[Gate-users] Track stuck or not moving

[Sveta]

Hi Howard,
Did you use an STL file with assigned activity?  We have not found the setup with an STL as a source and ended up with a voxelized phantom instead.  How did you do this?  
Thanks,

iSveta

> On Sep 23, 2019, at 3:26 AM, Howard <lomahu at gmail.com> wrote:
> 
> Hi Catherine,
> 
> I am not using a voxelized phantom, but instead using a "tessellated" volume in the STL form. That might be the problem. But why did this not happen when I ran less events (2x10^7 events)? I am also wondering if the extra long simulation time (~6000 mins for a very simple CT imaging setup) is due to this? Thanks a lot for your help!
> 
> Howard
> 
>> On Sun, Sep 22, 2019 at 10:07 PM Catherine Costa Oliveira da Silva <catherinecos at gmail.com> wrote:
>> Hi Howard,
>> 
>> I had the same problem as you. 
>> If you are using a voxelized phantom with the setting "ImageRegularParametrisedVolume", try to change for "ImageNestedParametrisedVolume".
>> 
>> Best Regards,
>> Catherine 
>> 
>>> Em dom, 22 de set de 2019 às 22:48, Howard <lomahu at gmail.com> escreveu:
>>> Hi Matthew and Svetlana,
>>> 
>>> Thank you for your replies. Can you a bit more specific about the production cuts? In the warning it says:
>>> 
>>> ......
>>> Trying pushing it of 1e-07 mm ...Potential overlap in geometry!
>>> 
>>> But I do not know what to change in my scripts though. I do not believe I have overlapping geometry since the same geometry was working totally fine when I tried to generate 2x10^7 events. Still confused.
>>> 
>>> Howard
>>> 
>>>> On Sun, Sep 22, 2019 at 2:39 PM Matthew Strugari <matthew.strugari at dal.ca> wrote:
>>>> Have you verified that your geometry is not overlapping?
>>>> 
>>>> Matthew
>>>> 
>>>> On Sep 22, 2019, at 2:14 PM, Svetlana Shasharina <sveta at txcorp.com> wrote:
>>>> 
>>>>> Hi,
>>>>> 
>>>>> You would try to change production cuts to be a little bit bigger.  
>>>>> 
>>>>> Best,
>>>>> 
>>>>> Svetlana
>>>>> 
>>>>>> On 9/22/19 10:52 AM, Howard wrote:
>>>>>> Hi,
>>>>>> 
>>>>>> I was simulating a X-ray imaging process with 2 x 10^9 events. It has been running over 5200 minutes and still ongoing. From the output I saw the following warning message about "Track stuck or not moving" as attached below (multiple times). However, when I ran 2 x 10^7 events I did not have the same warming issue and the simulation was completed < 20 hours successfully. Should I worry about this warning or just ignore it and continue to wait? Thanks a lot!
>>>>>> 
>>>>>> Howard
>>>>>> 
>>>>>> -------- WWWW ------- G4Exception-START -------- WWWW -------
>>>>>> *** G4Exception : GeomNav1002
>>>>>>       issued by : G4Navigator::ComputeStep()
>>>>>> Track stuck or not moving.
>>>>>>           Track stuck, not moving for 10 steps
>>>>>>           in volume -world_phys- at point (-5.649999594721559,4.81816525126774,-38.09301491743752) (local point (-5.649999594721559,4.81816525126774,-38.09301491743752))
>>>>>>           direction: (0.6222482514791153,-0.3555437239478714,0.6974208011612956) (local direction: (0.6222482514791153,-0.3555437239478714,0.6974208011612956)).
>>>>>>           Potential geometry or navigation problem !
>>>>>>           Trying pushing it of 1e-07 mm ...Potential overlap in geometry!
>>>>>> 
>>>>>> *** This is just a warning message. ***
>>>>>> -------- WWWW -------- G4Exception-END --------- WWWW -------
>>>>>> 
>>>>>> 
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