[Paraview] Extract unstructured grid

[Dimitrios Kiousis]

Hello ParaView users,

I am (used to be) a MayaVi user for quite some time now.
Recently however, I discovered ParaView and I think that it is considerably
better. I particularly enjoy the Clip option that was not available in
MayaVi1.

My question is as follows:
I run my FE computations and export unstructured_grid VTK files. Everything
looks ok except that I cannot extract part of the grid. For example,
elements 51-105. Which filter and how should I use? I should mention that
the "Extract Subset" filter is DISABLED. In MayaVi there was the Filter
"ExtractUnstructuredGrid" that would do the job, but I can't find anything
similar here.

Thanks for any help in advance,
dqdev

ps. My VTK file has the following form:

# vtk DataFile Version 3.0
Adventitia example:     0.01209
ASCII
DATASET UNSTRUCTURED_GRID
POINTS    4284  FLOAT
   1.50000   -5.00000   -0.25000
   1.44729   -4.76140   -0.23984
   1.31713   -4.77895   -0.22776
   1.35000   -5.00000   -0.25000
   .....................
   .....................
CELLS   3000  27000
  8      0      1      2      3      4      5      6      7
  8      1      8      9      2      5     10     11      6
  8      8     12     13      9     10     14     15     11
  ......................
  ......................
CELL_TYPES   3000
12
12
12
12
........
........
POINT_DATA   4284
VECTORS  DISPL  float
   0.00000    0.00000    0.00000
  -0.05271    0.03860    0.01016
  -0.03287    0.02105    0.02224
   0.00000    0.00000    0.00000
   0.00000    0.00000    0.00000
   ........................
   ........................
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