translation of a rotating cylinder

Hi Guilhem,
please provide a MWE [1] (a short but complete script, such that we can test it ourselves)
thanks
Jan

[1] https://yade-dem.org/wiki/Howtoask

Ok, sorry.

Here is just a simple code showing the problem (no spheres, not important)

#####################
#creation du cylindre
#####################
rouleau_r=4
roul=O.bodies.append(geom.facetCylinder((-rouleau_r,2,rouleau_r),radius=rouleau_r,height=2,orientation=Quaternion((1,0,0),pi/2),wallMask=7,segmentsNumber=15))

#####################
#moteur de resolution
#####################
O.engines=[
   ForceResetter(),
   #prise en compte des toutes les particules, facets et walls pour les interactions
   InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb(),Bo1_Wall_Aabb()]),
   InteractionLoop(
      #prise en compte des interactions sphere+sphere and facet+sphere
      [Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom()],
      #parametre de friction
      [Ip2_FrictMat_FrictMat_FrictPhys()],
      #loi d interaction
      [Law2_ScGeom_FrictPhys_CundallStrack()]
   ),
   NewtonIntegrator(gravity=(0,0,-9.81),damping=0.5),
]

#####################
#translation/rotation
#####################
O.engines=O.engines[:4]+[RotationEngine(ids=roul,angularVelocity=0.,rotationAxis=(0,1,0),label='rotEngine')+TranslationEngine(ids=roul,translationAxis=(1,0,0),velocity=10,label='transEngine')]+O.engines[4:]

print 'vitesse', transEngine.velocity

avec l'erreur:
Traceback (most recent call last):
  File "/usr/bin/yade", line 178, in runScript
    execfile(script,globals())
  File "test.py", line 30, in <module>
    print 'vitesse', transEngine.velocity
NameError: name 'transEngine' is not defined
/usr/lib/python2.7/dist-packages/IPython/frontend.py:30: UserWarning: The top-level `frontend` package has been deprecated. All its subpackages have been moved to the top `IPython` level.
  warn("The top-level `frontend` package has been deprecated. "
vitesse[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view (use h-key for showing help), F10 both, F9 generator, F8 plot. ]]

Same error with a more complex code.

Thanks a lot

Hi Guilhem,
thanks for the script. Yes, labels in this case are not taken into account. Currently only labels of "first order" engines plus special cases (like bound functors of collider or Ig2, Ip2 and Law2 functors of InteractionLoop) are projected to python, see [1,2].
Adding CombinedKinematicEngine should not be a problem, but it is not currently available.

A workaround:
####
transEngine = TranslationEngine(ids=roul,translationAxis=(1,0,0),velocity=10)
rotEngine = RotationEngine(ids=roul,angularVelocity=0.,rotationAxis=(0,1,0))
O.engines=O.engines[:4]+[rotEngine+transEngine]+O.engines[4:]
####

cheers
Jan

[1] https://github.com/yade/trunk/blob/master/py/wrapper/yadeWrapper.cpp#L542
[2] https://github.com/yade/trunk/blob/master/py/wrapper/yadeWrapper.cpp#L714

Hi,

What if you include these TranslationEngine and RotationEngine in O.engines from the start, with dead [*] initially = 1, and just switching to dead = 0 when you actually need these engines ?

(My guess is that labels should work in this case ??..)

[*] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.TranslationEngine.dead

@Jerome:
The problem is not that it is not in O.engines from the start, but that RotationEngine+TranslationEngine is actually CombinedKinematicEngine. The label of CombinedKinematicEngine would be put into python, but not its subengines.
see the links from my previous message
Jan

Hi Guilhem,
just a remark, your code from #2 should work in yadedaily or compiled new version [1] :-)
cheers
Jan

[1] https://github.com/yade/trunk/commit/cad9387c96fad5c4f8a1dab5bfd724b14a502b13