# Separate mesh surfaces in VTU results

**URL:** https://discourse.paraview.org/t/separate-mesh-surfaces-in-vtu-results/16699
**Category:** ParaView Support
**Tags:** vtk
**Created:** [May 23, 2025, 12:51pm UTC](https://discourse.paraview.org/t/separate-mesh-surfaces-in-vtu-results/16699 "2025-05-23T12:51:49Z")
**Posts on this page:** 8
**Page:** 1

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### Author: ![AlexS](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/a/2acd7d/32.png) [@AlexS](https://discourse.paraview.org/u/AlexS)
#### Post date: [May 23, 2025, 12:51pm UTC](https://discourse.paraview.org/t/separate-mesh-surfaces-in-vtu-results/16699/1 "2025-05-23T12:51:50Z")

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Hello there,

I’m running ICFD analysis on LS-DYNA with VTK or VTU output for Paraview.

Problem is, when i load the results in Paraview i cannot seperate my different surfaces (to plot the shear stress per part for example).

I’d like to know if there is a way to seperate each surfaces please. I already tried the multi block inspection, it returned this error :

ERROR: In vtkExtractBlockUsingDataAssembly.cxx, line 222  
vtkExtractBlockUsingDataAssembly (00000203ACE78ED0): Input is missing.

ERROR: In vtkExecutive.cxx, line 730  
vtkPVCompositeDataPipeline (00000203AEC545B0): Algorithm vtkExtractBlockUsingDataAssembly (00000203ACE78ED0) returned failure for request: vtkInformation (00000203AD67B470)  
Debug: Off  
Modified Time: 1238958  
Reference Count: 1  
Registered Events: (none)  
Request: REQUEST\_DATA\_OBJECT  
FORWARD\_DIRECTION: 0  
ALGORITHM\_AFTER\_FORWARD: 1  
FROM\_OUTPUT\_PORT: 0

ERROR: In vtkExtractBlockUsingDataAssembly.cxx, line 222  
vtkExtractBlockUsingDataAssembly (00000203ACE78ED0): Input is missing.

ERROR: In vtkExecutive.cxx, line 730  
vtkPVCompositeDataPipeline (00000203AEC545B0): Algorithm vtkExtractBlockUsingDataAssembly (00000203ACE78ED0) returned failure for request: vtkInformation (00000203AD67B470)  
Debug: Off  
Modified Time: 1238958  
Reference Count: 1  
Registered Events: (none)  
Request: REQUEST\_DATA\_OBJECT  
FORWARD\_DIRECTION: 0  
ALGORITHM\_AFTER\_FORWARD: 1  
FROM\_OUTPUT\_PORT: 0

Thank you in advance for your answers.

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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: [May 23, 2025, 12:53pm UTC](https://discourse.paraview.org/t/separate-mesh-surfaces-in-vtu-results/16699/2 "2025-05-23T12:53:31Z")

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please share your data

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<div class="post-metadata">

### Author: ![AlexS](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/a/2acd7d/32.png) [@AlexS](https://discourse.paraview.org/u/AlexS)
#### Post date: [May 23, 2025, 1:02pm UTC](https://discourse.paraview.org/t/separate-mesh-surfaces-in-vtu-results/16699/3 "2025-05-23T13:02:24Z")

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You can access the results with this link : [https://wetransfer.com/downloads/4965ade417abc54aa2bb30d02ec84e3920250523130120/af83fd631575f8744391a6abd7520ce620250523130121/a54c36?t\_exp=1748264481&t\_lsid=068d4e36-7abb-4a0e-86ed-8894163c4370&t\_network=email&t\_rid=Z29vZ2xlLW9hdXRoMnwxMDIxNzA4NjUyNTQyOTIxNzI3OTA=&t\_s=download\_link&t\_ts=1748005281](https://wetransfer.com/downloads/4965ade417abc54aa2bb30d02ec84e3920250523130120/af83fd631575f8744391a6abd7520ce620250523130121/a54c36?t_exp=1748264481&t_lsid=068d4e36-7abb-4a0e-86ed-8894163c4370&t_network=email&t_rid=Z29vZ2xlLW9hdXRoMnwxMDIxNzA4NjUyNTQyOTIxNzI3OTA%3D&t_s=download_link&t_ts=1748005281&utm_campaign=TRN_TDL_01&utm_source=sendgrid&utm_medium=email&trk=TRN_TDL_01)

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<div class="post-metadata">

### 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: [May 23, 2025, 1:29pm UTC](https://discourse.paraview.org/t/separate-mesh-surfaces-in-vtu-results/16699/4 "2025-05-23T13:29:29Z")

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Your data open fine in ParaView. What do you mean by “a way to seperate each surfaces” ?

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<div class="post-metadata">

### Author: ![AlexS](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/a/2acd7d/32.png) [@AlexS](https://discourse.paraview.org/u/AlexS)
#### Post date: [May 23, 2025, 1:32pm UTC](https://discourse.paraview.org/t/separate-mesh-surfaces-in-vtu-results/16699/5 "2025-05-23T13:32:16Z")

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In reality, there are several surfaces in the model (see attached picture)

 ![part2](https://discourse.paraview.org/uploads/default/original/3X/f/e/feb86ab00948625dd7fd70105f6a0a11958fe7b6.png)

I would like to have them displayed in Paraview to plot the surface shear on the smaller cylinder

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<div class="post-metadata">

### Author: ![AlexS](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/a/2acd7d/32.png) [@AlexS](https://discourse.paraview.org/u/AlexS)
#### Post date: [May 23, 2025, 1:34pm UTC](https://discourse.paraview.org/t/separate-mesh-surfaces-in-vtu-results/16699/6 "2025-05-23T13:34:46Z")

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It seems that i just have access to the volume plot and not the surface plot in ParaView

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<div class="post-metadata">

### 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: [May 23, 2025, 1:40pm UTC](https://discourse.paraview.org/t/separate-mesh-surfaces-in-vtu-results/16699/7 "2025-05-23T13:40:25Z")

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Well, this is what is contained in the file you shared. It does not contains the surface. You may want to check if the surfaces can be exported from LS-DYNA

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<div class="post-metadata">

### Author: ![AlexS](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/a/2acd7d/32.png) [@AlexS](https://discourse.paraview.org/u/AlexS)
#### Post date: [May 23, 2025, 2:12pm UTC](https://discourse.paraview.org/t/separate-mesh-surfaces-in-vtu-results/16699/8 "2025-05-23T14:12:00Z")

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All right then, i will ask this to the LS-PrePost developpers, thank you.