[vtkusers] How to color cylinder with different colors

[Alex Malyushytskyy]

Or you can create 3 cylinders (1 for each color) on top of each other if
you want to follow your own approach.


On Tue, May 7, 2013 at 2:58 PM, Alex Malyushytskyy <alexmalvtk at gmail.com>wrote:

> Your cylinder source produces  polydata.
>
> Common ways to define color for polydata in vtk  for cells or nodes ( in
> your case you want cells )
> is either define color as rgb values in a char array:
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/TriangleSolidColor
>
> or as a value which later can be mapped using LookUp table:
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/ColorCells
>
> You will have to make sure your cylinder has at least 3 cells along the
> axis to obtain desired results.
>
> Alex
>
>
>
>
> On Mon, May 6, 2013 at 10:03 PM, Divya <divya at triassicsolutions.com>wrote:
>
>>  Dear All,
>>
>> I want to color a cylinder like the image attached. I have tried
>> combining 2 different cylinder source with different colors but I am
>> getting the following result
>>
>>
>>  Any help will be greatly appreciated.
>>
>> My source code is as follows:
>>
>> vtkCylinderSource catheter = vtkCylinderSource.New();
>>             catheter.SetRadius(1);
>>             catheter.SetHeight(15.0);
>>             catheter.Update();
>>             //catheter.CappingOn();
>>
>>             vtkFloatArray cylColor1 = vtkFloatArray.New();
>>             cylColor1.SetNumberOfComponents(3);
>>             cylColor1.SetName("Color1");
>>
>>             for (int i = 0; i < catheter.GetOutput().GetNumberOfPoints();
>> i++)
>>             {
>>                 cylColor1.InsertTuple3(i, 255, 0, 0);
>>             }
>>             catheter.GetOutput().GetPointData().SetScalars(cylColor1);
>>
>>             vtkCylinderSource catheter2 = vtkCylinderSource.New();
>>             catheter2.SetRadius(1);
>>             catheter2.SetHeight(10.0);
>>             catheter2.Update();
>>             //catheter2.CappingOn();
>>
>>             vtkFloatArray cylColor = vtkFloatArray.New();
>>             cylColor.SetNumberOfComponents(3);
>>             cylColor.SetName("Color2");
>>
>>             for (int i = 0; i <
>> catheter2.GetOutput().GetNumberOfPoints(); i++)
>>             {
>>                 cylColor.InsertTuple3(i, 0, 0, 255);
>>             }
>>             catheter2.GetOutput().GetPointData().SetScalars(cylColor);
>>
>>             // append both polydata sets
>>             vtkAppendPolyData apd = new vtkAppendPolyData();
>>             apd.AddInput(catheter.GetOutput());
>>             apd.AddInput(catheter2.GetOutput());
>>             apd.Update();
>>
>>             ////vtkCleanPolyData cleanFilter = vtkCleanPolyData.New();
>>             ////cleanFilter.SetInput(apd.GetOutput());
>>             ////cleanFilter.Update();
>>
>>             vtkPolyDataMapper catheterMapper = vtkPolyDataMapper.New();
>>             catheterMapper.SetInputConnection(apd.GetOutputPort());
>>             catheterActor.SetMapper(catheterMapper);
>>
>> --
>>
>>    Regards,
>> *DIVYA SADANANDAN
>> Software Engineer*
>> Triassic Solutions Pvt. Ltd.
>> (+91) 471 2700050 (Office)
>> 7736382699 (Mobile)  <http://www.triassicsolutions.com>
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