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# Re: [femm] Call to triangle unsucessful after import of DXF

- To: femm@yahoogroups.com
- Subject: Re: [femm] Call to triangle unsucessful after import of DXF
- From: David Meeker <dmeeker@ieee.org>
- Date: Thu, 12 Dec 2002 23:51:27 -0500
- References: <atacjq+v3ob@eGroups.com>
- User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.1) Gecko/20020826

stefannilsson2003 wrote:

> `Hello,
> David helped me to fix femm 3.2 so that I can import DXF from Autocad
> R14. But when I try to create mesh I get the message:Call to triangle
> unsucessful. What is the problem?
> My model consists of permanetmagnets placed on a steel plate with R
> 455 mm. It's for a magnet drum.
> Help appreciated. I can send model if needed.
> Regards
> Stefan Nilsson
> `

Just about the only thing that will throw triangle is if you have a geometry where two lines create a really small angle. This can occur when you have, for example, a line that is tangent to a circle, as I think is the case in your problem.
Pretty much the only cure is to re-draw the problem, forcing an angle of at least 1 degree if the object really do have to meet at just one point of tangency or leaving a small gap between your magnets and your plates.
Dave.

    --
    David Meeker
    dmeeker@ieee.org
    http://femm.berlios.de/dmeeker

- References:
  - Call to triangle unsucessful after import of DXF
    - From: "stefannilsson2003 <stefan.a.nilsson@metso.com>" <stefan.a.nilsson@metso.com>

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