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Hello, I've been having the same sort of trouble as was originally posted - I've read this thread through but I'm new enough to ROS that I'm not sure what I ought to do. Here's my situation:

I'm using an inverted Hokuyo scanner at the center front of my robot, with ROS electric and an ASUS netbook. I've tried setting the transform to show gmapping that the laser is inverted by editing the transform from the laser to the base. I've tried changing yaw, pitch, and roll by 3.14 and by 180, I've tried changing them all separately and in combinations, all to no avail. I'm not sure from the patches listed here how to approach this - would someone be so kind as to give me a summary of guidelines?