[vtkusers] ThresholdPoints

[Kannan U V]

Hi,
I want to visualize different segments in a brain image. I have the
labels written as rectilineargrid file. I am able to see the surfaces
using a

rectilinearGridReader->contourFilter->polyDataMapper->actor.

Since I want to visualize individual regions, I want to threshold
based on the region label values to visualize only those individual
regions. But when I use thresholdPoints before the contour filter (I
am using the regionvalue-0.5 and regionvalue+0.5 as thresholds and
value for countourFilter is regionvalue-0.01) I don't get any
rendering or error. Am I doing something wrong or is there a better
way to design this pipeline?

Thanks,
Kannan