[vtkusers] Color a vtkcell

[Francois Bertel]

Just include vtkCellData.h:

http://www.vtk.org/Wiki/VTK_FAQ#The_C.2B.2B_compiler_cannot_convert_some_pointer_type_to_another_pointer_type_in_my_little_program

On Tue, Jan 12, 2010 at 7:21 PM, awabi <aw.ndaw at gmail.com> wrote:
>
> I try to use your solution but,
> 4) PolyData->GetCellData()->SetScalars(colors)  is not accepted I have this
> error:
>
>  error: invalid use of incomplete type ‘struct vtkCellData’
> /usr/sbin/../include/vtk-5.0/vtkDataSet.h:43: error: forward declaration of
> ‘struct vtkCellData’
>
> However when I replace the dtkCellData with a vtkPointData i haven't any
> error.
>
> Thanks,
>
> Awa,
>
>
> David Gobbi-3 wrote:
>>
>> No, the CellArray is for something else.  The best way is with RGB
>> scalars:
>>
>> vtkUnsignedCharArray *faceColors = vtkUnsignedCharArray::New();
>> faceColors->SetNumberOfComponents(3);
>> faceColors->InsertNextTuple(r1, b1, g1);
>> faceColors->InsertNextTuple(r2, b2, g2);
>>
>> Etcetera, until you have six colors.  Use values between 0 and 255 for r,
>> g, b.
>>
>> Next is the tricky part.  I don't think that VTK has a pipeline filter
>> that allows you to add these scalars (except for the programmable
>> filters) so the easiest way to add the colors is like this:
>>
>> 1) make a vtkCubeSource
>> 2) make a vtkPolyData
>> 3) DeepCopy the output of the CubeSource into the PolyData
>> 4) do PolyData->GetCellData()->SetScalars(colors) as Darshan said
>>
>> Does anyone know if there is a VTK filter that can add field data or
>> attribute data to a dataset, so that these sorts of DeepCopy tricks
>> aren't necessary?
>>
>>    David
>>
>>
>> On Tue, Jan 12, 2010 at 3:27 PM, awabi <aw.ndaw at gmail.com> wrote:
>>>
>>> Thank you.
>>>
>>> Is it possible via a vtkcellarray?
>>>
>>> awa.
>>>
>>> dpai wrote:
>>>>
>>>> Yes you can
>>>>
>>>> Add Attributes as follows PolyData->GetCellData()->SetScalars()
>>>> and put a lookupTable with the required colors
>>>>
>>>> On Tue, Jan 12, 2010 at 5:03 PM, awabi <aw.ndaw at gmail.com> wrote:
>>>>
>>>>>
>>>>> Hello,
>>>>>
>>>>> I'd like to know if it is possible with vtk to color the faces of a
>>>>> vtkpolydata as I want. For example I have a cube and I'd like to color
>>>>> the
>>>>> faces differently.
>>>>>
>>>>> Thank you,
>>>>>
>>>>> Awa
>>>>> --
>>>>> View this message in context:
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>>>>> Sent from the VTK - Users mailing list archive at Nabble.com.
>>>>>
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>>>
>>> --
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>>>
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>>> Visit other Kitware open-source projects at
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>> _______________________________________________
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>
> --
> View this message in context: http://old.nabble.com/Color-a-vtkcell-tp27135594p27137548.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>
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François Bertel, PhD  | Kitware Inc. Suite 204
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