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Alright, I figured it out. The point cloud was hooked up to the wrong frame. I translated the points to the global frame before. Now I've put them into the frame of the robot, changing the translation accordingly and it's working. My robot now detects obstacles farther away than 2.5 meters from /odom
(about 2.5 meters from /base_link
that is, which is my robot's base frame).