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[Václav Šmilauer <eudoxos@xxxxxxxx>]

Luc, if you update to 1908, have a look at
file:///home/vaclav/yade/ydoc/_build/html/modules.html#yade.utils.sphere

Passing a function as material will help you to get independent material
instances from randomSpherePack; something like:

def makeMat(): return ElasticMat(young=30e6,poisson=.3,density=2e3)
pack.randomDensePack(....,material=makeMat)

makeMat will be called for each sphere created; it always returns the
"same" material, but they are independent objects and you will be able
therefore to change their parameters independently.

-- 
Cannot modify material properties to some identified elements
https://bugs.launchpad.net/bugs/498089
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Status in Yet Another Dynamic Engine: Invalid

Bug description:
ubuntu Karmic
yade 1899

All the elements are concerned when I try to change some material properties of some of them. Quite strange because I do not have the problem when it is about their color. I attached the python script as an example.