# Extract Block Filter: Extract Single DataSet not MultiBlockDataSet

**URL:** https://discourse.paraview.org/t/extract-block-filter-extract-single-dataset-not-multiblockdataset/1341
**Category:** ParaView Support
**Created:** [February 22, 2019, 7:20pm UTC](https://discourse.paraview.org/t/extract-block-filter-extract-single-dataset-not-multiblockdataset/1341 "2019-02-22T19:20:31Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![banesullivan](https://discourse.paraview.org/user_avatar/discourse.paraview.org/banesullivan/32/11714_2.png) [@banesullivan](https://discourse.paraview.org/u/banesullivan)
#### Post date: [February 22, 2019, 7:20pm UTC](https://discourse.paraview.org/t/extract-block-filter-extract-single-dataset-not-multiblockdataset/1341/1 "2019-02-22T19:20:31Z")

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Is there a way to extract a single block from a multi-block dataset using the _Extract Block_ filter?

Whenever I use the _Extract Block_ filter, it returns a multi-block dataset but I need to apply filters that cannot handle multi-block datasets.

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### Author: ![Andy\_Bauer](https://discourse.paraview.org/user_avatar/discourse.paraview.org/andy_bauer/32/5442_2.png) [@Andy\_Bauer](https://discourse.paraview.org/u/Andy_Bauer)
#### Post date: [February 22, 2019, 8:02pm UTC](https://discourse.paraview.org/t/extract-block-filter-extract-single-dataset-not-multiblockdataset/1341/2 "2019-02-22T20:02:22Z")

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I think the best you can do right now is to use the `Extract Block` filter to get the block you want and then use a `Merge Blocks` filter to make that into a single unstructured grid. Otherwise, a `Programmable Filter` is probably your best bet to do the extraction in a single shot.

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [March 4, 2019, 11:02am UTC](https://discourse.paraview.org/t/extract-block-filter-extract-single-dataset-not-multiblockdataset/1341/3 "2019-03-04T11:02:13Z")

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We shoud modify ExtractBlock to actually extract the block when a single block is selected.

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### Author: ![wascott](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/w/8e8cbc/32.png) [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [March 4, 2019, 6:09pm UTC](https://discourse.paraview.org/t/extract-block-filter-extract-single-dataset-not-multiblockdataset/1341/4 "2019-03-04T18:09:14Z")

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[https://gitlab.kitware.com/paraview/paraview/issues/18834](https://gitlab.kitware.com/paraview/paraview/issues/18834).

Andy, want to add your tag to it?