I had limited time to work today, but I managed to finish the scent trail shader and get hovering, right-clicking, ordering, and focusing trails to work. The entire system is much better-optimized now, and although people probably didn't notice the visual bugs with it before, it's 100% functional with shadows now as well. This was most of the hard work on Tracking. Tomorrow I'll work on getting the track age tooltip to show up, and sniffing and assigning colors, and then move on to Pickpocketing. The trails turn green in the below video for debugging purposes only to show that they respond to being hovered.

Behold the future of Tracking.