Available Drone Models

[nyakotey]

In the paper branch, the hummingbird drone model is available, and the reference paper is given in your publication.
The current main branch does not have this model. Any reason behind the removal?
The new drone model introduced in main is racer. It seems to be a larger version of c2fx per the urdf. If that's not all there is to it, kindly provide the reference paper for this drone model

[JacopoPan]

Hi @nyakotey

there was no specific reason to remove the Hummingbird model other than the fact that I did not have access to a physical one so all the parameters in the .URDF were only based on what I could find in the literature.
The racer drone is based (at least w.r.t. to mass, size, and motor constants) on the drone use in this paper: https://arxiv.org/pdf/2311.02667

[Ziad-Shoeib]

When I try to choose racer as the URDF choice in the drone model in pid.py or pid_velocity.py, I get this error:

Traceback (most recent call last):
  File "/home/ziad/gym-pybullet-drones/gym_pybullet_drones/examples/pid.py", line 199, in <module>
    run(**vars(ARGS))
  File "/home/ziad/gym-pybullet-drones/gym_pybullet_drones/examples/pid.py", line 143, in run
    action[j, :], _, _ = ctrl[j].computeControlFromState(control_timestep=env.CTRL_TIMESTEP,
UnboundLocalError: local variable 'ctrl' referenced before assignment

[JacopoPan]

When I try to choose racer as the URDF choice in the drone model in pid.py or pid_velocity.py, I get this error:

Traceback (most recent call last):
File "/home/ziad/gym-pybullet-drones/gym_pybullet_drones/examples/pid.py", line 199, in
run(**vars(ARGS))
File "/home/ziad/gym-pybullet-drones/gym_pybullet_drones/examples/pid.py", line 143, in run
action[j, :], _, _ = ctrl[j].computeControlFromState(control_timestep=env.CTRL_TIMESTEP,
UnboundLocalError: local variable 'ctrl' referenced before assignment

see the comment I left in #104, it's the same issue