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Unity Engine

Create and configure a trigger collider

Create a trigger collider and configure its associated GameObject to correctly call events on trigger interactions.
Read time 1 minuteLast updated 18 days ago
A trigger collider does not collide with other colliders; instead, other colliders pass through it.
To create a trigger collider:
  1. Create a GameObject:
    1. To make an invisible trigger collider, create an empty GameObject. In most cases, trigger colliders are invisible.
    2. To make a visible trigger collider, create a GameObject that has a mesh. You should only create a visible trigger collider if it is okay for other GameObjects to visibly pass through it at run time.
  2. Add a Collider to the GameObject.
  3. Make the collider a trigger:
    1. To do this in the Editor, navigate to the collider’s Inspector and enable the Is Trigger property.
    2. To do this via script, set the collider’s 
      IsTrigger
      to 
      true
      .

Configure trigger collisions

Make sure there is at least one dynamic collider in the collision. At least one GameObject involved in a trigger collision must have a physics body (a Rigidbody or an ArticulationBody). In most cases, trigger colliders are stationary and static (that is, they have no physics body), and the colliders that pass through them are moving and dynamic (that is, they have a physics body).
Experiment with the size and shape of your trigger collider. For gameplay and simulation, triggers might need some adjustment to make them feel intuitive for the player. For example, you could experiment with making a trigger collider slightly larger than its associated visible GameObject, so that it has a wider radius.