Carla ue5-dev 0.10.0 Content authoring - vehicles - How to manage Vehicle Factory Params

[ali-0-1]

• Built from source Carla ue5-dev

• Ubuntu 22.04

• Planning to add a rover robot with tracks as a vehicle to test in the Carla environment, before this, experimented with earlier performed tutorial

• followed these documentations and tutorial

• https://carla-ue5.readthedocs.io/en/latest/tuto_content_authoring_vehicles/#importing-into-unreal-engine main documentation for ue5-dev

• [Haowei Zhang]https://www.youtube.com/watch?v=0F3ugwkISGk followed this to benefit but this is performed with UE4

• https://carla.readthedocs.io/en/latest/tuto_A_add_vehicle/ used this to compare steps and understand approaches

It seems documentation is missing the part that explains how to add the vehicle and the parameters to the Vehicle Actor Factory and Vehicles Params in vehicle blueprint class.

Also these part of the documentation could not be implemented:

• In the components panel, select Custom Collision (Inherited) search for the raycast sensor mesh that you imported (we did not import such and in our component panel the name appears as Custom Collision without (Inherited) same is true for Mesh (VehicleMesh), if that sounds normal)

• Modify the Physics Constraints components of the blueprint adding the respective components names (did not get what that means, under Constraints there exist: for both Lock Position and Rotation x,y,z values, and Mode selection)

We filled those parts by experimenting as in the image below, we can spawn vehicle to the map, it does not touch to the ground and it seems some settings are missing.

Once we print blue print libraries for debugging, we see the vehicle blue print in the list.

Once try to run with python3 manual_control.py --filter 'vehicle.unimog.*' we are getting
"""
blueprint.set_attribute('role_name', self.actor_role_name)
RuntimeError: std::exception

"""

Has anyone added a vehicle to ue5-dev?
How the vehicle name and parameters are managed in vehicle blueprint class?
Any help or idea will be appreciated!

[ali-0-1]

UPDATE:

So we printed out all attributes of a reference vehicle (lincoln.mkz) then modified Content / Carla/ Blueprints/ Vehicles/ BP_VehicleFactory/ Details/ Definitions, Variations and Attributes, by experimenting until to get as same as the blueprint of our vehicle (unimog) as seen below. Indeed we got them. Without manually adding vehicle to BP_VehicleFactory, we could not get the vehicle in to blueprint library.

Attributes of added vehicle and reference vehicle:

How vehicle visible on Carla map (Town10):

We can spawn the vehicle even with manual control by python3 manual_control.py --filter 'vehicle.unimog.*' but

• the vehicle does not touch to the ground, stay 1m height,
• pushing gas (throttle) and steering reacts on pygame window left hand dashboard but not on the actual vehicle,
• vehicle remains on the gear 'N' always

How vehicle looks like from pygame window:

Also if any one has an idea why the pygame is so dark, lacking light, is this due to lacking weather class or lacking some settings. Not directly related to this topic, it is same for all vehicles.

Some values from Vehicle Actor Factory
Also wondering what is the difference between Variations and Attributes because both are printed as attributes.

I wonder if documentation is lacking some part on Content authoring - vehicles and something wrong with physics. We compared both physics of our vehicle and Lincoln side by side they are almost identical.
Would anyone has any idea or feedback?
Thanks in advance!

[ali-0-1]

Instead of creating a new BP_ in Blueprint/ Vehicle/ TestVehicle, copied the existing BP_LincolnMKZ (reference vehicle that exists in Carla) and modified its name, Animation, Mesh and Wheel Setups etc. If kept the previous BP_ , also change the classes from BP_VehicleFactory --> Definitions and Vehicles Params.
Definitely documentation needs to be updated...