[Paraview] Threshold not working for unstructured grid

[Aleksejs Fomins]

Dear Paraview,

I am new to this list, so I would like to immediately apologise if my
style does not meet your standard.

I am learning to use Paraview, and I have problems using the threshold
filter. I have attached 2 .vtk files based on documentation examples to
explain my point

I use filters->common->threshold, then specify Scalars->cell_scalars
and choose range [1,3].

* For the "polydata.vtk" I observe some of the rectangles disappear as
expected. If I manipulate the range, I can get any one rectangle disappear.

* For the "unstructured.vtk" I see all but one triangle disappear, which
is unexpected. If I manipulate the range, either the tetrahedron
disappears altogether, or only one triangle is visible.

Could you please tell me what am I doing wrong?

----------------------------------------------------------------------
Paraview Version 4.1.0 64-bit
QT Version 4.8.2
Linux debian 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u1 x86_64 GNU/Linux
----------------------------------------------------------------------

Thank you,
Aleksejs Fomins
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# vtk DataFile Version 2.0
Cube example
ASCII
DATASET POLYDATA
POINTS 8 float
0.0 0.0 0.0
1.0 0.0 0.0
1.0 1.0 0.0
0.0 1.0 0.0
0.0 0.0 1.0
1.0 0.0 1.0
1.0 1.0 1.0
0.0 1.0 1.0
POLYGONS 6 30
4 0 1 2 3
4 4 5 6 7
4 0 1 5 4
4 2 3 7 6
4 0 4 7 3
4 1 2 6 5
CELL_DATA 6
SCALARS cell_scalars int 1
LOOKUP_TABLE default
0
1
2
3
4
5
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# vtk DataFile Version 2.0
Test Paraview Example
ASCII
DATASET UNSTRUCTURED_GRID
POINTS 4 float
0.0 0.0 0.0
1.0 0.0 0.0
0.0 1.0 0.0
0.0 0.0 1.0
CELLS 4 16
3 0 1 2
3 0 1 3
3 0 2 3
3 1 2 3
CELL_TYPES 4
5
5
5
5
CELL_DATA 4
SCALARS cell_scalars int 1
LOOKUP_TABLE default
0
1
2
3
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