yade-users team mailing list archive

[Klaus Thoeni <klaus.thoeni@xxxxxxxxxxxxxxxx>]

Hi Anton!

Thanks, I already had a look at these examples. However, there was no solution 
for my problem.

Klaus

On Fri, 19 Nov 2010 07:29:35 pm Anton Gladky wrote:
> Hi,
> 
> please, see an example
> ./examples/regular-sphere-pack/regular-sphere-pack.py
> 
> There you can find enough examples with diferent packing ways.
> 
> Anton
> 
> On Fri, Nov 19, 2010 at 1:40 AM, Klaus Thoeni <klaus.thoeni@xxxxxxxxx>wrote:
> > Hi Václav!
> > 
> > > > pack.inAlignedBox just works for a box which is aligned to the
> > 
> > coordinate
> > 
> > > > system. Is there a way to get an arbitrary aligned box (e.g. by
> > > > transforming the aligned box)?
> > > 
> > > If you need the sphere packing, you can transform it with
> > 
> > https://www.yade-dem.org/sphinx/yade.pack.html#yade._packSpheres.SpherePa
> > ck
> > 
> > > .rotate . Let me know if that is not enough for your purposes.
> > 
> > Well, use pack.regularHexa(...) with pack.inAlignedBox. Is there a way to
> > create such packings with pack.SpherePack()? Or how can I convert it in a
> > SpherePack()? I tried to pass the regularHexa packing to the SpherePack,
> > dosen't work. If this is going to work somehow it would be enough for my
> > purposes.
> > 
> > Example:
> > pred=pack.inAlignedBox((10.,0.,0.),(20,20,1.5))
> > hexapack = pack.regularHexa(pred,radius=0.5,gap=0.0,color=(0,1,0))
> > #O.bodies.append(hexapack)
> > sp=pack.SpherePack(hexapack) # not working, what should I use?
> > sp.rotate((0,1,0),-pi/4)
> > O.bodies.append([utils.sphere(c,r) for c,r in sp])
> > 
> > > The reason I did not create general box orientation is that checking
> > > whether particle is inside or outside is more complicated; but now I
> > > have the idea that it could be actually done by keeping corners and box
> > > transformation in the predicate, then transforming points to be
> > > checked, rather than checking points against true (non-aligned)
> > > boundaries.
> > 
> > Hm, I am a newbie and I still have to understand the difference between
> > the two
> > packing options. By the way, what's the difference? Can't you just use
> > predicates?
> > 
> > > > Is there a way to generate particles on a plane (e.g. gts-surface)?
> > > 
> > > Probably not directly (though you could create a thin volume for
> > > instance). Can you be more specific as to what usage you have in mind?
> > 
> > Thin volume works fine.
> > 
> > Thanks
> > 
> > Klaus
> > 
> > 
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-- 
Dr. Klaus Thoeni - Centre for Geotechnical and Materials Modelling
Civil, Surveying and Environmental Engineering - Engineering Building EA
The University of Newcastle, Callaghan, NSW 2308, Australia
web: http://livesite.newcastle.edu.au/cgmm
phone: +61 (0)2 4921 5118