# Shock: Switched from UnstructuredGrid to MultiblockDataset, fields disappeared

**URL:** https://discourse.vtk.org/t/shock-switched-from-unstructuredgrid-to-multiblockdataset-fields-disappeared/14933
**Category:** Development
**Created:** [November 29, 2024, 6:45am UTC](https://discourse.vtk.org/t/shock-switched-from-unstructuredgrid-to-multiblockdataset-fields-disappeared/14933 "2024-11-29T06:45:33Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Northern\_Condor1](https://discourse.vtk.org/user_avatar/discourse.vtk.org/northern_condor1/32/9062_2.png) [@Northern\_Condor1](https://discourse.vtk.org/u/Northern_Condor1)
#### Post date: [November 29, 2024, 6:45am UTC](https://discourse.vtk.org/t/shock-switched-from-unstructuredgrid-to-multiblockdataset-fields-disappeared/14933/1 "2024-11-29T06:45:33Z")

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Hello dear VTK developers!

Could you please explain me the following:

1. before today, I was using vtkDataSetAlgorithm with UnstructuredGrid. And after the empty stage the empty data objects seemed to have contained fields, which I used in custom widgets

2. today I used MultiblockDataset, however, it seems there is a problem: it does not contain any leaves with Data Objects, since it’s empty. So I cant get an access to the fields of the blocks from my custom widgets

Help me please and thanks You a lot!