# Specifying a trajectory for a quadrotor simulated in Gazebo [closed]

Hi everybody, as the title states I'm simulating a quadrotor in gazebo and I want it to follow a circular trajectory. In the quadrotor model file it's written:

>"...
> This robot will subscribe the following nodes, according to the
>     selected control input
>        /\${model_name}/input/position   (if <selectInput>position</selectInput>)
>          this is a six value vector (geometry_msgs/Twist) containing current
>          and desired position coordinates (x, y, z, x_des, y_des, z_des).
>          You can test this type of input by executing rotopic on a terminal: