Jiggle bones

Jiggle bones are a feature of the Source Engine that allow a model skeleton to bounce or wiggle realistically with the object it is attached to. The effect is calculated and rendered in real time, giving a more realistic depiction of the way the part would move. Jiggle bones are used frequently on several items in Team Fortress 2 to add to their appearance.

Objects that use jiggle bones

The Hustler's Hallmark's jiggle bones.

Class	Type	Object	Location of jiggle bones
Scout	Weapons	Mad Milk	The milk inside the bottle.
		Holy Mackerel	The fish.
	Hats	Hero's Tail	The ponytail.
Soldier	Weapons	Black Box	The flap on the back.
		Buff Banner	The flag.
		Disciplinary Action	The leather loop.
	Hats	Spiral Sallet	The plume on the back.
Pyro	Hats	Connoisseur's Cap	The entire hat.
		Handyman's Handle	The wooden handle.
		Napper's Respite	The tip of the hat.
		Respectless Rubber Glove	The glove's fingers.
		Triboniophorus Tyrannus	The entire creature.
		Stately Steel Toe	The entire boot.
	Misc.	Stockbroker's Scarf	The tie.
		Sight for Sore Eyes	The pupils.
Demoman	Hats	Hustler's Hallmark	The feather.
		Sober Stuntman	The straps.
		Conjurer's Cowl	The tail of the hood.
		Mask of the Shaman	The hair-like tendrils.
Heavy	Hats	Coupe D'isaster	The toupee.
		Pugilist's Protector	The straps.
Engineer	Misc.	Teddy Roosebelt	The bear's head.
		Googly Gazer	The eye.
Medic	Weapons	Vita-Saw	The liquid within the container.
		Quick-Fix	The liquid within the nozzle.
	Hats	Doctor's Sack	The entire ice-pack.
Sniper	Weapons	Darwin's Danger Shield	The crocodile's tail.
All classes	Hats	A Rather Festive Tree	The tree.
		Alien Swarm Parasite	The tail.
		Max's Severed Head	The ears.
		Treasure Hat	The chest's lid.
	Misc.	Companion Cube Pin	The cube.
		Earbuds	The cords.
		Resurrection Associate Pin	The cube.
NPC	N/A	Horseless Headless Horsemann	The Horsemann's cape.

Bugs

• Currently, all jigglebones will appear fixed at their furthest position during movement. Whilst in this position they seem to vibrate.

Trivia

• Jigglebones will be automatically frozen below a given framerate (45 fps by default), set by cl_jiggle_bone_framerate_cutoff.
• The Spy is the only character who doesn't have personal items with jigglebones.

External links

• $jigglebone on the Valve Developer Community – technical explanation of $jigglebone