> On 14 Aug 2016, at 16:49, Jim Monte <[email protected]> wrote:
>
> Hi All,
>
> I am very new here. I need to make many circles. The documentation says in
> section 5.1.2
> "Circle ( expression ) = { expression, expression, expression };
> Creates a circle arc (strictly) smaller than Pi..."
>
> This would mean at least three perimeter points would be needed to make each
> circle. I tried with two points making arcs exactly pi radians each. They
> display properly, but I am wondering what problems I would have making all of
> the circles with two points (and a center point) instead of more. Thanks for
> any information.
The little internal Gmsh CAD engine is indeed limited to circle arcs < Pi. When
= Pi the specification of the plane in which the circle lives cannot be
computed in a univoque manner.
(It's not documented but you can actually specify the plane by its normal
vector explicitly as follows: Circle(num) = {p1,p2,p3} Plane {nx,ny,nz};)
Christophe
> Jim
>
>
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--
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine
Tetrahedron V, July 4-5 2016: http://tetrahedron.montefiore.ulg.ac.be
Free software: http://gmsh.info | http://getdp.info | http://onelab.info
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