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But I can't seem to import anything and visualize successfully.

RViz visualises data streams, not files, so in order for you to be able to have it visualise the output of your pointcloud processing, you'll have to publish those clouds on a topic.

But I can't seem to import anything and visualize successfully.

RViz visualises data streams, not files, so in order for you to be able to have it visualise the output of your pointcloud processing, you'll have to publish those clouds on a topic.


Edit (after posting your own code): if all you wanted was to publish a .pcd file (instead of the results of your 'manipulation' directly (ie: without going through the FS)), then the pcd_to_pointcloud node in the pcl_ros package would probably have been better.