# [Gmsh] Help

**Henri Pascal-Jenny**
henri.pascal-jenny at sogeti.com

*Thu Jun 17 11:26:36 CEST 2010*

Hi
I am facing the problem of finding the minimum-3D box enclosing AS CLOSE AS
POSSIBLE a set of 3D mesh points .
I would like to avoid the use of a too-sophisticated algorithm .
(cf. http://en.wikipedia.org/wiki/Minimum_bounding_box_algorithms)
Actually, when used straightforwardly, the method "BoundingBox" available
in a gmesh-session returns a 3D box
which box does not always correspond to the minimum volume enclosing the set
of points
( imagine a thin and not fully-planar shape tilted in respect to the axes of
a standard coordinates-frame )
In fact, the matter comes from the bulk orientation of the envelop of the
set of points under consideration.
The usage is :
BoundingBox { expression, expression, expression, expression, expression,
expression };
what forces the bounding box of the scene to the given expressions (X min, X
max,
Y min, Y max, Z min, Z max).
Therefore, I am wandering if there is a way of operating the "BoundingBox"
method in order to get in the end the truly-minimum 3D box enclosing.
Actually, I guess that there is a preliminary thing to do related to the
coordinates system ; maybe I am wrong.
Well, I would appreciate it very much if anyone could supply me for any
piece of information regarding my problem.
Thanks a lot in advance for your attention and your cooperation.
Regards
Henri Pascal-Jenny
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.geuz.org/pipermail/gmsh/attachments/20100617/9522a6bb/attachment.html>