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This is a quick tip on how to change turtlebot3_waffle's camera pitch, so that the camera (in simulation) can look down or up
Find this section of "Vision Camera" in turtlebot's urdf:
And you can modify ${-cam_pitch} to any angle you want.
<joint name="camera_joint" type="fixed"> <origin xyz="0 0 ${1+base_height}" rpy="0 ${-cam_pitch} 0" /> <parent link="base_link"/> <child link="camera_link" /> </joint>