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Re: [sumo-user] SUMO vehicle context subscriptions
You can use vehicle.getLeader and vehicle.subscribeLeader.

Am So., 13. Dez. 2020 um 19:30 Uhr schrieb Hriday Sanghvi <sanghvih@xxxxxx>:
Hello Jakob, thank you for the update. I was actually trying to figure out which car is in the "front" and which car is in the "back" during a collision, since I need to manipulate the speeds based on that. What I am doing in the case where the vehicles collide when they are on the same lane, is using lane position to figure out the ordering. But for cases where the cars collide while they are on different edges (and hence different lanes), I have still not come up with a workaround. Tried using addSubscriptionFilterLeadFollow but it did not detect any of the vehicles. Any suggestions?

Thank you.

Sincerely,
Hriday.

On Sat, 12 Dec 2020 at 16:44, Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:
Sorry, this isn't yet working (https://github.com/eclipse/sumo/issues/7648).
Subscribe to this issue to be noticed when it is implemented.

Am Do., 10. Dez. 2020 um 18:54 Uhr schrieb Hriday Sanghvi <sanghvih@xxxxxx>:
Hello Jakob,

Thank you so much for your reply! I am trying to use the traci constant DISTANCE_REQUEST in order to be able to verify the distance between two vehicles by air/driving but I need to be able to pass some parameters to it. From what I see in subscribeContext's function signature, I think it would be passed to the "parameters" argument as per the doc. How do I find out what data type/structure it is passed as though? (For example, as a dictionary?). Could you please point me to the right resource/link? I really appreciate your help and feedback!

Thank you.
Sincerely,
Hriday. 

On Thu, 10 Dec 2020 at 09:42, Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:
Hello,

addSubscriptionFilterFieldOfVision must be set directly after a call to vehicle.subscribeContext. It will use the range of that subscription and filter it by angle.

1) upstream and downstream dist are measured in m along the route of the vehicle
2) unfortunately, no.
3) Filters are meant to be combined so that each filter can further reduce the set of returned vehicles.

regards,
Jakob

Am Mi., 9. Dez. 2020 um 19:56 Uhr schrieb Hriday Sanghvi <sanghvih@xxxxxx>:
Hello Jakob,

Thank you for your response. I have tried using addSubscriptionFilterCFManeuver instead of addSubscriptionFilterFieldOfVision since the latter only mentioned an "angle" and not a range. I also tried using addSubscriptionFilterTurn.

I receive an empty result in my subscriptions after addSubscriptionFilterTurn and end up with a TraCI connection error. For addSubscriptionFilterCFManeuver, I also get an empty result in subscriptions unless I set an absurdly high downstreamDist value like 1000. With regard to that, I just wanted to clarify the following if possible:

1. Is the downstreamDist a radial range/distance measured in metres in the direction towards the route that the ego vehicle is following?
2. Is there any way to "highlight" the range/distance using sumo-gui so I can see what it will and will not detect?
3. I think it is possible to chain multiple filters line by line? - I tried it and there was no error as such, but I just need a confirmation on this? Does it add an additional filter or overwrite the existing filter you set?

Thank you.
Sincerely,
Hriday.

On Tue, 8 Dec 2020 at 16:19, Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:
Hello,
the ssm device currently does not expose the conflict-related vehicles. Hower you could use

addSubscriptionFilterFieldOfVision to get all vehicles within a given range and angle
or
addSubscriptionFilterTurn which returns foe vehicles on and approaching upcoming junctions along the route of the ego vehicle.

regards,
Jakob

Am Di., 8. Dez. 2020 um 14:03 Uhr schrieb Hriday Sanghvi <sanghvih@xxxxxx>:
Hello,

I am a 2nd year PhD student at Trinity College Dublin, but I am new here.

I am trying to set a range on vehicles such that they detect the presence of any vehicle "X" metres in front of them. I am currently using a context subscription on each vehicle with a LaneFilter applied, setting downstreamDist to a value. ( https://sumo.dlr.de/daily/pydoc/traci._vehicle.html#VehicleDomain-addSubscriptionFilterLanes ). However, this does not seem to detect the vehicles "X" metres in a radial distance ( https://sumo.dlr.de/docs/TraCI/Interfacing_TraCI_from_Python.html#context_subscription_filters ) in the case where the vehicles meet each other at the intersection at a perpendicular angle.

It seems that using an SSM device would be ideal in this case, since it lists out all the information I might require ( https://sumo.dlr.de/docs/Simulation/Output/SSM_Device.html#encounter_types ). I am not able to figure out how to get this information dynamically though. Please advise.

Thank you.
Sincerely,
Hriday
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