[Gate-users] Track stuck or not moving

[Howard]

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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