[Tochnog-devel] Re: [Tochnog-users] contact_geometry problem

[<jto...@un...>]

Hi, tochnoggers,
 before all, happy new year.
 I think there is a bug in the code. Please someone who can look at=20
geometry.cc, lines 334-336. The goal of those lines are computing the=20
normal to a ellipse, but in fact:

  1. The b/a factor would have to be squared
  2. If 1. would be true, then y/x should be used, and not x/y. There=20
may also be some bug on the sign, to make the normal point outwards=20
the ellipse.

 Please, check it, and if you agree, I will correct and put it to the=20
CVS.


  Best,

  Jes=FAs Torrecilla=20

> I have modified the home page metal forging example using=20
> geometry_circle in place of geometry_line as the contacting object.=20
> It works fine.  But if I use geometry_ellipse or=20
geometry_polynomial,=20
> contact does not seem to be detected at all.  Is there something=20
> wrong with the code or am I overlooking something obvious?
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> --=20
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> Jeffrey A. Hinkley, Ph.D.
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