[Technical] Mesh generation from dirty surface meshes

bastil · December 9, 2007, 17:41

Hi all,

I want to collect some ideas about my aim to run a case from which I only have dirty surface meshes. I do not have any geometry. Surface meshes represents geometry perfectly, however have free edges, overlappings,... From a commercial point of view this is good for surface wrapping or a tool like Harpoon. However, I want to use free software. Any ideas?
Gmsh could be possible: maybe convert into volumes and group them, mesh afterwards. However I do not know how to do. What oter ideas?

hsieh · December 9, 2007, 22:19

Hi,

Without knowing the details of your mesh, you can try tetgen. It can take surface mesh and generate a volume mesh from it.

pei

benru · December 10, 2007, 04:35

Or you can try SALOME www.salome-platform.org

bastil · December 10, 2007, 06:46

Hi,

both tools as far as I know have the disadvantage that surface mesh has to be absolutely clean (no interesections, free edges,...) My surface mesh is dirty. I need to repair this e.g. by wrapping or performing boolean operations on surfacemesh not on geometry (!) or I need to reconstruct geometry...

dmoroian · December 10, 2007, 06:53

Hm, to perform CAD cleaning as a prestep towards meshing.... that's tough. One tool would be ANSA, another Gambit, but both are commercial so... not good for you.
I saw that Blender is able to read iges file formats. I think it has boolean operations with different primitives, but when I asked on their discussion list if it is appropriate to use it as CAD clean software.... I got no answer (at least until now).

Dragos

bastil · December 10, 2007, 08:29

Hi,

please read my requirements carefully: I do not have geometry, only dirty (intersecting, free edges,...) surface meshes from which I need to start volume meshing. Maybe one way would be to do geometry cleanup, however: Therefore a surface reconstruction is essential first.

dmoroian · December 10, 2007, 11:31

Sorry, my bad!
But still those above should help you since they are able to read stl file formats too, and work with them.

Dragos

bastil · December 10, 2007, 11:34

So Tetgen and Salome can perform boolean operations on surface meshes or do surface reconstruction? That are really good news...

tog · December 10, 2007, 11:48

You can also have a look to jcae (http://jcae.sf.net)

bastil · December 10, 2007, 12:17

jcae does not seem to be able to do boolean operations on meshes or surface reconstruction, does it?

December 9, 2007, 17:41	Mesh generation from dirty surface meshes	#1
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 530 Rep Power: 20	Hi all, I want to collect some ideas about my aim to run a case from which I only have dirty surface meshes. I do not have any geometry. Surface meshes represents geometry perfectly, however have free edges, overlappings,... From a commercial point of view this is good for surface wrapping or a tool like Harpoon. However, I want to use free software. Any ideas? Gmsh could be possible: maybe convert into volumes and group them, mesh afterwards. However I do not know how to do. What oter ideas?

December 9, 2007, 22:19	Hi, Without knowing the det	#2
hsieh Senior Member Pei-Ying Hsieh Join Date: Mar 2009 Posts: 317 Rep Power: 18	Hi, Without knowing the details of your mesh, you can try tetgen. It can take surface mesh and generate a volume mesh from it. pei

December 10, 2007, 04:35	Or you can try SALOME www.salo	#3
benru Member Ruben I. Mukhamadeev Join Date: Mar 2009 Location: Obninsk, Kaluga reg., Russian Federation Posts: 69 Rep Power: 17	Or you can try SALOME www.salome-platform.org

December 10, 2007, 06:46	Hi, both tools as far as I	#4
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 530 Rep Power: 20	Hi, both tools as far as I know have the disadvantage that surface mesh has to be absolutely clean (no interesections, free edges,...) My surface mesh is dirty. I need to repair this e.g. by wrapping or performing boolean operations on surfacemesh not on geometry (!) or I need to reconstruct geometry...

December 10, 2007, 06:53	Hm, to perform CAD cleaning as	#5
dmoroian Senior Member Dragos Join Date: Mar 2009 Posts: 648 Rep Power: 20	Hm, to perform CAD cleaning as a prestep towards meshing.... that's tough. One tool would be ANSA, another Gambit, but both are commercial so... not good for you. I saw that Blender is able to read iges file formats. I think it has boolean operations with different primitives, but when I asked on their discussion list if it is appropriate to use it as CAD clean software.... I got no answer (at least until now). Dragos

December 10, 2007, 08:29	Hi, please read my requirem	#6
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 530 Rep Power: 20	Hi, please read my requirements carefully: I do not have geometry, only dirty (intersecting, free edges,...) surface meshes from which I need to start volume meshing. Maybe one way would be to do geometry cleanup, however: Therefore a surface reconstruction is essential first.

December 10, 2007, 11:31	Sorry, my bad! But still thos	#7
dmoroian Senior Member Dragos Join Date: Mar 2009 Posts: 648 Rep Power: 20	Sorry, my bad! But still those above should help you since they are able to read stl file formats too, and work with them. Dragos

December 10, 2007, 11:34	So Tetgen and Salome can perfo	#8
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 530 Rep Power: 20	So Tetgen and Salome can perform boolean operations on surface meshes or do surface reconstruction? That are really good news...

December 10, 2007, 11:48	You can also have a look to jc	#9
tog New Member Guillaume Alleon Join Date: Mar 2009 Posts: 3 Rep Power: 17	You can also have a look to jcae (http://jcae.sf.net)

December 10, 2007, 12:17	jcae does not seem to be able	#10
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 530 Rep Power: 20	jcae does not seem to be able to do boolean operations on meshes or surface reconstruction, does it?

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