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.
		Unarmed Combat	The arm.
	Hats	Hero's Tail	The ponytail.
Soldier	Weapons	Black Box	The flap on the back.
		Buff Banner	The flag.
		Disciplinary Action	The leather loop.
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.
		Birdcage	The cage door and perch.
		Flamboyant Flamenco	The skulls.
	Misc.	Stockbroker's Scarf	The tie.
		Sight for Sore Eyes	The pupils.
		Cremator's Conscience	The dolls.
		Fallen Angel	The wings.
		Tail From the Crypt	The tail.
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.
		Buccaneer's Bicorne	The feather.
Heavy	Hats	Coupe D'isaster	The toupee.
		Pugilist's Protector	The straps.
		Gym Rat	The quiff.
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.
	Misc	Surgeon's Stethoscope	The tube.
		Dr. Gogglestache	The flaps.
		Emerald Jarate	The neon liquid and antennae.
Sniper	Weapons
		Darwin's Danger Shield	The crocodile's tail.
	Hats	Swagman's Swatter	The corks.
	Misc	Crocodile Smile	The teeth.
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.
		Spiral Sallet	The plume on the back.
		Full Head Of Steam	The pressure gauge.
		B.M.O.C.	The pom-pom.
	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, some items with jigglebones will appear to be fixed at their furthest position during movement. Whilst in this position they seem to vibrate.
• Items that can jiggle in a circular motion, such as the Holy Mackerel, may twist themselves in impossible ways, making the item appear X-shaped.

Notes

• Jigglebones will be automatically frozen below a given framerate (45 fps by default), set by cl_jiggle_bone_framerate_cutoff.

External links

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