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

[Eric E. Monson]

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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