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[Henry <question253483@xxxxxxxxxxxxxxxxxxxxx>]

New question #253483 on Yade:
https://answers.launchpad.net/yade/+question/253483

Hi all,
   I want to use the desity scaling  in a numerical test. The script as follows:
    
O.engines=[
	ForceResetter(),
     ……
        NewtonIntegrator(damping=0.2, label='Newton'), #damping=0.999
       GlobalStiffnessTimeStepper(label='ts'),
     ……
]

O.timingEnabled=1
timing.reset()
O.dt=.5*utils.PWaveTimeStep()
Newton.densityScaling=True
for b in O.bodies:
    if isinstance(b.shape,Sphere):
        b.state.mass=1.0e10*b.state.mass

However, when the code run after some steps, all the particles have disappeared.

Anyone can help me? 
Thanks a lot!

Henry

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