[Paraview] what is pkdtree, and why is it so slow?

[W. Bryan Smith]

hi,

i have a vtk file loaded into paraview3, and i have made an
isosurface rendering.  when i want to select the vtk object
in the pipeline browser (because, for example, i want to try
and draw another surface with a different isovalue), i see
this pkdtree thing show up in the progress bar, and it takes
a long time (10s of seconds) just to reset all the controls
(object inspector, etc) to reflect that i have selected the vtk
source rather than the contour.

bryan
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