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[Bruno Chareyre <question660522@xxxxxxxxxxxxxxxxxxxxx>]

Question #660522 on Yade changed:
https://answers.launchpad.net/yade/+question/660522

    Status: Needs information => Answered

Bruno Chareyre proposed the following answer:
Hi John, 
A question here is what is 'file.stl'.
If it comes from an analytical description of the shape, then this description could be used to filter some particles out. 
If your question is "how to do that for a general stl" it is more involved, it will need to define what is inside and what is outside for an arbitrary collection of facets. I'm not even sure there is a general answer.

If you know how to define "inside" and "outside", then you can simply write 
sp.makeCloud((0,0,3),(20,20,15),rMean=0.5)
for x,r in sp:
     if (is inside) sp.toSimulation()

Cheers
Bruno

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