[vtkusers] coloring PolyDataMappers in python

[Tudor Achim]

Thanks for the pointers - your suggestions worked. On a related note, is
there some trick to getting shading to work? Right now the colors are super
intense and it's tough to tell the contour of the solids.

[image: Inline image 1]

On Tue, Aug 4, 2015 at 2:29 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> Don't forget that use of SetColor() often requires this:
>
>   mapper.ScalarVisibilityOff()
>
> SetColor() is ignored if scalars are present and visible.
>
>  - David
>
>
> On Tue, Aug 4, 2015 at 12:24 PM, Cory Quammen <cory.quammen at kitware.com>
> wrote:
>
>> In that case, you can leave out the vtkLookupTable altogether and set the
>> color in your actor instead
>>
>> actor = vtk.vtkActor()
>> actor.SetMapper(mapper)
>> property = actor.GetProperty()
>> property.SetColor(*rgb_cluster_mapping[cluster_ind])
>>
>> HTH,
>> Cory
>>
>> On Tue, Aug 4, 2015 at 2:15 PM, Tudor Achim <tachim at cs.stanford.edu>
>> wrote:
>>
>>> No, I'd like the entire mesh to be one color (and opacity).
>>>
>>> On Tue, Aug 4, 2015 at 2:04 PM, Cory Quammen <cory.quammen at kitware.com>
>>> wrote:
>>>
>>>> Are you trying to color map a particular data array in the contour?
>>>>
>>>> On Mon, Aug 3, 2015 at 3:43 PM, Tudor Achim <tachim at cs.stanford.edu>
>>>> wrote:
>>>>
>>>>> Hi all,
>>>>> I have a quick question about coloring vtkPolyMappers. I have the
>>>>> following code:
>>>>>
>>>>> for cluster_ind in ...:
>>>>> threshold = vtk.vtkImageThreshold()
>>>>> threshold.SetInputConnection(importer.GetOutputPort())
>>>>> threshold.ThresholdBetween(cluster_ind-0.1, cluster_ind+0.1)
>>>>> threshold.ReplaceInOn()
>>>>> threshold.SetInValue(0)
>>>>> threshold.ReplaceOutOn()
>>>>> threshold.SetOutValue(1)
>>>>> threshold.Update()
>>>>>
>>>>> dmc = vtk.vtkDiscreteMarchingCubes()
>>>>> dmc.SetInputConnection(threshold.GetOutputPort())
>>>>> dmc.GenerateValues(1, 1, 1)
>>>>> dmc.Update()
>>>>>
>>>>> mapper = vtk.vtkPolyDataMapper()
>>>>> mapper.SetInputConnection(dmc.GetOutputPort())
>>>>>
>>>>> lut = vtk.vtkLookupTable()
>>>>> lut.SetNumberOfTableValues(2)
>>>>> lut.SetTableValue(0, 0, 0, 255)
>>>>> lut.SetTableValue(1, *rgb_cluster_mapping[cluster_ind])
>>>>> lut.Build()
>>>>> mapper.SetLookupTable(lut)
>>>>> mapper.SetScalarModeToUseCellData()
>>>>>
>>>>> However, when I run it only one of the mappers is colored correctly;
>>>>> the other one is just rendered as black. I can tell that it's rendered
>>>>> black because when I spin around the clusters in my viewer I can see it
>>>>> obstructing the other clusters. The intended colors are (0, 255, 0) and
>>>>> (88, 86, 214) (that's what's in rgb_cluster_mapping for these clusters).
>>>>>
>>>>> Any ideas?
>>>>>
>>>>
>
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