On Trigger Enter (Collider)

Physics & collisionsDetailedOnTriggerEnter

A non-player collider enters this trigger.

Happens when another collider enters this object's area (a collider with Is Trigger on). It is a Unity physics event, called during the physics update (FixedUpdate). What entered is the collider that came in.

Both objects need a collider, at least one of them with Is Trigger on, and one of them needs a Rigidbody. In Unity's interaction table, an area with a Rigidbody reacts to any collider. An area without one reacts only to objects with a Rigidbody (a kinematic one is fine).

Unity sends the event both to the area and to the collider that came in, so it also fires on a trigger that isn't the area. Put a trigger on a ball, for example, and it fires when the ball enters the goal's area.

To notice players coming in, use On Player Trigger Enter.

Official docs: OnTriggerEnter (Unity), OnTriggerExit (Unity), Interaction between collider types (Unity)

Event values

Values this event has; action settings can use them as targets or values.

Name	Type
What entered	Collider

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WhenOn Trigger Enter (Collider)⋯

What to do

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In Udon

In UdonSharp, this is the method:

void OnTriggerEnter(Collider other)

In the same category

• On Player Collision Enter
• On Trigger Exit (Collider)
• On Player Trigger Stay
• On Player Collision Exit
• On Player Collision Stay
• On Player Particle Collision
• On Controller Collider Hit Player
• On Trigger Stay (Collider)
• On Collision Enter
• On Collision Exit
• On Collision Stay
• On Trigger Enter 2D
• On Trigger Exit 2D
• On Trigger Stay 2D
• On Collision Enter 2D
• On Collision Exit 2D
• On Collision Stay 2D
• On Controller Collider Hit
• On Particle Collision
• On Particle Trigger
• On Joint Break
• On Joint Break 2D
• On Parent Changed
• On Children Changed