Re: quadratic planes

For reasons that would be far to long to explain here, i need a shape 
that is really close to an actual cylinder so that i will have to use 
very little triangles. The perspective to use trimesh to achieve this, 
seems to me tedious ; and i have read somewhere that ODE gets into 
troubles when the triangles are too small.
Furthermore, the vessel will probably be completed with a cone in the 
lower part, so that the use of  quadratic planes would be much more 
interesting, avoiding me another tedious trimesh-based geom construction.
Finaly, i want the actual dimensions of the vessel to be entirely 
customizable so that it would be really easier for me to use quadratic 
planes rather than working on parametrized trimesh-based geometry (in 
particular because of the size of each triangle that should stay small).

Benoit


Delerue Jean-Francois a écrit :
>
> Hello,
>
> Why don't you simply build your surface as a trimesh?
>
> Jean Francois
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf Of
> Benoit Forestier
> Sent: Wednesday, September 19, 2007 16:24 PM
> To: [email protected]
> Subject: [ODE] quadratic planes
>
>
> Hello,
> firstly, i would like to apologize for my poor english.
> I would like to simulate  the motion (and collisions) of spheres within
> an
> empty cylinder.
> from what i saw in the user guide, there is no geom type i can use to
> perform that kind of calculation.
> has anybody heard about any quadratic plane geom class (i.e. a plane
> with
> equation of the form ax^2 + by^2 + cz^2 + dxy + exz + fyz + gx + hy + iz
> + j
> = 0)?
> should i  build my own class?
> is there any other way to model a cylindrical vessel?
> Thanks
> -- 
> View this message in context:
> http://www.nabble.com/quadratic-planes-tf4480661.html#a12776330
> Sent from the ODE mailing list archive at Nabble.com.
>
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-- 
Benoit FORESTIER

Postdoctorant,
Institut de radioprotection et de sûreté nucléaire (IRSN)
Direction de la sûreté des usines, des laboratoires, des transports et des déchets (DSU)
Service d'expertise, d'études et de recherches en criticité (SEC)
Laboratoire d'études, de recherche, de développement et de qualification des codes (LERD)

Benoit FORESTIER
IRSN/DSU/SEC/LERD
BP 17 - 92262 Fontenay-Aux-Roses Cedex

[email protected]