[Paraview] Plugin to modify the current transfer function

[Utkarsh Ayachit]

Joe,

In ParaView, one rarely directly changes the underlying VTK objects,
instead uses the Proxy API. You should stick with updating the
"RGBPoints" property on the lookup table proxy
(repr->getLookupTable()->getProxy()).

e.g.

vtkSMProxy* lutProxy = repr->getLookupTable()->getProxy();
helper(lutProxy, "RGBPoints");
double rgbPoints = {10, 0, 0, 0,
                             100, 0, 0, 0};
vtkSMPropertyHelper(lutProxy, "RGBPoints").Set(rgbPoints, 8);
lutProxy->UpdateVTKObjects();


Utkarsh

On Tue, Dec 3, 2013 at 3:33 PM, Joe Ping-Lin Hsiao <phsiao at cs.unc.edu> wrote:
> I figured it  out. What I need is
>
> GUI_SOURCES
>    ${UI_BUILT_SOURCES}
>
> in ADD_PARAVIEW_PLUGIN().
>
> However instead modifying the transfer function, what I actually what to do
> is editing the Scalar to Color map. I have
>
> pqDataRepresentation* repr =
> pqActiveObjects::instance().activeRepresentation();
>
> vtkColorTransferFunction *ctf =
> vtkColorTransferFunction::SafeDownCast(repr->getLookupTable()->getProxy()->GetClientSideObject());
> ctf->AddRGBPoint(10, 0, 0, 0);
> ctf->AddRGBPoint(100, 0, 0, 0);
>
> in my plugin's constructor, but when I open the transfer function editor
> after applying the plugin, there's no new point in the color map. There are
> just the two default color points. Am I missing something?
>
>
> On Wed, Nov 27, 2013 at 2:56 PM, Joe Ping-Lin Hsiao <phsiao at cs.unc.edu>
> wrote:
>>
>> Which libraries should I link to use pqActiveObjects? I tried
>> ${PARAVIEW_BUILD_SHARED_LIBS} but it doesn't work.
>>
>> Joe
>>
>>
>> On Sat, Nov 23, 2013 at 5:48 PM, Utkarsh Ayachit
>> <utkarsh.ayachit at kitware.com> wrote:
>>>
>>> Yes, you can indeed write a client-side plugin that updates the active
>>> opacity transfer function. Your plugin can monitor pqActiveObjects
>>> singleton to get access to the active representation and from that you
>>> can access it's ScalarOpacityFunction. Look at pqColorMapEditor and
>>> pqColorOpacityEditorWidget in ParaView 4.1.0 source to see how that
>>> could be done.
>>>
>>> Utkarsh
>>>
>>> On Fri, Nov 15, 2013 at 10:36 AM, Joe Ping-Lin Hsiao <phsiao at cs.unc.edu>
>>> wrote:
>>> > I want to modify the transfer function from my plugin, e.g. add and
>>> > delete
>>> > points.
>>> > In VTK, it would be calling vtkPiecewiseFunction->AddPoint(). Can I do
>>> > that
>>> > in Paraview?
>>> >
>>> > Thanks,
>>> > Joe
>>> >
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>>
>>
>