Issue compiling custom reader plugin with accompanying VTK reader

Development
1

Hey guys,

I’m currently trying to create a reader for the JSON based CityJSON format (mix of CityGML and GeoJSON (www.cityjson.org)).

As far as I understand I will need to create a new VTK reader to accompany the ParaView plugin, so I’m using the ElevationFilter as an example. Running into a few issues however, so was hoping someone could help:

When I try to compile I run into the following error:

In file included from /mnt/hdd/Repositories/Paraview-CityJSONReader/Plugin/CityJSONReaders/vtkMyCityJSONReader.cxx:1:
/mnt/hdd/Repositories/Paraview-CityJSONReader/Plugin/CityJSONReaders/vtkMyCityJSONReader.h:6:49: error: expected initializer before ‘:’ token
    6 | class CITYJSONREADER_EXPORT vtkMyCityJSONReader : public vtkPolyData
      |

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The code I have so far is:
vtkMyCityJSONReader.cxx

#include "vtkMyCityJSONReader.h"

#include "vtkObjectFactory.h"

vtkStandardNewMacro(vtkMyCityJSONReader);

//----------------------------------------------------------------------------
vtkMyCityJSONReader::vtkMyCityJSONReader()
{
}

//----------------------------------------------------------------------------
vtkMyCityJSONReader::~vtkMyCityJSONReader()
{
}

//----------------------------------------------------------------------------
void vtkMyCityJSONReader::PrintSelf(ostream& os, vtkIndent indent)
{
    this->Superclass::PrintSelf(os, indent);
}

vtkMyCityJSONReader.h

#ifndef vtkMyCityJSONReader_h
#define vtkMyCityJSONReader_h

#include "vtkPolyData.h"

class CITYJSONREADER_EXPORT vtkMyCityJSONReader : public vtkPolyData
{
public:
    static vtkMyCityJSONReader* New();
    vtkTypeMacro(vtkMyCityJSONReader, vtkPolyData);
    void PrintSelf(ostream& os, vtkIndent indent) override;

protected:
    vtkMyCityJSONReader();
    ~vtkMyCityJSONReader();

private:
    vtkMyCityJSONReader(const vtkMyCityJSONReader&) = delete;
    void operator=(const vtkMyCityJSONReader&) = delete;
};

#endif

CMakeLists.txt

cmake_minimum_required(VERSION 3.8)
project(CityJSONReader)

find_package(ParaView REQUIRED)

option(BUILD_SHARED_LIBS "Build shared libraries" ON)
enable_testing()

# Required for python testing
set(_vtk_build_TEST_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/Testing/Temporary)

include(GNUInstallDirs)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR}")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR}")
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR}")

set("_paraview_plugin_default_${CMAKE_PROJECT_NAME}" ON)
paraview_plugin_scan(
        PLUGIN_FILES      "${CMAKE_CURRENT_SOURCE_DIR}/Plugin/paraview.plugin"
        PROVIDES_PLUGINS  plugins
        REQUIRES_MODULES  required_modules)

foreach (module IN LISTS required_modules)
    if (NOT TARGET "${module}")
        message(#FATAL_ERROR
                "Skipping example ${CMAKE_PROJECT_NAME}: Missing required module: "
                "${module}")
        return ()
    endif ()
endforeach ()

paraview_plugin_build(
        RUNTIME_DESTINATION "${CMAKE_INSTALL_BINDIR}"
        LIBRARY_DESTINATION "${CMAKE_INSTALL_LIBDIR}"
        LIBRARY_SUBDIRECTORY "${PARAVIEW_PLUGIN_SUBDIR}"
        PLUGINS ${plugins})
2

I would take a look at the CityGML reader
https://blog.kitware.com/citygml-reader/
and integrate it in ParaView the same way first. When you get that working, you can make the code a ParaView plugin as a separate step.

3

#include "YourModuleName.h" // for export macro

is missing.

4

Thanks Mathieu, I was just wondering what ‘YourModuleName’ is going to end up being, because in the examples I see “vtkIOGeoJSONModule” for the module “vtkGeoJSONReader”, but am unable to actually find the header file that is being referenced. How is this include chosen?

5

it is coming from the vtk.module file alongside your vtkMyCityJSONReader.cxx.

6

Great, thanks Mathieu, I have a module that’s compiling now, so that’s awesome

Must be a few hurdles still on the way, but at least this brings me some steps closer!

1 Like