[vtkusers] SetDataSpacing = SetSpacing ?

[Chris Turner]

Hi John!

Thanks for your answer! But it still has no impact on the rendered
volume. Maybe there is something wrong with my pipeline. This is
basically the code I'm using:

# Get volume from another instance
inputVolume = scene.GetNodeByID(inVolume)

# The volume will be displayed by ray-cast alpha compositing.
# A ray-cast mapper is needed to do the ray-casting, and a
# compositing function is needed to do the compositing along the ray.
rayCastFunction = vtk.vtkVolumeRayCastCompositeFunction()

changer=vtk.vtkImageChangeInformation()
changer.SetInput(inputVolume.GetImageData())
changer.SetOutputSpacing(0.4,0.4,0.38)
changer.SetOutputOrigion(-49.424,-97.42,-14.825)

volumeMapper = vtk.vtkVolumeRayCastMapper()
volumeMapper.SetInput(chnager.GetOutputPort())
volumeMapper.SetVolumeRayCastFunction(rayCastFunction)

Volume = vtk.vtkVolume()
Volume.SetMapper(volumeMapper)

renderer.AddViewProp(Volume)


Looks good to me - what do you think?

Thanks,
Chris

On Wed, Jun 2, 2010 at 7:48 PM, John Drescher <drescherjm at gmail.com> wrote:
> On Wed, Jun 2, 2010 at 7:17 PM, Chris Turner
> <cturnercomplex at googlemail.com> wrote:
>> Hi,
>>
>> I noticed that in the Medical4 example the spacing of the CT Image is
>> set in the vtkVolume16Reader object with the method SetDataSpacing. If
>> I want to change the spacing of the CT Image after I loaded it can I
>> do that with the SetSpacing method on a vtkImageData object? Do those
>> have the same effect?
>>
>> Because for some reason changes at the spacing of the vtkImagaData
>> seems to have no impact on the displyed rendered volume...
>>
>> Anybody knows why?
>>
>
> I believe you are supposed to use vtkImageChangeInformation for this.
>
> John
>