Hello Jakob, Thank you for your reply. I was able to use subscribe Leader to get the required information. My only question is regarding the "dist" parameter which I read about here <https://sumo.dlr.de/pydoc/traci._vehicle.html#VehicleDomain-getLeader>. It states that
> The dist parameter defines the minimum lookahead, 0 calculates a lookahead > from the brake gap. 1. Is the *brake gap *mentioned here the same as *minGap *parameter? Note that the returned leader may be further away than the given dist and > that the vehicle will only look on its current best lanes and not look > beyond the end of its final route edge. 2. I'm not sure what kind of behaviour this would entail. When they say that the returned leader may be further away than the given dist - what are the cases when this happens? Is there any way to control it? Thank you for your help. Sincerely, Hriday. On Sun, 13 Dec 2020 at 22:18, Jakob Erdmann <[email protected]> wrote: > You can use vehicle.getLeader and vehicle.subscribeLeader. > > Am So., 13. Dez. 2020 um 19:30 Uhr schrieb Hriday Sanghvi <[email protected] > >: > >> 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 >> <https://sumo.dlr.de/pydoc/traci._vehicle.html#VehicleDomain-addSubscriptionFilterLCManeuver> >> 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 <[email protected]> >> 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 < >>> [email protected]>: >>> >>>> 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 >>>> <https://sumo.dlr.de/daily/pydoc/traci.domain.html#Domain-subscribeContext>. >>>> 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 <[email protected]> >>>> 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 < >>>>> [email protected]>: >>>>> >>>>>> Hello Jakob, >>>>>> >>>>>> Thank you for your response. I have tried using >>>>>> addSubscriptionFilterCFManeuver >>>>>> <https://sumo.dlr.de/daily/pydoc/traci._vehicle.html#VehicleDomain-addSubscriptionFilterCFManeuver> >>>>>> instead >>>>>> of addSubscriptionFilterFieldOfVision >>>>>> <https://sumo.dlr.de/daily/pydoc/traci._vehicle.html#VehicleDomain-addSubscriptionFilterFieldOfVision> >>>>>> since >>>>>> the latter only mentioned an "angle" and not a range. I also tried using >>>>>> addSubscriptionFilterTurn >>>>>> <https://sumo.dlr.de/daily/pydoc/traci._vehicle.html#VehicleDomain-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 <[email protected]> >>>>>> 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 < >>>>>>> [email protected]>: >>>>>>> >>>>>>>> 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 >>>>>>>> _______________________________________________ >>>>>>>> sumo-user mailing list >>>>>>>> [email protected] >>>>>>>> To unsubscribe from this list, visit >>>>>>>> https://www.eclipse.org/mailman/listinfo/sumo-user >>>>>>>> >>>>>>> _______________________________________________ >>>>>>> sumo-user mailing list >>>>>>> [email protected] >>>>>>> To unsubscribe from this list, visit >>>>>>> https://www.eclipse.org/mailman/listinfo/sumo-user >>>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> Hriday >>>>>> https://www.linkedin.com/in/hriday-sanghvi/ >>>>>> _______________________________________________ >>>>>> sumo-user mailing list >>>>>> [email protected] >>>>>> To unsubscribe from this list, visit >>>>>> https://www.eclipse.org/mailman/listinfo/sumo-user >>>>>> >>>>> _______________________________________________ >>>>> sumo-user mailing list >>>>> [email protected] >>>>> To unsubscribe from this list, visit >>>>> https://www.eclipse.org/mailman/listinfo/sumo-user >>>>> >>>> >>>> >>>> -- >>>> Hriday >>>> https://www.linkedin.com/in/hriday-sanghvi/ >>>> _______________________________________________ >>>> sumo-user mailing list >>>> [email protected] >>>> To unsubscribe from this list, visit >>>> https://www.eclipse.org/mailman/listinfo/sumo-user >>>> >>> _______________________________________________ >>> sumo-user mailing list >>> [email protected] >>> To unsubscribe from this list, visit >>> https://www.eclipse.org/mailman/listinfo/sumo-user >>> >> >> >> -- >> Hriday >> https://www.linkedin.com/in/hriday-sanghvi/ >> _______________________________________________ >> sumo-user mailing list >> [email protected] >> To unsubscribe from this list, visit >> https://www.eclipse.org/mailman/listinfo/sumo-user >> > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user > -- Hriday https://www.linkedin.com/in/hriday-sanghvi/
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