[vtkusers] coloring PolyDataMappers in python

[Cory Quammen]

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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-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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