From: Axel Kohlmeyer (
Date: Sun Feb 05 2012 - 11:07:34 CST

On Sun, Feb 5, 2012 at 10:53 AM, Cosseddu, Salvatore
<> wrote:
> Dear All,
> As a consequence of the perspective view, the spheres (i.g. ions) that lies
> on the borders of the OpenGL display assume a oval shape.
> I can not find a way to avoid this problem, even because the shape is
> maintained once rendered (tachyonInternal, Pov-ray)

sorry, but i don't understand the question.
you cannot have perspective project *and*
perfect spheres. the distortion is part of
the projection. so where is the problem?
if you want to have perfect spheres, you
have to switch to orthographic projection.
that will maintain shapes.


> Regards
> Salvatore
> --
> Salvatore Cosseddu
> PhD student
> Centre for Scientific Computing and School of Engineering
> University of Warwick
> Coventry CV4 7AL
> United Kingdom
> email:

Dr. Axel Kohlmeyer
College of Science and Technology
Temple University, Philadelphia PA, USA.