Today I want to document a couple of issues I've had when animating for SexLab. Maybe someone can shed some light.

The first relates to head-tracking remaining active during scenes. It appears that if the game considers the PC to be behind the NPC during a scene, the NPC's spine malfunctions, causing them to gyrate and float whenever their spine bones are animated. The "bHeadTrackSpine" variable seems suspicious here. This is a clip of the issue:

We can disable the NPC's head-tracking by setting the "IsNPC" flag to 0 in the console (as shown), and while this fixes the floating, it will break the NPC unless reverted after the scene ends. This can probably be automated in SexLab by somebody with the know-how.
I have managed to circumvent the problem by messing with rotation scripts in SLAL's json file, but it's not ideal. This is apparently a long-standing bug.

The second issue has actors sinking through the "Noble Bed" when in use. I believe this is because Skyrim's beds are such different heights. I considered making a replacer to level them off, but there's probably an easier fix.

A couple of WIPs: