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[Jan Stránský <question673124@xxxxxxxxxxxxxxxxxxxxx>]

Question #673124 on Yade changed:
https://answers.launchpad.net/yade/+question/673124

    Status: Open => Answered

Jan Stránský proposed the following answer:
Thanks for clarification :-)

as you have it, the vtk.exportSpheres is called just once, hence you get only one file..
To get vtk files regularly during the simulation, you have to use PyRunner [1] in O.engines and call an export function from it, something like:

####
def doExport():
   vtk.exportSpheres(...)

O.engines = [
   ...
   PyRunner(iterPeriod=1000,command="doExport()"), # you can use realPeriod or virtPeriod, see [1]
]
####

or you can do the run "in cycle":
####
for i in range(20):
   O.run(1000,True)
   vtk.exportSpheres(...)
####

cheers
Jan

[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.PyRunner

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