[Paraview-developers] vtkSMTransferFunctionManager->GetColorTransferFunction

[Mathieu Westphal]

Yes indeed, this is how i was doing it before.
I'm also using the pqColorToolbar to allow the user
to change the colored data, and i catched the change of color with
colorChanged signal.

But since it have disappeared, i just can't know when i need to
override.

The use of vtkSMTransferFunctionManager is very much clearer now and i
appreciate that, but i don't fully understand this design.

What if i have two completelly unrelated dataset with the same array
name in it, for example, from VTKDATA :
ex-blow_5_0_..vtu
ex-blow_5.vtm

Both contain array with same.
If i display the vtu in a view, and the vtm in another view.
If a select the same colored array ( let's say THICKNESS ) on both
representation, clicking on "rescale to data range" with one view active
will also rescale it on the other view, on another completelly unrelated
dataset.

Would'nt it better if a TransferFunction is associated to a arrayName
AND a representation ?


But i'm not a paraview developper, and my application is not profundly
impacted by this problem, i only find this design not flawless.

Mathieu
On Thu, May 22, 2014 at 09:17:26AM -0400, Utkarsh Ayachit wrote:
> Yes, that's exactly what's expected in ParaView, by design. All arrays
> with the same name get the same color transfer function. If custom
> applications want to change they, they can override (using VTK's
> factory mechanisms) the vtkSMTransferFunctionManager.
> 
> Utkarsh
> 
> On Thu, May 22, 2014 at 7:35 AM, Mathieu Westphal
> <mathieu.westphal at gmail.com> wrote:
> > It seems to me this method associate an arrayName to a
> > ColorTransferFunction.
> >
> > It works well, but it appears that two array from completly different
> > dataset with the same name will be displayed with the exact same
> > ColorTransferFunction, including color, range and opacity.
> >
> > Is this normal ?
> >
> > Thanks
> >
> > Mathieu
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