L ‘outer’ corner plus baseline, originally uploaded by northern_bites.

So I feel like I’ve gotten line “detection” and line “formation” to good places. Sadly that pink dot that looks like recognition of a corner joint is actually just an outlier. Landmark detection is the next chore: now that we have bunches of lines, how to figure out if these lines make a corner? And which corner? Oh, plenty more work to do.