[mesh manipulation] Сombining stl surface meshes

Reptider · March 24, 2021, 10:36

Hello!
There are different stl files. Their surfaces are randomly refined. It's supposed they are connected, because created using step files (check union.png).
How can I unite them for getting a single external surface (single.png)?
I can't use boolean operations in Gmsh, because stl format isn't supported there.
If I simply add the start of second stl in first and then use cartesianMesh, I get problems at boundary.
Do utilites like stitchMesh or mergeMeshes may help? I have read about them, but i'm not sure, how they should be used.
Thanks!
union.png

nasa55 · March 25, 2021, 05:26

Quote:

Originally Posted by Reptider

Hello!
There are different stl files. Their surfaces are randomly refined. It's supposed they are connected, because created using step files (check union.png).
How can I unite them for getting a single external surface (single.png)?
I can't use boolean operations in Gmsh, because stl format isn't supported there.
If I simply add the start of second stl in first and then use cartesianMesh, I get problems at boundary.
Do utilites like stitchMesh or mergeMeshes may help? I have read about them, but i'm not sure, how they should be used.
Thanks!
Attachment 83508

I couldn't understand well. Would you like to merge the .stl files or the mesh created regarding those files? Second, wich meshing tool did you use to create the grids?

Reptider · March 31, 2021, 13:53

Quote:

Originally Posted by nasa55

I couldn't understand well. Would you like to merge the .stl files or the mesh created regarding those files? Second, wich meshing tool did you use to create the grids?

I know how to merge stl files. I think, I want to merge mesh. Grids are created by GMSH.

March 24, 2021, 10:36	Сombining stl surface meshes	#1
Reptider New Member Join Date: Sep 2020 Posts: 28 Rep Power: 5	Hello! There are different stl files. Their surfaces are randomly refined. It's supposed they are connected, because created using step files (check union.png). How can I unite them for getting a single external surface (single.png)? I can't use boolean operations in Gmsh, because stl format isn't supported there. If I simply add the start of second stl in first and then use cartesianMesh, I get problems at boundary. Do utilites like stitchMesh or mergeMeshes may help? I have read about them, but i'm not sure, how they should be used. Thanks! union.png

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