[vtkusers] visualizing regular grid with nearest neighbour (lack of) interpolation

[Jesper J. Henriksen]

Hi,
 
Im trying to visualize a grid of datapoints , and have been unble to
disable the liniear intrpolation of the color values.
 
The grid of points is generated using the chain: vtkActor ->
pvtkPolyDataMapper -> pvtkProbeFilter -> pvtkPlaneSource ->
pvtkDelaunay2D -> pvtkPolyData.
Where the polydata points are placed in a rectangular grid, and set in
the following manner:
pvtkPolyData->SetPoints(pvtkPoints);

pvtkPolyData->GetPointData()->SetScalars(pvtkFloatArray);

pvtkPolyData->SetVerts(pvtkCellArray);

setting the SetInterpolationToFlat() on the actor does not have the
desired effect.
neither does InterpolateScalarsBeforeMappingOff on the
pvtkPolyDataMapper.
 
Is it possible to do a nearest neighbour lookup of the values?
 
Best regards
Jesper
 
 
 
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