[Paraview] Write a reader plugin

[Adriano Gagliardi]

Utkarsh,

I believe some time ago I asked something similar regarding the having the
reader making a call to RequestInformation before actually hitting the Apply
button. Paul (Edwards) mentioned modifying the vtkGet/SetMacro to do this
automatically. I tried it briefly and I got something to compile, but it
didn't work and crashed out with segmentation fault. 

Is it possible, in both cases, to achieve this by modifying some of the
lower-level vtk code?

Regards,

Adriano

===================================

Adriano Gagliardi MEng PhD
Business Sector Leader
Computational Aerodynamics
Aircraft Research Association Ltd.
Manton Lane
Bedford

Tel: 01234 32 4644
E-mail: agagliardi at ara.co.uk
Url: www.ara.co.uk 
-----Original Message-----
From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org]
On Behalf Of Utkarsh Ayachit
Sent: 07 February 2011 14:50
To: Xunlei Wu
Cc: paraview at paraview.org
Subject: Re: [Paraview] Write a reader plugin

Xunlei,

Are you expecting to see the extents setup correctly before hitting the
Apply button the first time? That indeed won't be the case. You'll have to
hit apply and let the actual data-reading happen before the information will
be shown on the "information tab".

Utkarsh

On Sat, Feb 5, 2011 at 5:46 PM, Xunlei Wu <xunlei at renci.org> wrote:
> Hi David and All,
>
> I still have trouble seeing any updates in ParaView (ParaView Git built
from source with VS2008 and Qt 4.6.3 on Windows 7 64bit) after loading a
GRIB2 file. For simiplicity, I have created a skeleton version of my GRIB2
reader. I have only implemented RequestInformation() with some fabricated
WHOLE_EXTENT() data. I have successfully built such reader as a plugin .dll
(Windows) and loaded it into ParaView through Tool -> Manage Plugins. After
you load a grib2 file also attached, RequestInformation() is called and
WHOLE_EXTENT() has been updated. However, I do not see such change in
"Object Inspector" -> "Information" panel.
> I am not sure what I did wrong. And is there anything special I need to do
when build ParaView from source? FYI, "BUILD_SHARED_LIB" is on.
> Would you please help me? Thank you very much.
>
> Best,
> x
>
> -----Original Message-----
> From: Xunlei Wu
> Sent: Friday, January 21, 2011 12:10 PM
> To: David Doria
> Cc: paraview at paraview.org
> Subject: RE: Write a reader plugin
>
> Hi All,
> Do you have any suggestions? Thanks a lot.
> Best,
> xunlei
>
> -----Original Message-----
> From: Xunlei Wu
> Sent: Saturday, January 15, 2011 5:44 PM
> To: 'David Doria'
> Cc: 'paraview at paraview.org'
> Subject: Write a reader plugin
>
> Hi David and all,
> I am writing a reader plugin for ParaView. A test program without the 
> VTK wrapping approves that I can get all the header (metadata) and 
> grid data correctly. However, when I following the examples posted in 
> http://www.vtk.org/Wiki/ParaView/Examples/Plugins/Reader
> http://www.kitware.com/products/html/WritingAParaViewReaderPlug-in.htm
> l
> and vtkStructuredGridReader.h/.cxx
>
> I got confused. Shall I subclass vtkStructuredGridAlgorithm or
vtkStructuredGridReader? What are the differences? With minor differences in
the code, i.e. defining char* FileName, I have both scenarios built fine.
>
> Let's say, we are subclassing vtkStructuredGridAlgorithm for now on. 
> After I populate values as the following
>
> int vtkGRIB2Reader::RequestInformation(vtkInformation* 
> vtkNotUsed(request),                                                      
      
> vtkInformationVector** vtkNotUsed(inputVector),                          
                      
> vtkInformationVector *outputVector) {
>        ...
>        vtkInformation* outInfo = 
> outputVector->GetInformationObject(0);
>
>        outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),  
> ext, 6);
>        outInfo->Set(vtkDataObject::SPACING(),  this->Spacing, 3);
>        outInfo->Set(vtkDataObject::ORIGIN(),   this->Origin, 3);
>
>        return 1;
> }
>
> In ParaView Object Inspector / Information widget, I did not see any
update in all the fields except Statistics / Type: Structured (Curvilinear)
Grid. Would you please help me? Did I populate outInof in the wrong place?
Thanks a lot.
>
> Best,
> xunlei
>
>
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