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[Jan Stránský <question599692@xxxxxxxxxxxxxxxxxxxxx>]

Question #599692 on Yade changed:
https://answers.launchpad.net/yade/+question/599692

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi Daniel,

> I'm new to Yade

welcome :-)

> Because facets don't have ids. :(

all bodies in Yade have ids. When you O.bodies.append multiple bodies at once, a list of their IDs is returnd, so 'ring' in your script is a list of IDs. 
O.bodies append with one body returns its ID, so ring.id would not work anyway..

The solution is to use

bottomID = ring[something] # 'something' depends on what is returned geom.facetCylinder, I don't know the function myself..
...
Fz = O.forces.f(bottomID)[2] # 2 is z-component

if you want to sum forces from entire facetCylinder, you can use
fSumZ = sum(O.forces.f(id)[2] for id in ring)

cheers
Jan

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