[Paraview] python/VTK errors in Paraview

[pat marion]

Hi Karl,

The volume representation needs a set of valid scalars.  In the GUI,
the color-by scalars are automatically switched for you when you
change the representation combobox to Volume.  In python you'll need
to do something like this:

SetDisplayProperties(reader, ColorArrayName='SomeVariableName')

Where SomeVariableName is the scalar array you want to use for volume
rendering.  Try doing this before setting Representation='Volume'.

Pat

On Fri, Aug 21, 2009 at 11:41 AM, Karl Battams<karlbattams at gmail.com> wrote:
> Thanks!  That did it!
>
> Next problem, along similar lines.  I want to simply volume render a vtk
> file I have.  If I do everything from within the paraview app, it works
> fine.  But if I try to do the following from the python shell (or pvpython)
> it seg faults on me:
>
>>>> reader=LegacyVTKReader(FileNames="/home/battams/model.vtk")
>>>> Show(reader)
>>>> SetDisplayProperties(reader,Representation='Volume')
>
> Here's the error I get in my terminal:
>
> ERROR: In
> /home/battams/Builds/Paraview3/ParaView3/VTK/VolumeRendering/vtkFixedPointVolumeRayCastMapper.cxx,
> line 1467
> vtkFixedPointVolumeRayCastMapper (0x7fc7b7368010): Cell Scalars not
> supported
> [3]    Segmentation fault            paraview
>
> It looks to me like the problem is my model because of the "Cell scalars not
> supported" message.  But I can load/view it fine if I just use the ParaView
> GUI.
>
> Apologies in advance if I'm making some sort of stupid beginner mistake...
>
> ~~Karl
>
> On Fri, Aug 21, 2009 at 11:08 AM, Utkarsh Ayachit
> <utkarsh.ayachit at kitware.com> wrote:
>>
>> When you creating the readers using python shell from the GUI (not
>> pvpython or pvbatch), it's recommended that you set the FileName in
>> the constructor itself. So try:
>>
>> > reader = LegacyVTKReader(FileNames="foo.vtk")
>>
>> Utkarsh
>>
>> On Fri, Aug 21, 2009 at 10:04 AM, Karl Battams<karlbattams at gmail.com>
>> wrote:
>> > Hi,
>> >
>> > I'm using the latest CVS build of Paraview (on Ubuntu) and am getting
>> > some
>> > errors when I try to do python scripting from the Python shell.  I start
>> > ParaView and bring up the python shell, and type the simple command:
>> >
>> >>>> reader=LegacyVTKReader()
>> > As soon as I enter this command, the error console pops up saying:
>> >
>> > ERROR: In
>> > /home/battams/Builds/Paraview3/ParaView3/VTK/Filtering/vtkExecutive.cxx,
>> > line 757
>> >
>> > vtkCompositeDataPipeline (0x253f0b0): Algorithm
>> > vtkFileSeriesReader(0x2560aa0) returned failure for request:
>> > vtkInformation
>> > (0xd1e190)
>> >
>> > Debug: Off
>> >
>> > Modified Time: 197255
>> >
>> > Reference Count: 1
>> >
>> > Registered Events: (none)
>> >
>> > Request: REQUEST_DATA_OBJECT
>> >
>> > ALGORITHM_AFTER_FORWARD: 1
>> >
>> > FORWARD_DIRECTION: 0
>> >
>> > It has a similar error for vtkPDataSetReader.  It then has the lines:
>> >
>> > ERROR: In
>> >
>> > /home/battams/Builds/Paraview3/ParaView3/Servers/Common/vtkSelfConnection.cxx,
>> > line 147
>> > vtkSelfConnection (0x14ef4f0): Failed to locate object with ID: 154
>> >
>> > ERROR: In
>> >
>> > /home/battams/Builds/Paraview3/ParaView3/Servers/ServerManager/vtkSMOutputPort.cxx,
>> > line 293
>> >
>> > vtkSMOutputPort (0x152f200): Missing data information.
>> >
>> > And then some more output like the top part.
>> >
>> > Now what seems odd to me is that it is complaining about errors in my
>> > build
>> > directory, but I installed Paraview to /usr/local.  But the same error
>> > persists, even if I actually remove the build directory before running
>> > paraview.  But perhaps I'm misunderstanding something.  Regardless, I
>> > get
>> > the above errors when python scripting.  Any ideas?
>> >
>> > Also, in my CMakeOutput.log file I see the message:
>> >
>> > Determining if glXGetProcAddressARB exists in GL/glx.h FALSE
>> >
>> > ...leading to an error...
>> >
>> >
>> > /home/battams/Builds/Paraview3/ParaView3/VTK/Rendering/CheckglXGetProcAddressARB.cxx:
>> > In function 'int main(int, char**)':
>> >
>> > /home/battams/Builds/Paraview3/ParaView3/VTK/Rendering/CheckglXGetProcAddressARB.cxx:33:
>> > error: 'glXGetProcAddressARB' was not declared in this scope
>> > make[1]: ***
>> > [CMakeFiles/cmTryCompileExec.dir/CheckglXGetProcAddressARB.cxx.o] Error
>> > 1
>> > make[1]: Leaving directory
>> > `/home/battams/Builds/paraview-bin/CMakeFiles/CMakeTmp'
>> > make: *** [cmTryCompileExec/fast] Error 2
>> >
>> > Is this related?  Or an entirely different problem?  (or not a problem
>> > at
>> > all?)
>> >
>> > Thanks!
>> >
>> > ~~Karl
>> >
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>
>
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