# Latest **URL:** https://forum.scenic-lang.org/latest.md [Latest](https://forum.scenic-lang.org/latest.md) · [Categories](https://forum.scenic-lang.org/categories.md) · [Tags](https://forum.scenic-lang.org/tags.md) --- ## [Welcome to the Scenic Community! 👋](https://forum.scenic-lang.org/t/welcome-to-the-scenic-community/5)
**Author:** [@system](https://forum.scenic-lang.org/u/system)\ **Replies:** 0\ **Last updated:** [May 22, 2024, 11:05pm UTC](https://forum.scenic-lang.org/t/welcome-to-the-scenic-community/5 "2024-05-22T23:05:21Z")
We are so glad you joined us. Scenic Community Forum for users and developers of the Scenic scenario modeling language. Here are some things you can do to get started: :speaking\_head: Introduce yourself by adding yo… --- ## [Scenic Workshop 2026: August 20-21 @ UC Santa Cruz](https://forum.scenic-lang.org/t/scenic-workshop-2026-august-20-21-uc-santa-cruz/96)
**Author:** [@dfremont](https://forum.scenic-lang.org/u/dfremont)\ **Replies:** 0\ **Last updated:** [June 26, 2026, 5:35pm UTC](https://forum.scenic-lang.org/t/scenic-workshop-2026-august-20-21-uc-santa-cruz/96 "2026-06-26T17:35:35Z")
Hi folks, This year’s Scenic Workshop for current and potential users and developers of Scenic will be held at UC Santa Cruz on August 20-21. The workshop will include food and housing from dinner on August 19 through … --- ## [Naming of Minimum Distance Operator](https://forum.scenic-lang.org/t/naming-of-minimum-distance-operator/95)
**Author:** [@EricVin](https://forum.scenic-lang.org/u/EricVin)\ **Replies:** 0\ **Last updated:** [June 25, 2026, 9:26pm UTC](https://forum.scenic-lang.org/t/naming-of-minimum-distance-operator/95 "2026-06-25T21:26:32Z")
We are planning to add a new operator that can be used to compute the minimal distance between space occupied by two objects (accounting for shape, size, etc…). This is different from the current distance from X to Y ope… --- ## [Guidance to participate in SoR'26](https://forum.scenic-lang.org/t/guidance-to-participate-in-sor26/87)
**Author:** [@Dibyanshu](https://forum.scenic-lang.org/u/Dibyanshu)\ **Replies:** 1\ **Last updated:** [February 21, 2026, 10:29pm UTC](https://forum.scenic-lang.org/t/guidance-to-participate-in-sor26/87 "2026-02-21T22:29:44Z")
Hi Teams , This is Dibyanshu Pal Kushwaha , an open source enthusiast , please help me by providing the guidance to participate in the upcoming SoR’26 / Scenic projects . --- ## [Want to extract left conflictling maneuvers](https://forum.scenic-lang.org/t/want-to-extract-left-conflictling-maneuvers/85)
**Author:** [@Fida](https://forum.scenic-lang.org/u/Fida)\ **Replies:** 0\ **Last updated:** [November 26, 2025, 6:07pm UTC](https://forum.scenic-lang.org/t/want-to-extract-left-conflictling-maneuvers/85 "2025-11-26T18:07:17Z")
“”" TITLE: Intersection 03 AUTHOR: DESCRIPTION: Ego vehicle either goes straight or makes a left turn at 4-way intersection and must suddenly stop to avoid collision when adversary vehicle from lateral lane continue… --- ## [Controlling Traffic lights in CARLA with Scenic](https://forum.scenic-lang.org/t/controlling-traffic-lights-in-carla-with-scenic/83)
**Author:** [@VedaantJ](https://forum.scenic-lang.org/u/VedaantJ)\ **Replies:** 0\ **Last updated:** [November 10, 2025, 3:47am UTC](https://forum.scenic-lang.org/t/controlling-traffic-lights-in-carla-with-scenic/83 "2025-11-10T03:47:21Z")
I want to know if it is possible to control traffic lights in carla using scenic as I am not sure if this is possible. I am new to how Scenic works and would appreciate any help. --- ## [How to enable dynamic behaviors for composed scenarios?](https://forum.scenic-lang.org/t/how-to-enable-dynamic-behaviors-for-composed-scenarios/81)
**Author:** [@kcchang](https://forum.scenic-lang.org/u/kcchang)\ **Replies:** 1\ **Last updated:** [October 8, 2025, 10:55pm UTC](https://forum.scenic-lang.org/t/how-to-enable-dynamic-behaviors-for-composed-scenarios/81 "2025-10-08T22:55:08Z")
I’m trying to define a composing scenario in Scenic as follows. In the Main scenario, the ego vehicle is created with FollowLaneBehavior, and in the TrailingCar scenario, a trailing vehicle is created behind the ego, als… --- ## [Can list items be used in require statements?](https://forum.scenic-lang.org/t/can-list-items-be-used-in-require-statements/80)
**Author:** [@nethtrick](https://forum.scenic-lang.org/u/nethtrick)\ **Replies:** 0\ **Last updated:** [October 3, 2025, 10:04pm UTC](https://forum.scenic-lang.org/t/can-list-items-be-used-in-require-statements/80 "2025-10-03T22:04:16Z")
Hello, thank you for your work developing Scenic. I am trying to enforce a minimum distance between objects, but it seems I cannot use objects that are members of a list in a require statement. Ultimately I’d like to en… --- ## [Several driving actions are not implemented for the Metadrive simulator](https://forum.scenic-lang.org/t/several-driving-actions-are-not-implemented-for-the-metadrive-simulator/78)
**Author:** [@kcchang](https://forum.scenic-lang.org/u/kcchang)\ **Replies:** 1\ **Last updated:** [September 12, 2025, 5:36pm UTC](https://forum.scenic-lang.org/t/several-driving-actions-are-not-implemented-for-the-metadrive-simulator/78 "2025-09-12T17:36:51Z")
Several driving actions (e.g., SetReverseAction, SetSpeedAction, SetVelocityAction, etc.) are not implemented for the MetaDrive simulator. Here’s a sample code snippet: using the MetaDrive model results in a NotImplemen… --- ## [Scenic Workshop 2025: August 21-22 @ UC Santa Cruz](https://forum.scenic-lang.org/t/scenic-workshop-2025-august-21-22-uc-santa-cruz/75)
**Author:** [@dfremont](https://forum.scenic-lang.org/u/dfremont)\ **Replies:** 0\ **Last updated:** [August 6, 2025, 11:09pm UTC](https://forum.scenic-lang.org/t/scenic-workshop-2025-august-21-22-uc-santa-cruz/75 "2025-08-06T23:09:35Z")
Hi folks, This year’s Scenic Workshop for current and potential users and developers of Scenic will be held at UC Santa Cruz on August 21-22. The workshop will include food and housing from dinner on August 20 through … --- ## [How to allow collision avoidance behavior for only objects in its own lane](https://forum.scenic-lang.org/t/how-to-allow-collision-avoidance-behavior-for-only-objects-in-its-own-lane/72)
**Author:** [@arka](https://forum.scenic-lang.org/u/arka)\ **Replies:** 0\ **Last updated:** [June 30, 2025, 3:25pm UTC](https://forum.scenic-lang.org/t/how-to-allow-collision-avoidance-behavior-for-only-objects-in-its-own-lane/72 "2025-06-30T15:25:29Z")
I am specifying this collision avoidance behavior for when my ego vehicle behavior CollisionAvoidance(): while withinDistanceToAnyObjs(self, SAFETY\_DISTANCE): take SetBrakeAction(MAX\_BREAK\_THRESHOLD) How can I allow … --- ## [Braking for x seconds](https://forum.scenic-lang.org/t/braking-for-x-seconds/71)
**Author:** [@arka](https://forum.scenic-lang.org/u/arka)\ **Replies:** 0\ **Last updated:** [June 30, 2025, 1:51pm UTC](https://forum.scenic-lang.org/t/braking-for-x-seconds/71 "2025-06-30T13:51:34Z")
I want to have my ego car to drive at speed = 20 for the first 3 seconds, brake for 6 seconds and then again drive at speed = 50 for 4 seconds (using the Metadrive simulator) I know I can specify the ego car behavior wi… --- ## [Checking Scenic types in Python](https://forum.scenic-lang.org/t/checking-scenic-types-in-python/70)
**Author:** [@nethtrick](https://forum.scenic-lang.org/u/nethtrick)\ **Replies:** 0\ **Last updated:** [June 20, 2025, 12:17pm UTC](https://forum.scenic-lang.org/t/checking-scenic-types-in-python/70 "2025-06-20T12:17:44Z")
Hello, I’d like to use the equivalent of “isinstance” on Scenic types in Python. Is this possible? I have looked at some of the simulators and I see that I can add an attribute to each Scenic class for introspection. Is … --- ## [Can an object be sampled to be in each of two overlapping regions?](https://forum.scenic-lang.org/t/can-an-object-be-sampled-to-be-in-each-of-two-overlapping-regions/68)
**Author:** [@simplelife2010](https://forum.scenic-lang.org/u/simplelife2010)\ **Replies:** 5\ **Last updated:** [June 10, 2025, 1:07pm UTC](https://forum.scenic-lang.org/t/can-an-object-be-sampled-to-be-in-each-of-two-overlapping-regions/68 "2025-06-10T13:07:54Z")
Hi everybody, I have a PathRegion representing the centerline of a rail track. Now I want to define a CircularRegion overlapping the centerline and sample from all points that are on the centerline within the Circular… --- ## [Python API CARLA Simulator Not Working](https://forum.scenic-lang.org/t/python-api-carla-simulator-not-working/58)
**Author:** [@ekinbeyazit](https://forum.scenic-lang.org/u/ekinbeyazit)\ **Replies:** 1\ **Last updated:** [February 3, 2025, 9:47pm UTC](https://forum.scenic-lang.org/t/python-api-carla-simulator-not-working/58 "2025-02-03T21:47:01Z")
Hello, I can simulate any Scenic scenario through the command line, but when I use the Python API function i.e. simulator.simulate(scene) I get the following error: scenic.core.simulators.SimulationCreationError: Unable… --- ## [Pygame Scenarios keep crashing for Carla Simulators](https://forum.scenic-lang.org/t/pygame-scenarios-keep-crashing-for-carla-simulators/57)
**Author:** [@DeepayanSur](https://forum.scenic-lang.org/u/DeepayanSur)\ **Replies:** 0\ **Last updated:** [January 30, 2025, 3:46am UTC](https://forum.scenic-lang.org/t/pygame-scenarios-keep-crashing-for-carla-simulators/57 "2025-01-30T03:46:44Z")
Hi Guys, I am new to Scenic and have completed the setup procedure for Scenic and Carla. Now I have tried running the dynamic scenarios examples using this command: “scenic examples/driving/Carla\_Challenge/carlaChallen… --- ## [Parser for open drive files of CARLA](https://forum.scenic-lang.org/t/parser-for-open-drive-files-of-carla/48)
**Author:** [@alevy](https://forum.scenic-lang.org/u/alevy)\ **Replies:** 2\ **Last updated:** [January 9, 2025, 3:40pm UTC](https://forum.scenic-lang.org/t/parser-for-open-drive-files-of-carla/48 "2025-01-09T15:40:13Z")
Hello, I work on creating scenarios for Town 12 13 and 15 of Carla and it seems that there is a problem with the parser of Scenic for open drive files for the towns from 12 to 15. Should I redefine how this parser i… --- ## [The error that occurs when running the Carla example](https://forum.scenic-lang.org/t/the-error-that-occurs-when-running-the-carla-example/54)
**Author:** [@yxj](https://forum.scenic-lang.org/u/yxj)\ **Replies:** 0\ **Last updated:** [December 21, 2024, 3:05am UTC](https://forum.scenic-lang.org/t/the-error-that-occurs-when-running-the-carla-example/54 "2024-12-21T03:05:23Z")
I tried to run the example for Carla, but encountered some errors as shown below. How can I resolve this? (chatscene) robot@WP:~/桌面/Scenic$ scenic examples/carla/pedestrian.scenic --model scenic.simulators.carla.model -… --- ## [Sampling Object Shape Parameter](https://forum.scenic-lang.org/t/sampling-object-shape-parameter/52)
**Author:** [@Kai-Xu](https://forum.scenic-lang.org/u/Kai-Xu)\ **Replies:** 0\ **Last updated:** [December 15, 2024, 1:16am UTC](https://forum.scenic-lang.org/t/sampling-object-shape-parameter/52 "2024-12-15T01:16:31Z")
Hi, I am running a simulation where I have to vary the radius of some circular objects I am generating. I tried to do it like the following but it won’t work: class Agent: radius: Uniform(0.3, 0.5) shape: CylinderSha… --- ## [Recording variables](https://forum.scenic-lang.org/t/recording-variables/51)
**Author:** [@Jordttt](https://forum.scenic-lang.org/u/Jordttt)\ **Replies:** 0\ **Last updated:** [December 11, 2024, 3:46pm UTC](https://forum.scenic-lang.org/t/recording-variables/51 "2024-12-11T15:46:36Z")
I have a boolean variable that can be turned true by a self-defined behavior. I tried the record statement to record this variable, but it does not seem to change, even though I can see that the behavior does trigger a c… --- ## [Changing the camera position of Carla simulator](https://forum.scenic-lang.org/t/changing-the-camera-position-of-carla-simulator/50)
**Author:** [@JsSparkYyx](https://forum.scenic-lang.org/u/JsSparkYyx)\ **Replies:** 0\ **Last updated:** [November 21, 2024, 8:58pm UTC](https://forum.scenic-lang.org/t/changing-the-camera-position-of-carla-simulator/50 "2024-11-21T20:58:57Z")
How can I change the camera position if I want to record the front view of the ego vehicle? Should I manually modify /simulators/carla/similator.py? --- ## [Using SKlean decision tree in scenic](https://forum.scenic-lang.org/t/using-sklean-decision-tree-in-scenic/41)
**Author:** [@Jordttt](https://forum.scenic-lang.org/u/Jordttt)\ **Replies:** 2\ **Last updated:** [November 19, 2024, 10:51am UTC](https://forum.scenic-lang.org/t/using-sklean-decision-tree-in-scenic/41 "2024-11-19T10:51:49Z")
Is it possible to give python arguments to a scenic simulation, such as a decision tree from the SKlearn library, and then make a behavior dependent on the prediction from the decision tree? --- ## [Configuring Scenic for Realistic 3D Scene Generation](https://forum.scenic-lang.org/t/configuring-scenic-for-realistic-3d-scene-generation/43)
**Author:** [@Siqi](https://forum.scenic-lang.org/u/Siqi)\ **Replies:** 1\ **Last updated:** [November 15, 2024, 6:03pm UTC](https://forum.scenic-lang.org/t/configuring-scenic-for-realistic-3d-scene-generation/43 "2024-11-15T18:03:47Z")
Hello! I’m new to Scenic and would like to use it to generate realistic scenes similar to those shown on the first page of the Scenic paper. When I run the example scenes from the code, the output looks more like a 2D sk… --- ## [Running parallel behaviors](https://forum.scenic-lang.org/t/running-parallel-behaviors/46)
**Author:** [@ekinbeyazit](https://forum.scenic-lang.org/u/ekinbeyazit)\ **Replies:** 0\ **Last updated:** [November 15, 2024, 7:45am UTC](https://forum.scenic-lang.org/t/running-parallel-behaviors/46 "2024-11-15T07:45:59Z")
I am trying to run multiple sub-behaviors in parallel, using the syntax defined in the website: “do behavior/scenario,…” I get the following error: do can only take one action inside a behavior Here is an example to m… --- ## [Help with spawning vehicle at correct coordinates](https://forum.scenic-lang.org/t/help-with-spawning-vehicle-at-correct-coordinates/45)
**Author:** [@teoks0199](https://forum.scenic-lang.org/u/teoks0199)\ **Replies:** 0\ **Last updated:** [November 15, 2024, 7:30am UTC](https://forum.scenic-lang.org/t/help-with-spawning-vehicle-at-correct-coordinates/45 "2024-11-15T07:30:09Z")
Hello, we are working on the Scenic interface to BeamNG. This is the test scenario where we want to spawn a vehicle at (-717,111,118). This is the createObjectInSimulator function and ScenicVectorToCoordinates f… --- ## [Generate Pedestrian in Scenic](https://forum.scenic-lang.org/t/generate-pedestrian-in-scenic/39)
**Author:** [@Maple](https://forum.scenic-lang.org/u/Maple)\ **Replies:** 1\ **Last updated:** [October 25, 2024, 7:13pm UTC](https://forum.scenic-lang.org/t/generate-pedestrian-in-scenic/39 "2024-10-25T19:13:56Z")
I try to generate a pedestrain in carla map(Town10HD) in a specific position, eg(-36,118) and terminal would show some problem. Sometimes it show the objective is not in the container, but I could let it stand in the pos… --- ## [Placing objects either left or right](https://forum.scenic-lang.org/t/placing-objects-either-left-or-right/35)
**Author:** [@amolenaar](https://forum.scenic-lang.org/u/amolenaar)\ **Replies:** 2\ **Last updated:** [September 16, 2024, 1:32pm UTC](https://forum.scenic-lang.org/t/placing-objects-either-left-or-right/35 "2024-09-16T13:32:22Z")
Hi, for our (rail) scenarios, we want to place objects close to the (ego) track. Based on examples in the Scenic repo I came up with (simplified): ego = new Train spot = new OrientedPoint following ego\_track for Range(… --- ## [Is it possible to create a function that checks for non-Markovian state of an object in Scenic?](https://forum.scenic-lang.org/t/is-it-possible-to-create-a-function-that-checks-for-non-markovian-state-of-an-object-in-scenic/37)
**Author:** [@ek65](https://forum.scenic-lang.org/u/ek65)\ **Replies:** 0\ **Last updated:** [September 12, 2024, 8:54pm UTC](https://forum.scenic-lang.org/t/is-it-possible-to-create-a-function-that-checks-for-non-markovian-state-of-an-object-in-scenic/37 "2024-09-12T20:54:20Z")
I wish to create a helper function which checks whether an object (e.g. car) is consecutively moving towards a particular target object (e.g. pedestrian) over N time steps. Could you give an example of such code? --- ## [~Adding BeamNG~](https://forum.scenic-lang.org/t/adding-beamng/33)
**Author:** [@vanconywhale](https://forum.scenic-lang.org/u/vanconywhale)\ **Replies:** 1\ **Last updated:** [August 25, 2024, 5:34pm UTC](https://forum.scenic-lang.org/t/adding-beamng/33 "2024-08-25T17:34:34Z")
Any thoughts about interfacing Scenic into the BeamNG vehicle sim? My research group wants to use it for the Indy Autonomous Challenge. --- ## [VerifAI still requires hashable fields?](https://forum.scenic-lang.org/t/verifai-still-requires-hashable-fields/30)
**Author:** [@Kai-Xu](https://forum.scenic-lang.org/u/Kai-Xu)\ **Replies:** 1\ **Last updated:** [June 26, 2024, 5:42pm UTC](https://forum.scenic-lang.org/t/verifai-still-requires-hashable-fields/30 "2024-06-26T17:42:04Z")
Hi! Does the latest VerifAI version still require the attributes in classes of model.scenic to be hashable? I had some issue before where I couldn’t run the falsification due to some of my classes have simulator-specifi… [Next page](https://forum.scenic-lang.org/latest.md?page=1)