Add collision to actor in Visual lander

[javizqh]

The actor does not have any collision. This is wrong ass the drone must land on top of the car.

Please follow the contributor guidelines if you want to open a PR to fix this issue

[manavsikkas]

Hi, I’m interested in working on this. Could you point me to the specific world/exercise and the actor/model involved, plus the usual steps to reproduce the missing-collision behavior? I’d like to reproduce it first before making changes.

[javizqh]

The exercise is "Visual lander" and the actor is the car. To reproduce it just run the exercise from Robotics Academy

[anshuman83-40]

I'm working on this in #813. Since Gazebo Harmonic ignores links inside actors, the car is replaced with a regular model that has collisions and follows the same waypoints using a small system plugin.

[manavsikkas]

I came across another issue while trying to solve this. The collision box of the car is made smaller than the visual so when the drone lands on to of the rigid car body it sinks in and lands midway inside the car. However, just doing that won't solve the issue. Still working on it.