A line prop works nicely, to display the path.  Neat!

It does require an import operation every time the line refreshes, but the geometry is so simple that it seems to be fast enough.

I do wonder if some people might encounter problems when using a script which tries to write and import (then delete) files in the background.  Possibly I should leave the boxes method in as a backup.

Poser cannot create a new line geometry using Python.  It automatically closes any polygon left open, foiling the effort to make lines.  Bah.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.