TELEMAC-MASCARET Forum: BK islands generated in the mesh near submeshes (2/3)

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TOPIC: BK islands generated in the mesh near submeshes

Re: BK islands generated in the mesh near submeshes 12 years 3 months ago #5319

saadben	Access to this link is denied by the restrictions on Internet use in my company... About your mesh, did you try to do it with "the mesh channel"?? Regards
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Re: BK islands generated in the mesh near submeshes 12 years 3 months ago #5320

Proust_Nicolas OFFLINE Senior Boarder Posts: 136 Thank you received: 2	Yes I used "the mesh channel" for submeshes. The islands are generated near the the mesh channel part. Regards
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Re: BK islands generated in the mesh near submeshes 12 years 3 months ago #5321

saadben	what are you mean by "near the mesh"?? islands are on the mesh or outside of the mesh?? normally to have islands, you must define hard lines in the mesh generator... regards
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Re: BK islands generated in the mesh near submeshes 12 years 3 months ago #5322

saadben	saadben wrote: what are you mean by "near the mesh"?? normally to have islands, you must define hard lines in the mesh generator... regards edit
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Re: BK islands generated in the mesh near submeshes 12 years 3 months ago #5329

Proust_Nicolas OFFLINE Senior Boarder Posts: 136 Thank you received: 2	The islands are near the submeshes and inside the mesh. saadben wrote: normally to have islands, you must define hard lines in the mesh generator... Yes I know it. I don't want to have islands here in my mesh but its are automatically generated... that's the problem!
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BK islands generated in the mesh near submeshes 12 years 2 months ago #5572

Proust_Nicolas OFFLINE Senior Boarder Posts: 136 Thank you received: 2	Hi, I tried to use the new version of BK to generate again my mesh. I have always islands near my chanel submeshes even if I did not create close lines. Is anybody a solution to solve the issue? Best regards Nicolas
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BK islands generated in the mesh near submeshes 12 years 2 months ago #5578

Serrer
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Hi Nicolas,

I just had a look at your meshing problem.

I'm afraid I don't have a real answer but it is somehow related to the large number of very short softlines (MUCH shorter and closer together than the local edge lengths specified) in the "Oleron-Iso-6v197m-filtre" coverage.

The only thing I can suggest is that you try to remove as many of these non-essential lines as possible.

When I look at a closeup (image attached) it's not clear to me what purpose these short soft lines are supposed to serve. And hence I'm not sure how to deal with them.

Sorry but that's all I've got for now... Martin

Attachments:

Closeup.png (140KB)

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BK islands generated in the mesh near submeshes 12 years 2 months ago #5579

c.coulet OFFLINE Moderator Posts: 3722 Thank you received: 1031	Hi I have similar remark. In a first time, I suggest you remove all small lines in the oleron-iso-6v197m-filtre layer which are near the submesh (in the 20m arround for example). I also advise you to increase the density near the connexion of the 3 submeshes... Regards
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BK islands generated in the mesh near submeshes 12 years 2 months ago #5581

Proust_Nicolas
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The short softlines are expected to represent dikes. These dikes are very thin (maybe 1m for the thinest).
So I did not want to mesh with 1m criteria to limit time calculation. I have extracted the isoline of the crest level of the dikes and I used it in softline. I have meshed with a bigger criteria than 1m (20m here) and I have anyway the nodes on the dikes.
I try to use this way to represent small entity with pretty "big" mesh.

Nicolas

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BK islands generated in the mesh near submeshes 12 years 2 months ago #5584

Serrer OFFLINE Moderator Posts: 720 Thank you received: 304	OK, I understand. However, you can't have it both ways. There is no way to represent 1m features with 20m triangles. If you don't want to reduce the size of the triangles, you'll have to pick the most influential features/dikes and model those. Another idea is to resample the dike crests (not the isolines) to some acceptable resolution and supply those as hard lines. Good luck... Martin
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