yade-users team mailing list archive

[Václav Šmilauer <eudoxos@xxxxxxxx>]

> Hi, I am a new user.  I have sufficiently understood the
> general purpose of Engines/Preprocessors and where to find the Contact
> Laws.  My intention is to explore the possibility of using YADE to
> create a slope or a tunnel (separate problems).  I understand that
> 'boxes' are used to surround the particles to contain them in a 3D
> space, when isDynamic != 0.  However, I would like the face of the
> slope to be 'free', and would also want the tunnel perimeter/arc to be
> 'free'.  How do I arrange the particles to make a slope?  How do I
> remove particles to make a tunnel?  Of course, there could be other
> techniques.  Please help.
Don't use boxes, use facets instead, they let you create arbitrary
triangular mesh (and are better supported anyway). See
scripts/test/gts-horse.py (for import from gts), examples/mill.py (for
explicit construction of the surface from individual triangles),
examples/STLImportTest.py (import of the mesh from STL file),
examples/cyl.py (triangulating polylines in space).

Also see documentation at http://beta.arcig.cz/~eudoxos/yade/epydoc/,
notably the module yade.pack and functions gtsSurface2Facets
<http://beta.arcig.cz/%7Eeudoxos/yade/epydoc/yade.pack-module.html#gtsSurface2Facets>,
sweptPolylines2gtsSurface
<http://beta.arcig.cz/%7Eeudoxos/yade/epydoc/yade.pack-module.html#sweptPolylines2gtsSurface>
and revolutionSurfaceMeridians
<http://beta.arcig.cz/%7Eeudoxos/yade/epydoc/yade.pack-module.html#revolutionSurfaceMeridians>
(which you might use for complex tunnel shape).

Cheers, Vaclav
>
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Oh, cool.