastCompositeFunction) is too "slim": I would like to
>> >> >> > modifie
>> >> >> > the Z dimension.
>> >> >> > Have anyone found this problem yet? Could anyone suggest me a VTK
>> >> >> > method
>> >> >> > or
>> >> >> > class that do something similar?
>> >> >> >
>> >> >> > Regards
>> >> >> > Daniela
>> >> >>
>> >> >> I don't know what you mean by "slim". Can you give us a sample data
>> >> >> set or a screenshot of what you have and an explanation of what is
>> >> >> wrong?
>> >> >>
>> >> >> You may want to look into the Marching Cubes algorithm:
>> >> >>
>> >> >>http://www.vtk.org/Wiki/VTK/Examples/Medical/GenerateModelsFromLabels
>> >> >>
>> >> >> Good luck,
>> >> >>
>> >> >> David
>> >> >
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