Modding:Entity Behaviors

Using Entity Behaviors

Inside the entity json file, entity behaviors can be added to the client section, server section, or both. For example, here is the controlledphysics behavior from deer.json, added to both the client and server sections. This shows the pre-1.20 style of including the behavior on both sides. Note that the properties are added directly to the behavior object, instead of in a properties object like with blocks and items. Also note that the builtin entity behavior names are all lower case, unlike block and collectible behaviors.

	client: {
        ...
		behaviors: [
            ...
			{
                code: "controlledphysics",
                "stepHeightByType": {
		    		"deer-pampas-*": 2.1251,
	    			"deer-pudu-*": 2.1251,
    				"deer-redbrocket-*": 2.1251,
				    "*": 3.1251
			    } 
            },
            ...
		],
        ...
	},
	server: {
        ...
		behaviors: [
            ...
			{
                code: "controlledphysics",
                "stepHeightByType": {
		    		"deer-pampas-*": 2.1251,
	    			"deer-pudu-*": 2.1251,
    				"deer-redbrocket-*": 2.1251,
				    "*": 3.1251
			    } 
            },
            ...
		],
        ...
	},

In 1.20, the behaviorConfigs section was added. For behaviors that added to both sections, the properties may be specified in the behaviorConfigs section to avoid duplicating the properties in both the client and server section. Here is the above example using behaviorConfigs.

	behaviorConfigs: {
		"controlledphysics": { 
			"stepHeightByType": {
				"deer-pampas-*": 2.1251,
				"deer-pudu-*": 2.1251,
				"deer-redbrocket-*": 2.1251,
				"*": 3.1251
			}
		},
        ...
	},
	client: {
        ...
		behaviors: [
            ...
			{ code: "controlledphysics" },
            ...
		],
        ...
	},
	server: {
        ...
		behaviors: [
            ...
			{ code: "controlledphysics" },
            ...
		],
        ...
	},

All Behaviors

Here is a table containing all the entity behaviors of the base game. Of course mods can, and are encouraged to add new behaviors.

Behavior Name	Explanation	Example entities	Properties	Side
aimingaccuracy	Adds aiming inaccuracy when sprinting, jumping, etc.	player playerbot		Server
breathe	The entity will need to breathe and therefore suffocate in other blocks (for example sand).	player most animals		Server
collectitems	The entity collections items laying around on the ground.	player bot racoon		Server
controlledphysics	Add physics to the entity.	most entities	stepHeight = 0.6	Universal
despawn	The entity will despawn under given circumstances.	most entities	minPlayerDistance belowLightLevel minSeconds = 30	Server
emotionstates	Adds emotion states with a given chance. As an example, it can be used to make an animal "hungry" (aggressive) and "saturated" (passive).	most animals most humanoids	states	Server
floatupwhenstuck	Float up the entity if it gets stuck in a block.	item most animals	onlyWhenDead = false pushVelocityMul = 1	Universal
grow	The entity will grow and eventually turn into one of its adults.	pig-wild-piglet most baby animals	hoursToGrow = 96 adultEntityCodes = []	Server
health	Applies custom health to the entity. Means the entity can be hurt as well.	bear most entities	currenthealth = 20 maxhealth = 20 basemaxhealth = 20	Server
hunger	Adds saturation and hunger, the entity needs to eat in order to stay alive.	player	currentsaturation = 1200 maxsaturation = 1200 saturationlossdelay = 60 * 24 currentfruitLevel = 0 currentvegetableLevel = 0 currentgrainLevel = 0 currentproteinLevel = 0 currentdairyLevel = 0	Server
interpolateposition	Interpolates entity position and rotate. Smooths out the animations. It's a visual effect, therefore not available on server side.	most entities		Client
multiply	A pack of wolves for example grows in size over time (new babies are born).	wolf-female most female animals	pregnancyDays = 3.0 spawnEntityCode requiresNearbyEntityCode requiresNearbyEntityRange = 5 multiplyCooldownDaysMin = 6 multiplyCooldownDaysMax = 12 portionsEatenForMultiply = 3 spawnQuantityMin = 1 spawnQuantityMax = 2 requiresFood = true	Server
nametag	Adds a name tag to the entity which will be displayed above the entity.	player playerbot trader villager	renderRange = 99 selectFromRandomName showtagonlywhentargeted = false	Universal
passivephysics	Adds physics to the entity.	item thrownstone most projectiles	waterDragFactor = 1 airDragFallingFactor = 1 groundDragFactor = 1 gravityFactor = 1	Universal
placeblock	The entity will place one of the given block codes from time to time.	hen - prior to 1.15 update	minHourDelay = 8 * 24 maxHourDelay = 15*24 blockCodes = []	Server
playerphysics	Makes an entity controllable by a player. Because this inherits from controlledphysics, do not add both to an entity.	player	stepHeight = 0.6	Universal
repulseagents	Pushes other entities back.	most entities	movable = true	Universal
taskai	Allows you to specify tasks.	most entities	aitasks	Server
tiredness	The entity will get tired over time. When it is sufficiently tired, it may sleep in a bed.	player	currenttiredness = 0	Universal