Yade

Can not run the old code in the new version even if changed something following the instruction

Asked by Liqing Jiao

Dear All,

I can run my code well in 0.5 version. But if I decrease the strain rate applying the triaxial load, the "segmentation fault" will be appeared and stop the modeling. I see the new version that is 0.6.2, have already solved the problem looks like that the same message stop the modeling. I think maybe my problem can also be solved through changed the version of Yade. Then I installed the new version 0.60.2 instead of the old version 0.50. And I modified my python code following the error reminder. But the "segmentation fault" also appear even through I run the code that can run well in the old version. The process is listed as follow:

jiaoliqing@ubuntu:~/YADE/bin$ yade-cleanComp060 16-09-re-3d.py
Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `yeascu'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
Traceback (most recent call last):
  File "/home/jiaoliqing/YADE/bin/yade-cleanComp060", line 152, in runScript
    execfile(script,globals())
  File "16-09-re-3d.py", line 48, in <module>
    spheres=regularHexa_J(pack.inAlignedBox((-.25*specimenLength,-.05*specimenLength,-.25*specimenLength),(.25*specimenLength,.05*specimenLength,0.25*specimenLength)),radius=sphereRadius,gap=0.0,material=concreteId)
NameError: name 'specimenLength' is not defined
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]:
Do you really want to exit ([y]/n)?
Yade: normal exit.
Terminated
jiaoliqing@ubuntu:~/YADE/bin$ yade-cleanComp060 16-09-re-3d.py
Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `esacks'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
Traceback (most recent call last):
  File "/home/jiaoliqing/YADE/bin/yade-cleanComp060", line 152, in runScript
    execfile(script,globals())
  File "16-09-re-3d.py", line 50, in <module>
    spheres=regularHexa_J(pack.inAlignedBox((-.25*specimenLength,-.05*specimenLength,-.25*specimenLength),(.25*specimenLength,.05*specimenLength,0.25*specimenLength)),radius=sphereRadius,gap=0.0,material=concreteId)
TypeError: can't multiply sequence by non-int of type 'float'
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]:
Do you really want to exit ([y]/n)?
Yade: normal exit.
Terminated
jiaoliqing@ubuntu:~/YADE/bin$
jiaoliqing@ubuntu:~/YADE/bin$ yade-cleanComp060 16-09-re-3d.py
Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `ucssye'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
Traceback (most recent call last):
  File "/home/jiaoliqing/YADE/bin/yade-cleanComp060", line 152, in runScript
    execfile(script,globals())
  File "16-09-re-3d.py", line 50, in <module>
    spheres=regularHexa_J(pack.inAlignedBox((-.25*0.1,-.05*0.1,-.25*0.1),(.25*0.1,.05*0.1,0.25*0.1)),radius=sphereRadius,gap=0.0,material=concreteId)
  File "16-09-re-3d.py", line 33, in regularHexa_J
    a=2*radius+gap
TypeError: can only concatenate tuple (not "float") to tuple
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]:
Do you really want to exit ([y]/n)?
Yade: normal exit.
Terminated
jiaoliqing@ubuntu:~/YADE/bin$ yade-cleanComp060 16-09-re-3d.py
Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `kcaesy'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
Traceback (most recent call last):
  File "/home/jiaoliqing/YADE/bin/yade-cleanComp060", line 152, in runScript
    execfile(script,globals())
  File "16-09-re-3d.py", line 113, in <module>
    [Ip2_2xCohFrictMat_CohFrictPhys(setCohesionNow=False,setCohesionOnNewContacts=True,normalCohesion=40e3,shearCohesion=40e3)],
AttributeError: No such attribute: shearCohesion.
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]:
Do you really want to exit ([y]/n)?
Yade: normal exit.
Terminated
jiaoliqing@ubuntu:~/YADE/bin$ yade-cleanComp060 16-09-re-3d.py
Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `aduksy'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
Traceback (most recent call last):
  File "/home/jiaoliqing/YADE/bin/yade-cleanComp060", line 152, in runScript
    execfile(script,globals())
  File "16-09-re-3d.py", line 113, in <module>
    [Ip2_2xCohFrictMat_CohFrictPhys(setCohesionNow=False,setCohesionOnNewContacts=True,normalAdhesion=40e3,shearAdhesion=40e3)],
AttributeError: No such attribute: normalAdhesion.
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]:
Do you really want to exit ([y]/n)?
Yade: normal exit.
Terminated
jiaoliqing@ubuntu:~/YADE/bin$ yade-cleanComp060 16-09-re-3d.py
Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `kecyas'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
/home/jiaoliqing/YADE/lib/yade-cleanComp060/py/yade/__init__.py:114: DeprecationWarning: Class `Law2_ScGeom_CohFrictPhys_ElasticPlastic' was renamed to (or replaced by) `Law2_ScGeom_CohFrictPhys_CohesionMoment', update your code! (you can run 'yade --update script.py' to do that automatically)
/home/jiaoliqing/YADE/lib/yade-cleanComp060/py/yade/__init__.py:114: DeprecationWarning: Class `InteractionDispatchers' was renamed to (or replaced by) `InteractionLoop', update your code! (you can run 'yade --update script.py' to do that automatically)
Traceback (most recent call last):
  File "/home/jiaoliqing/YADE/bin/yade-cleanComp060", line 152, in runScript
    execfile(script,globals())
  File "16-09-re-3d.py", line 119, in <module>
    SnapshotEngine(iterPeriod=200,fileBase='/tmp/12_08_c-',viewNo=0),
NameError: name 'SnapshotEngine' is not defined
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]:
Do you really want to exit ([y]/n)?
Yade: normal exit.
Terminated
jiaoliqing@ubuntu:~/YADE/bin$ yade-cleanComp060 16-09-re-3d.py
Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `csuaky'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
/home/jiaoliqing/YADE/lib/yade-cleanComp060/py/yade/__init__.py:114: DeprecationWarning: Class `Law2_ScGeom_CohFrictPhys_ElasticPlastic' was renamed to (or replaced by) `Law2_ScGeom_CohFrictPhys_CohesionMoment', update your code! (you can run 'yade --update script.py' to do that automatically)
/home/jiaoliqing/YADE/lib/yade-cleanComp060/py/yade/__init__.py:114: DeprecationWarning: Class `InteractionDispatchers' was renamed to (or replaced by) `InteractionLoop', update your code! (you can run 'yade --update script.py' to do that automatically)
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]:
Do you really want to exit ([y]/n)?
Yade: normal exit.
Terminated
jiaoliqing@ubuntu:~/YADE/bin$ yade-cleanComp060 16-09-re-3d.py
Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `caseuy'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
Traceback (most recent call last):
  File "/home/jiaoliqing/YADE/bin/yade-cleanComp060", line 152, in runScript
    execfile(script,globals())
  File "16-09-re-3d.py", line 114, in <module>
    [LLaw2_ScGeom_CohFrictPhys_CohesionMoment()]
NameError: name 'LLaw2_ScGeom_CohFrictPhys_CohesionMoment' is not defined
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]:
Do you really want to exit ([y]/n)?
Yade: normal exit.
Terminated
jiaoliqing@ubuntu:~/YADE/bin$ yade-cleanComp060 16-09-re-3d.py
Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `ykecsu'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
/home/jiaoliqing/YADE/lib/yade-cleanComp060/py/yade/__init__.py:114: DeprecationWarning: Class `InteractionDispatchers' was renamed to (or replaced by) `InteractionLoop', update your code! (you can run 'yade --update script.py' to do that automatically)
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]: ---------------------------------------------------------------------------
KeyboardInterrupt Traceback (most recent call last)

/home/jiaoliqing/YADE/lib/yade-cleanComp060/py/yade/__init__.pyc in refreshEvent(self)
    187 def yzxSlot(self): self.setViewAxes((-1,0,0),(0,0,1))
    188 def zxySlot(self): self.setViewAxes((0,-1,0),(1,0,0))
--> 189 def refreshEvent(self):
    190 self.refreshValues()
    191 self.activateControls()

KeyboardInterrupt:

Do you really want to exit ([y]/n)?
Yade: normal exit.
Terminated
jiaoliqing@ubuntu:~/YADE/bin$ yade-cleanComp060 16-09-re-3d.py
Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `ceuykd'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]: 10567 WARN yade.Engine /home/jiaoliqing/yade-0.60.2/pkg/common/Collider.cpp:41 findBoundDispatcherInEnginesIfNoFunctorsAndWarn: Collider.boundDispatcher had no functors defined, while there was a BoundDispatcher found in O.engines. Since version 0.60 (r2396), Collider has boundDispatcher integrated in itself; separate BoundDispatcher should not be used anymore. For now, I will fix it for you, but change your script! Where it reads e.g.

 O.engines=[...,
  BoundDispatcher([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
  InsertionSortCollider(),
  ...
 ]

it should become

 O.engines=[...,
  InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
  ...
 ]

instead.
python: malloc.c:4628: _int_malloc: Assertion `(unsigned long)(size) >= (unsigned long)(nb)' failed.
Segmentation fault
jiaoliqing@ubuntu:~/YADE/bin$ yade-cleanComp060 16-09-re-3d.py
Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `daeusy'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]: Segmentation fault

May I have your help? Could you explain that why the segmentation fault will appear when I dwindle the loading rate? And how to solve this problem? Thank you!
Looking forward to your replay!

Best Regards
Liqing

Question information

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Revision history for this message
Anton Gladky (gladky-anton) said : 		#1

Hi,

please, file a bug, using bugtracker [1] and attach the crashing script (better simplify it, as you can).
It would be also good, if you test your script with the latest trunk version.

[1] https://bugs.launchpad.net/yade
[2] https://www.yade-dem.org/source/yade_latest_trunk.tgz

A.

Revision history for this message
Liqing Jiao (liqing) said : 		#2

Dear All,

Thanks for Anton's suggestion. I simplified the question as follows:
My phthon file is
from yade import pack,plot
import itertools

O.materials.append(CohFrictMat(young=150e10,poisson=.2,frictionAngle=0,density=7800,isCohesive=True,isBroken=True,normalCohesion=40e3,shearCohesion=40e3,label='frictionless'))
sphereRadius=1e-3,
concreteId=O.materials.append(CohFrictMat(young=2.514e6,poisson=.5,frictionAngle=0.5,density=1130,isCohesive=True,isBroken=True,))
spheres=pack.regularHexa(pack.inAlignedBox((-.25*0.1,-.05*0.1,-.25*0.1),(.25*0.1,.05*0.1,0.25*0.1)),radius=1e-3,gap=0.0,material=concreteId)
O.bodies.append(spheres)
## create walls around the packing
walls=utils.aabbWalls(thickness=.0001,material='frictionless')
wallIds=O.bodies.append(walls)
triax=ThreeDTriaxialEngine(
    wall_bottom_id=wallIds[2],
    wall_top_id=wallIds[3],
    wall_left_id=wallIds[0],
    wall_right_id=wallIds[1],
    wall_back_id=wallIds[4],
    wall_front_id=wallIds[5],
    internalCompaction=False,
        strainRate1=3.3e-4,
        stressControl_1=False,
        stressControl_2=False,
        stressControl_3=False,
    label='strainer',
)
O.engines=[
    ForceResetter(),
    #BoundDispatcher([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]),
    InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]),
    #InsertionSortCollider(nBins=5,binCoeff=5,sweepLength=.05*1e-3),
    InteractionLoop(
        [Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
        [Ip2_2xCohFrictMat_CohFrictPhys(setCohesionNow=False,setCohesionOnNewContacts=True)],
        [Law2_ScGeom_CohFrictPhys_CohesionMoment()]
    ),
    GlobalStiffnessTimeStepper(),
    triax,
    NewtonIntegrator(damping=.4),

]
O.run()

It is not complicated. But when I run it in the 0.60.2 version, the error appear as follow:
Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `ksudys'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]: Segmentation fault
No other information come out. If you know why it can not run well, could you tell me how to modify it? Thank you!

Cheers
Liqing

At 2011-04-11，"Anton Gladky" <email address hidden> wrote:

>Question #152385 on Yade changed:
>https://answers.launchpad.net/yade/+question/152385
>
> Status: Open => Answered
>
>Anton Gladky proposed the following answer:
>Hi,
>
>please, file a bug, using bugtracker [1] and attach the crashing script (better simplify it, as you can).
>It would be also good, if you test your script with the latest trunk version.
>
>[1] https://bugs.launchpad.net/yade
>[2] https://www.yade-dem.org/source/yade_latest_trunk.tgz
>
>A.
>
>--
>You received this question notification because you are a member of
>yade-users, which is an answer contact for Yade.
>
>_______________________________________________
>Mailing list: https://launchpad.net/~yade-users
>Post to : <email address hidden>
>Unsubscribe : https://launchpad.net/~yade-users
>More help : https://help.launchpad.net/ListHelp

Revision history for this message
Jérôme Duriez (jduriez) said : 		#3

Hello

To get more info about Segmentation fault, try to launch this script with a debug version of Yade (make a new compilation for that)

Revision history for this message
Liqing Jiao (liqing) said : 		#4

Dear All,

Thank Jduriez for the reply very quickly!
I think my yade version is newest that is yade-0.60.2. So I don't know how to solve this problem. Do you see this problem or error information when you run yade? Thank you!

Cheers
Liqing

At 2011-04-13，jduriez <email address hidden> wrote:

>Your question #152385 on Yade changed:
>https://answers.launchpad.net/yade/+question/152385
>
> Status: Open => Answered
>
>jduriez proposed the following answer:
>Hello
>
>To get more info about Segmentation fault, try to launch this script
>with a debug version of Yade (make a new compilation for that)
>
>--
>If this answers your question, please go to the following page to let us
>know that it is solved:
>https://answers.launchpad.net/yade/+question/152385/+confirm?answer_id=2
>
>If you still need help, you can reply to this email or go to the
>following page to enter your feedback:
>https://answers.launchpad.net/yade/+question/152385
>
>You received this question notification because you are a direct
>subscriber of the question.

Revision history for this message
Bruno Chareyre (bruno-chareyre) said : 		#5

Hi,

I tried your script with a recent version (not sure what would happen in 0.6). It gave me this:

DeprecationWarning: Class `Ip2_2xCohFrictMat_CohFrictPhys' was renamed to (or replaced by) `Ip2_CohFrictMat_CohFrictMat_CohFrictPhys', update your code! (you can run 'yade --update script.py' to do that automatically)
DeprecationWarning: Class `Law2_ScGeom_CohFrictPhys_CohesionMoment' was renamed to (or replaced by) `Law2_ScGeom6D_CohFrictPhys_CohesionMoment', update your code! (you can run 'yade --update script.py' to do that automatically)

So, I ran "yade --update yourScript.py", and then Interaction loop looked like this:

InteractionLoop(
        [Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
        [Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=False,setCohesionOnNewContacts=True)],
        [Law2_ScGeom6D_CohFrictPhys_CohesionMoment()]
    ),

At that point the type mismatch is obvious: ScGeom are generated while the contact law needs ScGeom6D. Actually, using substepping in the qt window, there is a clear error message (not sure why we don't have this output when a full step is done...):

"None of given Law2 functors can handle interaction #3677+0, types geom:ScGeom=1 and phys:CohFrictPhys=6"

It is possible that yade0.6 is still using the old misleading names, I'd have to check. I recommend using the last bzr version, then with this loop, your script works:

InteractionLoop(
        [Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Box_Sphere_ScGeom6D()],
        [Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=False,setCohesionOnNewContacts=True)],
        [Law2_ScGeom6D_CohFrictPhys_CohesionMoment()]
    ),

Revision history for this message
Liqing Jiao (liqing) said : 		#6

Dear Chareyre,

Thank you for your reply and warm help.
I followed what you said to change my code. But it also can't run, and give me the error like this:

Welcome to Yade 0.60
TCP python prompt on localhost:9000, auth cookie `asudes'
XMLRPC info provider on http://localhost:21000
Running script 16-09-re-3d.py
Traceback (most recent call last):
  File "/home/jiaoliqing/YADE/bin/yade", line 152, in runScript
    execfile(script,globals())
  File "16-09-re-3d.py", line 35, in <module>
    [Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=False,setCohesionOnNewContacts=True)],
NameError: name 'Ip2_CohFrictMat_CohFrictMat_CohFrictPhys' is not defined
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view, F10 both, F9 generator, F8 plot. ]]
Yade [1]:

It looks like the Ip2 file is not suitable. I also saw the Ip2_2xCohFrictMat_CohFrictPhys in the install files. I think maybe it is not the cause of that problem. Could you help me to check it again?

Cheers
Liqing

At 2011-04-13，Chareyre <email address hidden> wrote:

>Your question #152385 on Yade changed:
>https://answers.launchpad.net/yade/+question/152385
>
> Status: Open => Answered
>
>Chareyre proposed the following answer:
>Hi,
>
>I tried your script with a recent version (not sure what would happen in
>0.6). It gave me this:
>
>DeprecationWarning: Class `Ip2_2xCohFrictMat_CohFrictPhys' was renamed to (or replaced by) `Ip2_CohFrictMat_CohFrictMat_CohFrictPhys', update your code! (you can run 'yade --update script.py' to do that automatically)
>DeprecationWarning: Class `Law2_ScGeom_CohFrictPhys_CohesionMoment' was renamed to (or replaced by) `Law2_ScGeom6D_CohFrictPhys_CohesionMoment', update your code! (you can run 'yade --update script.py' to do that automatically)
>
>So, I ran "yade --update yourScript.py", and then Interaction loop
>looked like this:
>
>InteractionLoop(
> [Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
> [Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=False,setCohesionOnNewContacts=True)],
> [Law2_ScGeom6D_CohFrictPhys_CohesionMoment()]
> ),
>
>At that point the type mismatch is obvious: ScGeom are generated while
>the contact law needs ScGeom6D. Actually, using substepping in the qt
>window, there is a clear error message (not sure why we don't have this
>output when a full step is done...):
>
>"None of given Law2 functors can handle interaction #3677+0, types
>geom:ScGeom=1 and phys:CohFrictPhys=6"
>
>It is possible that yade0.6 is still using the old misleading names, I'd
>have to check. I recommend using the last bzr version, then with this
>loop, your script works:
>
>InteractionLoop(
> [Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Box_Sphere_ScGeom6D()],
> [Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=False,setCohesionOnNewContacts=True)],
> [Law2_ScGeom6D_CohFrictPhys_CohesionMoment()]
> ),
>
>--
>If this answers your question, please go to the following page to let us
>know that it is solved:
>https://answers.launchpad.net/yade/+question/152385/+confirm?answer_id=4
>
>If you still need help, you can reply to this email or go to the
>following page to enter your feedback:
>https://answers.launchpad.net/yade/+question/152385
>
>You received this question notification because you are a direct
>subscriber of the question.

Revision history for this message
Bruno Chareyre (bruno-chareyre) said : 		#7

Then you are still using a version where Ip2_2xCohFrictMat_CohFrictPhys
is not yet renamed Ip2_CohFrictMat_CohFrictMat_CohFrictPhys.
Just replace new name by old name (or use the same "yade --update
yourOldScript.py" method that I showed in previous reply).
You should seriously consider installing last bzr revision to avoid this
sort of problems.

Revision history for this message
Yade Guide (yade-guide) said : 		#8

Hey there! As an automated bot, I've scanned through some relevant threads and compiled a summary for you. Feel free to explore these topics further by clicking on the links below!

Title: "Segmentation fault (core dumped) Engines"
User encounters a segmentation fault when adding multiple instances of TranslationEngine to O.engines; Jan suggests modifying the code to resolve the issue.
https://answers.launchpad.net/yade/+question/694054

Title: "segmentation fault"
A user encounters a segmentation fault while running Yade 1.07.0 on Ubuntu 14.04 after 60,000 iterations. They have attempted various troubleshooting methods and are recommended to submit a bug report with their script and gts files attached for further assistance.
https://answers.launchpad.net/yade/+question/252356

Title: "Segfault when from scipy import interpolate is used"
Jouny encountered a segmentation fault when running a script in Yade 1.10 with 'from scipy import interpolate'. The issue might be due to name conflicts or other issues. Bruno suggested using the '-l' option at startup as a workaround, which changes the order of imports. This is a known issue (google(yade scipy)) and can be found in #5 of [1](https://bugs.launchpad.net/yade/+bug/1183402). Jouny's question was resolved with Chareyre's suggestion.
https://answers.launchpad.net/yade/+question/261912

Can you help with this problem?

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