# Question about displaying result with paraview
**URL:** https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555
**Category:** Development
**Created:** [February 12, 2020, 3:06pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555 "2020-02-12T15:06:55Z")
**Posts on this page:** 17
**Page:** 1
### Author:  [@lainegates](https://discourse.paraview.org/u/lainegates)
#### Post date: [February 12, 2020, 3:06pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/1 "2020-02-12T15:06:55Z")
Hi, guys.
I am developing a numerical simulation algorithm.
The elements in it is not grid mesh, but distinct elements ( each element use a poly data).
With some big cases, there will be many elements.
And I want to toggle visibilities of each element.
I am now outputing data to disk by format PVD together with VTP.
The visualization works great, but I cannot toggle visibilties of each element.
Then, could anyone give me a hint ?
For example, what format I should output to support toggling visibilities of each element.
Or, paraview already support this, Where could I found it?
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### Author:  [@utkarsh.ayachit](https://discourse.paraview.org/u/utkarsh.ayachit)
#### Post date: [February 12, 2020, 3:10pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/2 "2020-02-12T15:10:54Z")
One option, if I am understanding this correctly, is to use a VTM instead of PVD. That way, you can make each polydata a separate block. Then you can use the [Multiblock Inspector](https://blog.kitware.com/upgrades-to-the-multiblock-inspector/) to toggle individual blocks.
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### Author:  [@lainegates](https://discourse.paraview.org/u/lainegates)
#### Post date: [February 12, 2020, 3:36pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/3 "2020-02-12T15:36:21Z")
Thanks,
Where could found introduction of format .vtm ?
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [February 13, 2020, 2:05am UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/4 "2020-02-13T02:05:32Z")
It is not documented yet :
[https://gitlab.kitware.com/vtk/vtk/issues/17675](https://gitlab.kitware.com/vtk/vtk/issues/17675)
But the format is quite self explanatory, here is an example :
[test.vtm](https://discourse.paraview.org/uploads/short-url/8mkmqt7l8H0XIGZmTdjFPFCNhty.vtm) (261 Bytes)
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### Author:  [@lainegates](https://discourse.paraview.org/u/lainegates)
#### Post date: [February 13, 2020, 3:36am UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/5 "2020-02-13T03:36:17Z")
```
```
Hi, tried the format, but paraview told me
```
ERROR: In e:\bbd\ecd3383f\build\superbuild\paraview\src\VTK\IO\XML\vtkXMLMultiBlockDataReader.cxx, line 317 vtkXMLMultiBlockDataReader (0000025809FB1DA0): Syntax error in file.
```
My paraview is version 5.6-vs2015
Should I change data format of .vtp ?
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [February 13, 2020, 3:37am UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/6 "2020-02-13T03:37:45Z")
can you share Step0.vtp and Step1.vtp ?
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### Author:  [@lainegates](https://discourse.paraview.org/u/lainegates)
#### Post date: [February 13, 2020, 11:44am UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/7 "2020-02-13T11:44:45Z")
of course.
[Step0.vtp](https://discourse.paraview.org/uploads/short-url/viFibIrckJdsV77BokcTMrRle2z.vtp) (12.7 KB) [Step1.vtp](https://discourse.paraview.org/uploads/short-url/52jw328H0EWyzO3cZEaduqR3ILX.vtp) (12.8 KB)
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### Author:  [@aron.helser](https://discourse.paraview.org/u/aron.helser)
#### Post date: [February 13, 2020, 2:44pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/8 "2020-02-13T14:44:54Z")
Did you remember your closing XML tag?
``
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### Author:  [@lainegates](https://discourse.paraview.org/u/lainegates)
#### Post date: [February 13, 2020, 2:57pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/9 "2020-02-13T14:57:36Z")
I am sorry, I forgot to copy the end XML tag ``.
But with the end tag, the error still exists.
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### Author:  [@aron.helser](https://discourse.paraview.org/u/aron.helser)
#### Post date: [February 13, 2020, 4:49pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/10 "2020-02-13T16:49:49Z")
You have a mistake in your capitalization:
Dataset -\> DataSet
This file works. The error message could be more informative 🙂
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### Author:  [@lainegates](https://discourse.paraview.org/u/lainegates)
#### Post date: [February 14, 2020, 2:44am UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/11 "2020-02-14T02:44:18Z")
Oh, My fault.
I changed to `DataSet`，it works !!!
But Another problem appears. Every time I select an element from “Multi-Block Inspector”, all elements will be colored once. The snapshot.
Did I output .VTP file with wrong format ?
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### Author:  [@lainegates](https://discourse.paraview.org/u/lainegates)
#### Post date: [February 27, 2020, 12:24pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/12 "2020-02-27T12:24:30Z")
Could anyone help me ?
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [February 27, 2020, 12:25pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/13 "2020-02-27T12:25:24Z")
What is your question ?
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### Author:  [@lainegates](https://discourse.paraview.org/u/lainegates)
#### Post date: [February 27, 2020, 12:28pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/14 "2020-02-27T12:28:40Z")
replace \*.pvd file with \*.vtm file .
The “multi-block inspector” works.
But every element in “multi-block inspector” colors all polydata.
When I turn on 4 elements in “multi-block inspector”, all polydata are colored for 4 times.
Just see the picture above.
Does I write \*.vtp file with wrong format ?
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### Author:  [@lainegates](https://discourse.paraview.org/u/lainegates)
#### Post date: [February 27, 2020, 12:30pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/15 "2020-02-27T12:30:12Z")
Or the \*.vtm treat each in it as one polydata ?
In other words, \*.vtm DOES NOT support time-step (like \*.pvd) ?
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [February 27, 2020, 12:31pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/16 "2020-02-27T12:31:46Z")
> [@lainegates](#):
>
> \*.vtm DOES NOT support time-step (like \*.pvd) ?
Not like .pvd no. Only as a time series.
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### Author:  [@lainegates](https://discourse.paraview.org/u/lainegates)
#### Post date: [February 27, 2020, 12:33pm UTC](https://discourse.paraview.org/t/question-about-displaying-result-with-paraview/3555/17 "2020-02-27T12:33:22Z")
thanks