Thanks Qianqian & subdomains

[Dipnoi]

Just wanted to say a BIG thanks Qianqian, 

Got the cgalv2m method working nicely now with mesh2abaqus script (Michael Wang's). For some reason I cannot get saveabaqus to work, nevermind. Now having great fun meshing all sorts of stuff. 

Just wondered if you had considered implementing cgal's different sizing field for different subdomains?

cheers

[Qianqian Fang]

On 04/25/2013 01:28 PM, Dipnoi wrote:

Just wanted to say a BIG thanks Qianqian,

you are welcome! glad to hear everything works.

Got the cgalv2m method working nicely now with mesh2abaqus script (Michael Wang's). For some reason I cannot get saveabaqus to work, nevermind. Now having great fun meshing all sorts of stuff.

I will try to improve saveabaqus in the future, but I will need
people's help as I am not using abaqus at this point.

Just wondered if you had considered implementing cgal's different sizing field for different subdomains?

yes, iso2mesh has it in the latest code. Please check out
my reply to Neis's questions recently:

https://groups.google.com/group/iso2mesh-users/browse_thread/thread/d57b98beb52756c8/fbea528130c6153e?hl=en&lnk=gst&q=sizing+field#fbea528130c6153e

Qianqian

cheers

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[Dipnoi]

Wow, the subdomain maxvol is great (see image). 

Just wondering now if there is a way of smoothing the interface between materials?

As you can see the interface is pretty good but occasionally you get tetra sticking out in either direction. Seems to happen more on the external surface compared to interior.

Is cgal's feature preservation (edge size) likely to help?

cheers

[Qianqian Fang]

On 04/26/2013 09:28 AM, Dipnoi wrote:

Wow, the subdomain maxvol is great (see image). 

Just wondering now if there is a way of smoothing the interface between materials?

As you can see the interface is pretty good but occasionally you get tetra sticking out in either direction. Seems to happen more on the external surface compared to interior.

one thing I tried before is to use v2s('cgalmesh') to extract
the outer/inner surfaces, and then run sms() to smooth the surface.
However, the smoothing can not be too strong because it may cause
self-intersecting elements. After smoothing, you pass the output
to s2m() and manually identify the seeding points for each label.

Is cgal's feature preservation (edge size) likely to help?

do you have a link for this? I know cgal accepts a feature line
input and reinforce the edges, but user has to define that line
first.

Qianqian

[Dipnoi]

Yes, I think you are right. I was referring to figure 54.11 and associated code (http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Mesh_3/Chapter_main.html). Looks like polylines are defined.

An alternative would be to smooth the boundaries by hand - any suggestion for good freeware to edit tetra meshes?

thanks

[Dipnoi]

Just another update,

One of the CGAL team website shows feature preserving in the liver example:

http://raweb.inria.fr/rapportsactivite/RA2009/geometrica/uid16.html

Appears to smooth the jagged edge problem but not clear how the polylines are defined for complex geometries.