CellCulture.txt example does not work

[kofideh]

Simulation question

Hello:
When attempt to run the CellCulture.txt example in examples/geometry/cells, I get the error below. Does anyone have this experience? Any suggested solutions?

Thanks

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomVol1002
issued by : G4PVPlacement::CheckOverlaps()
Overlap with volume already placed !
Overlap is detected for volume MyCulture/Cell1:1 (G4Orb) with MyCulture/Cell0:0 (G4Orb)
overlap at local point (0.00062449,0.000585965,0.000192178) by 3.44235 um (max of 282 cases)
NOTE: Reached maximum fixed number -1- of overlaps reports for this volume !
*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

**** Finding new position for volume Cell : 1 ****
^C
Session terminated.

-------- EEEE ------- G4Exception-START -------- EEEE -------
*** G4Exception : UI0001
issued by : G4UIterminal::SignalHandler()
KeyboardInterrput with Ctrl-C
*** Fatal Exception *** core dump ***
**** Track information is not available at this moment
**** Step information is not available at this moment

-------- EEEE -------- G4Exception-END --------- EEEE -------

*** G4Exception: Aborting execution ***
/home/kofi/shellScripts/topas: line 6: 45055 Aborted (core dumped) ~/Applications/TOPAS/OpenTOPAS-install/bin/topas $1

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[jschuemann]

The exception message is just a warning, as it says:
*** This is just a warning message. ***

The code tries to place the cells, checks for overlap with already placed cells, and if they overlap, exists, it:
**** Finding new position for volume Cell : 1 ****

Depending on the number of cells and volume size, this may take a long time. You can change how often you see this message if you want to follow the placements.

[kofideh]

Thank you for your response and suggestion, @jschuemann. The problem is, even after I set i:Ge/MyCulture/NumberofCells = 2, topas never concludes. I left it to run for 8 hours and it is still running. The only time topas concludes is for i:Ge/MyCulture/NumberofCells = 1. All other times, it seems to enter an infinite loop. I am using the current version of topas nbio, so it's puzzling why this is happening.

[JoseRamosMendez]

This could happen if the size of the envelope geometry is rather small so that the algorithm will take a lot of iterations, more likely falling very close to any previously accepted cell. If the space is too tight, you could instead position the cells by hand.

[kofideh]

Thanks, @JoseRamosMendez. I just positioned the cells manually as you suggested.