[Paraview] How to extract a subdataset?

[Moreland, Kenneth]

Somehow I missed this original email.

I don't think BuildLinks is a good explanation here.  If you have removed 99 out of 100 cells, I can't imagine the output growing to take up twice as much memory just because links were built.  The clip filter will also tetrahedral your data, but that should only grow it by a factor of at most 6, not 200.

I assume you are using the Clip filter with Clip Type of Box.  Are you sure that the output contains the cells that are inside the box (the 1%) rather than outside the box (the 99%)?  By default, the clip filter will clip away everything inside the box and leave the rest.  To get only the cells in the box, you have to click on the Inside Out checkbox.  If you set the representation to Surface, do you get what you expect?  Does the cell count drop by a factor of 100?

BTW, using Extract Cells By Region was a good suggestion.  If you are just interested in extracting a group of cells, this filter should be more efficient and consume less memory.

-Ken


On 9/3/09 5:54 AM, "Paul Edwards" <paul.m.edwards at gmail.com> wrote:

I think this is the result of BuildLinks being called.

Regards,
Paul

2009/9/3 Fred Fred <stan1313 at hotmail.fr>
I mean without having the subset be more memory consumming than its including part!
I have an unstructured data set with 9 scalar data fields, which occupies 573 MB, I clip it with a very small box (less than 1% of the whole domain) and the resulting subset occupies 1,920 MB!! Nice!
So:
  1) how is it possible?
  2) how to clip an unstructured dataset with the expected resulting effect on the memory size?


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   ****      Kenneth Moreland
    ***      Sandia National Laboratories
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*** *** ***  email: kmorel at sandia.gov
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