Skyrim Mod:Mod File Format/COLL

COLL records are "collision layers". A collision layer is essentially an invisible box around/near NPCs/objects/camera, indicating different kinds of checks if they collide with other boxes.

If a box of type A collides with a box of type B, and the formid of A is in the CNAM field of type B then some kind of action is triggered.

C	SubRecord	Name	Type/Size	Info
+	EDID	editorId	zstring	Editor id
+	DESC	unknown	lstring	Description (presumably for CK)
+	BNAM	unique id?	uint32	Unique id (within COLL), may be used instead of FormID to reference internally
+	FNAM	debug color	rgb	Debug Color
+	GNAM	flags	uint32	Flags 0x01 - Trigger Volume 0x02 - Sensor 0x04 - Navmesh Obstacle
+	MNAM	name	zstring	Name, always same as EDID
+	INTV	interactables count	uint32	Count of interactions in CNAM (if 0 then no CNAM field)
-	CNAM	interactables	formid[]	Collides with..., End-to-end COLL formids, total count INTV. Presumably these are to indicate if the 2 collide there is something to check/do.