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.
Soldier	Weapons	Black Box	The flap on the back.
		Buff Banner	The flag.
Hats
	Defiant Spartan	The cheek protectors.
	Pyro	Hats	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.
Misc.		Stockbroker's Scarf	The tie.
		Sight for Sore Eyes	The eyes.
Demoman	Hats	Hustler's Hallmark	The feather.
		Sober Stuntman	The straps.
Heavy	Hats	Coupe D'isaster	The toupee.
		Pugilist's Protector	The straps.
Medic	Weapons	Vita-Saw	The liquid in the container.
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.
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.

External links

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