I followed 2 writer examples (cpp, hpp) : Xdmf writer and OpenFOAM
writer. Complexity is high, still difficult to extract basic needs out
of them.
Question 1 : how to write myWriter.xml ?
1.1. seems I must set <InputProperty command="SetInputConnection"
name="Input"> in myWriter.xml. Does this means I will also have to
implement myWriter::SetInputConnection ?
1.2. seems I must set <StringVectorProperty name="FileName"
command="SetFileName"> in myWriter.xml. Does this means I will also have
to implement myWriter::SetFileName ?
I am correct ?
Question 2 : how to implement a vtk object ? From here
http://www.vtk.org/Wiki/VTK/Examples/Developers/vtkObject, it seems that
2.1. in myWriter.cpp, I need to have :
#include "vtkObjectFactory.h" // vtkStandardNewMacro
vtkStandardNewMacro ( myWriter ); // use vtkStandardNewMacro : 1 only
allowed constructor, omit the copy constructor and operator=
+ suppress copy constructor and operator=
2.2 in myWriter.hpp, I need to derive from a vtkObject this way (like
XdmfWriter.cpp does) :
class myWriter : public vtkDataObjectAlgorithm {
public:
static myWriter * New (); // Needed to be plugged into paraview
vtkTypeMacro ( myWriter, vtkDataObjectAlgorithm ); // Needed to be
plugged into paraview
+ suppress copy constructor and operator=
Am I correct ?
Question 3 : in myWriter.cpp, on which method I am supposed to be
called back (to get focus back) when I click the "save data" button ?
Here, how can I get data to be saved (data that I can see in paraview
viewer before to click the save button - I guess this data will be a
vtk*).
Finally, myWriter.xml seems OK. myWriter.*pp compile OK. Paraview finds
myWriter.xml at run time (exporting PV_PLUGIN_PATH) and loads
libmywriter.so without problem. I see the writer in the "save data" GUI
(drop down list with different save formats). I save with myWriter, I
get a (basic) GUI with file name only (no extra parameter) : I crash
when I click "OK, save" with this error message :
ERROR: In
/.../ParaView-v4.3.1-source/ParaViewCore/ServerImplementation/Core/vtkSIProxy.cxx,
line 307
vtkSIWriterProxy (0x30143d0): Failed to create myWriter. Aborting for
debugging purposes.
vtkSIWriterProxy does this at line 303 :
vtkObjectBase* obj = this->Interpreter->NewInstance(className);
but obj is NULL.
I get obj is NULL because I missed something in myWriter implementation
: what did I miss ?
Can somebody help ? Or even get me some clue ?
FH
-------- Message original --------
Objet: How to plug into paraview his own writer ?
Date: 2015-06-12 15:54
De: houssen <[email protected]>
À: <[email protected]>
I followed 2 tutorials
(http://www.itk.org/Wiki/ParaView/Plugin_HowTo#Writing_Plugins,
http://www.kitware.com/media/html/WritingAParaViewReaderPlug-in.html)
but I feel like I missed some steps : this is not working.
I need to "catch" data (I can see in 2D/3D paraview viewer) to write
them into a specific file format. I am looking for the minimal
(simplest) way to do this : the only writer input is the file name, then
I would like to understand how to "get data from" paraview (from inside
a vtk object I guess ?), then I just will have to do the easy part which
is to write data to a specific format.
My understanding is that, first I need a CMakeLists.txt like :
~> more CMakeLists.txt
FIND_PACKAGE ( ParaView REQUIRED )
INCLUDE ( ${PARAVIEW_USE_FILE} )
ADD_PARAVIEW_PLUGIN ( myWriter "1.0" SERVER_MANAGER_XML myWriter.xml
SERVER_MANAGER_SOURCES myWriter.cpp )
In the same directory, I need a (minimal) myWriter.xml file that looks
like :
~> more myWrite.xml
<ServerManagerConfiguration>
<ProxyGroup name="WRITERS">
<SourceProxy name="MYWRITER" class="MYWRITER" label="my writer">
<Documentation short_help="my own writer"/>
<InputProperty>
<StringVectorProperty name="FileName" command="SETFILENAME"
number_of_elements="1"/>
</InputProperty>
<Hints>
<WriterFactory extensions="mw" file_description="my written file"/>
</Hints>
</SourceProxy>
</ProxyGroup>
</ServerManagerConfiguration>
My understanding is that somehow the xml subscribes my for a specific
callback I am called back on the "save data" button is cliked in the
GUI.
Still, in this same directory, I have myWriter.cpp and myWriter.hpp :
how to implement them ?
1. The myWriter class must define and implement a SetFileName method
because of the <StringVectorProperty> xml tag in myWriter.xml : right ?
wrong ?
This is the file name (including file path) one sets in the GUI :
right ? wrong ?
2. myWriter is supposed to derive from another class : which one ?
where to find it ?
3. How the myWriter implementation will "catch" data in paraview ?
Which method to override / re-implement ?
When I am called from paraview (triggered by the click on "save
data" button), I guess I am called on a specific method
"myWriter::cbMethod ( vtkXXX * pDataInParaviewViewer )"
What is this method ?
Also, at this step, I export
PV_PLUGIN_PATH=/mnt/users/houssen/Documents/solve-rel/paraview. When I
run paraview and use the "save data" button I get this :
Generic Warning: In
/.../Programs/ParaView/ParaView-v4.3.1-source/ParaViewCore/ServerManager/Core/vtkSMWriterFactory.cxx,
line 135
writers : myWriter has no input property.
... But I have an <InputProperty> tag in the xml : what's wrong ?
Can somebody help me on this ?
Franck
Note : I run Ubuntu and paraview-4.3
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