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They are defined in Python.

What ROS distro are you using? For Groovy on Ubuntu, those files should be in /opt/ros/groovy/lib/python2.7/dist-packages/pcl/msg/.

How did you import the message definitions? Something like this?

from pcl.msg import ModelCoefficients

They are defined in Python.

What ROS distro are you using? For Groovy on Ubuntu, those files should be in /opt/ros/groovy/lib/python2.7/dist-packages/pcl/msg/.

How did you import the message definitions? Something like this?

from pcl.msg import ModelCoefficients

Did you declare your dependency on the pcl package?

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