[vtkusers] please delete me from this group

[Balkrishna Bichu]

HI,
     could you please delete me from this group
-----Original Message-----
From: Bill Lorensen <wlorens1 at nycap.rr.com>
To: Charl P. Botha <c.p.botha at its.tudelft.nl>; vtkusers at public.kitware.com
<vtkusers at public.kitware.com>
Date: Thursday, 30 November 2000 3:29
Subject: Re: [vtkusers] bug with vtkVolume16Reader followed by
vtkImageGaussianSmooth


>Charles Law at Kitware found the problem and checked in the changes to
vtkVolume16Reader.
>
>Bill
>
>At 12:09 PM 11/23/00 +0100, Charl P. Botha wrote:
>>Dear VTK-ers,
>>
>>I have independently ran into the bug documented in:
>>http://public.kitware.com/pipermail/vtkusers/1999-September/002279.html
>>
>>At that stage, the VTK-experts were not able to duplicate the behaviour,
but
>>I plan to remedy that. :)
>>
>>It turns out that when a vtkImageGaussianSmooth follows a
vtkVolume16Reader
>>in a pipeline, the DataSpacing set on the vtkVolume16Reader is NOT
honoured!
>>I have attached a sample (reworked from the abovementioned archive mail)
>>that you should be able to run on any VTK installation.  Please copy this
>>into vtk/imaging/examplesTcl in your tree and run.
>>
>>In the output file "smooth.vtk" you'll notice that the "SPACING" is reset
to
>>[1 1 1], whereas it SHOULD be [0.84 0.84 8].  However, if you uncomment
the
>>line just below "reader SetDataSpacing 0.84 0.84 8", the spacing is
>>honoured.  This is only a possible workaround for this bug, but it
shouldn't
>>be necessary!
>>
>>I have confirmed this with both vtk312 release as well as a CVS checkout
of
>>23.11.2000.  I have scratched around in the code myself, and it seems that
>>the "output->SetSpacing()" call on line 230 of vtkVolume16Reader.cxx (in
>>vtkVolume16Reader::Execute()) might be too late... I do not know the
innards
>>of VTK well enough yet to make a correct fix myself.
>>
>>Further information: It also turns out that if you REUSE the pipeline,
i.e.
>>update() on the last component, then e.g. modify() one of the components
and
>>update() again, the SPACING _is_ honoured!  This correlates with my
feeling
>>that the output->SetSpacing() call in vtkVolume16Reader is simply in the
>>wrong place.
>>
>>If I can supply any more information, I will be glad to do so.
>>
>>Best regards (and thanks for a FANTASTIC tool),
>>Charl
>>
>>--
>>charl p. botha      | computer graphics and cad/cam
>>http://cpbotha.net/ | http://www.cg.its.tudelft.nl/
>>
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>
>
>
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