There seems to be huge inconsistency in unit 4 of TFROS101?

There are 2 instances where the tutorial says one output but that’s not reflected in simulation.

Instance 1:Here Exercise 3.1a has some inconsistency
step1->roslaunch pi_robot_pkg pi_robot_control_norsp.launch
step2->rostopic pub /pi_robot/head_tilt_joint_position_controller/command std_msgs/Float64 “data: 0.0”
rostopic pub -1 /pi_robot/head_pan_joint_position_controller/command std_msgs/Float64 “data: 0.7”
step3->rosrun rviz rviz
The notebook says i should see a 3D object in rviz but i dont see anything its blank ?

Instance 2: at END of exercise 3.2 the output of rqt_tf_tree should be such that i should get disjointed link as the notebook says
However, I am getting a complete link there seems to be no issue, problem is the next tutorial focuses on removing the error as claimed in the notebook at end of exercise 3.2.


I reset the workspace and that solved the problem.