[Gmsh] Geometry definition problem.

[Archi Forshop]

Olivier,

> > Dear GMSH users,
> >
> >          I am a newbie.
> >
> > I'm trying to build a mesh. Its geometry is
> defined 
> by two
> > cylinders intersecting in the middle. When I try
> to 
> build the mesh,
> > the error message is that the boundary is not 
> recovered. The reason
> > seems to be that the geometry does not properly 
> define the surface
> > of the volume.
> >
> 
> There is no surface intersection primitive in gmsh. 
> Gmsh is an academic product that only hndles simple 
> geometries. You can of course provide us some code 
> that does such a job ;-)
> 
> Jean-Francois Remacle.
> 
> 
> 
> 
> > How can I change it? Do I need to calculate the 
> intersection
> > points of the two cylinders?

Looks like the only option. If it's a one time
operation (which I doubt), then it is much better to
actually compute it (in terms of Bezier, BSpline or
Spline for the intersection). Otherwise, I would
suggest to take a look at solid modelling package IRIT
located at (http://www.cs.technion.ac.il/~irit/). This
one is a very much advanced geometric parametric
modelling treasure (in the spirit of Gmsh) that I use
from time to time that would let you compute the
intersection at no time once you learn how to handle
it. Then plug numbers into Gmsh. I have never tried
this sequence but I see no reason why this should not
work out.

...Archi


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