Triggers

Start() *Unity Documentation*

When: Activates once on the local client when the script/object is initialized and enabled.

Use Case: Initial setup logic, setting default values, or fetching references.

OnEnable() *Unity Documentation*

When: Activates when the GameObject or the UdonBehaviour component is enabled on the local client.

Use Case: Re-initializing state after an object is turned back on.

OnDisable() *Unity Documentation*

When: Activates when the GameObject or the UdonBehaviour component is disabled on the local client.

Use Case: Stopping continuous actions or releasing resources when the object is hidden.

Interact() *Udon Documentation*

When: Activates when the local player interacts (clicks/grabs) with the object.

Use Case: The standard "button press" trigger.

Requirements: The object requires a Collider component (non-trigger) and this function attached in the object's script.

OnPlayerJoined() *Udon Documentation*

When: Activates when a new player joins the instance.

Use Case: Spawning player-specific resources or welcoming the player.

OnPlayerLeft() *Udon Documentation*

When: Activates when a player leaves the instance.

Use Case: Cleaning up resources or updating player counts.

OnPlayerTriggerEnter() *Udon Documentation*

When: Activates when a player's capsule collider enters the object's trigger volume.

Use Case: Opening a door when a player walks near it.

Requirements: The object requires a Collider component with Is Trigger checked.

OnPlayerTriggerExit() *Udon Documentation* 

When: Activates when a player's capsule collider leaves the object's trigger volume.

Use Case: Closing a door when a player walks away.

Requirements: The object requires a Collider component with Is Trigger checked.

OnPlayerRespawn() *Udon Documentation* 

When: Activates when a player respawns (after falling into a kill barrier or being teleported by a respawn point).

Use Case: Resetting a player's state or inventory items upon death.

OnPickup()

When: Activates when the local player successfully picks up the object. (IE holding the object, not neccesairly clicking trigger).

Use Case: Changing the visual appearance or material of the object when held.

Requirements: Object must have a VRC_Pickup component.

OnDrop()

When: Activates when the local player drops the held object.

Use Case: Resetting the object's physical state or resetting its ownership.

Requirements: Object must have a VRC_Pickup component.

OnPickupUseDown()

When: Activates when the local player presses the "Use" button (e.g., right trigger, grip button) while holding the object.

Use Case: Firing a projectile or turning on a held flashlight.

Requirements: Object must have a VRC_Pickup component.

OnPickupUseUp()

When: Activates when the local player releases the "Use" button while holding the object.

Use Case: Stopping an action that began with OnPickupUseDown.

Requirements: Object must have a VRC_Pickup component.