[Paraview-developers] Question about SubProxy

[David Lawrie]

Hi All,

I am trying to create a simple filter that uses the SubProxy approach as  a learning exercise as I believe it will be useful in  a more complex filter I will need to create later.

Currently I am trying to create a filter which has a Contour sub-filter, exposes a couple of the properties then runs the contour filter using the user set values.

In my XML I have the following subproxy block

      <SubProxy>
        <Proxy name="ContourProxy" proxygroup="filters" proxyname="Contour" />
        <ExposedProperties>
          <Property name="SelectInputScalars" />
          <Property name="ComputeNormals" />

        </ExposedProperties>
      </SubProxy>

In my filter header I have included the following lines to provide storage for the sub-proxy and my constructor sets it to NULL at creation.

vtkSetObjectMacro(ContourProxy, vtkPVContourFilter);
vtkPVContourFilter* ContourProxy;

So far so good, the gui does have the elements which are exposed, however the drop down box is empty and as far as I can tell the ContourProxy variable remains NULL. Presumably I have to create the vtkPVContourFilter object somewhere, however I am unsure as to how/where.

Can anyone provide some guidance on what steps I am missing?

Thanks.

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