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[Jan Stránský <question701566@xxxxxxxxxxxxxxxxxxxxx>]

Question #701566 on Yade changed:
https://answers.launchpad.net/yade/+question/701566

Jan Stránský proposed the following answer:
Hello,

> My simulation works with single material

please provide the code

> the difference is the radius and the density.

only?
what about the makeCloud?

> sp_PH101=pack.SpherePack()
> sp_PH101.makeCloud(...)
> sp_PH101.toSimulation(material=matPH101,color=(0,1,1))
> sp_CCS=pack.SpherePack()
> sp_CCS.makeCloud(...)
> sp_CCS.toSimulation(material=matCCS,color=(1,0,1))

Why do you use two SpherePack instances? The you get independent clouds
possibly with overlapping spheres pushing them with non-realistic speed,
possibly causing "flying away".

Try with one SpherePack instance, then spheres are not overlapping.
Something like:
###
sp=pack.SpherePack()
sp.makeCloud(...)
n1 = len(sp)
sp.makeCloud(...)
for i,(c,r) in snumerate(sp):
    mat = matPH101 if i < n1 else matCSS
    color = (0,1,1) if i < n1 else (1,0,1)
    O.bodies.append(sphere(c,r,material=mat,color=color)
###

Cheers
Jan

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