Output path issue

[stig-atle]

When manually setting the output directory (as opposed to choosing it with the dialog), when you don't append a / then the exporter will create new directories ply and textures whose names start with the name of the base directory, so e.g. if output dir is /Username/pbrt then the plugin will create /Username/pbrtply and /Username/pbrttextures instead of /Username/pbrt/ply.

See here:

[stig-atle]

there is also a issue when relative paths are enabled when selecting export folder. check the logic for the path with that in mind too.