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Use collisions to trigger other events
OnCollision events

Interaction between collider types

The following collisionA collision occurs when the physics engine detects that the colliders of two GameObjects make contact or overlap, when at least one has a Rigidbody component and is in motion. More info
See in Glossary matrix table describe which event messages Unity generates based on the configuration of each colliderAn invisible shape that is used to handle physical collisions for an object. A collider doesn’t need to be exactly the same shape as the object’s mesh - a rough approximation is often more efficient and indistinguishable in gameplay. More info
See in Glossary in a collision pair:

Collider types Static collider Dynamic collider Kinematic collider Static trigger collider Dynamic trigger collider Kinematic trigger collider
Static collider No collision event message sent Collision detectionAn automatic process performed by Unity which determines whether a moving GameObject with a Rigidbody and collider component has come into contact with any other colliders. More info
See in Glossary occurs and messages sent on collision		 No collision event message sent No collision event message sent Trigger messages sent on collision Trigger messages sent on collision
Dynamic collider Collision detection occurs and messages sent on collision Collision detection occurs and messages sent on collision Collision detection occurs and messages sent on collision Trigger messages sent on collision Trigger messages sent on collision Trigger messages sent on collision
Kinematic collider No collision event message sent Collision detection occurs and messages sent on collision No collision event message sent Trigger messages sent on collision Trigger messages sent on collision Trigger messages sent on collision
Static trigger collider No collision event message sent Trigger messages sent on collision Trigger messages sent on collision No collision event message sent Trigger messages sent on collision Trigger messages sent on collision
Dynamic trigger collider Trigger messages sent on collision Trigger messages sent on collision Trigger messages sent on collision Trigger messages sent on collision Trigger messages sent on collision Trigger messages sent on collision
Kinematic trigger collider Trigger messages sent on collision Trigger messages sent on collision Trigger messages sent on collision Trigger messages sent on collision Trigger messages sent on collision Trigger messages sent on collision

Collision generates collision detection messages

When a pair of colliders make contact, they generate collision detection messages if the following are both true:

  • There is at least one dynamic collider.
  • The other collider is a static collider, a kinematic collider, or another dynamic collider.

Trigger colliders don’t generate collision detection messages.

Unity only applies physics forces to collider GameObjectsThe fundamental object in Unity scenes, which can represent characters, props, scenery, cameras, waypoints, and more. A GameObject’s functionality is defined by the Components attached to it. More info
See in Glossary that have a physics body (a Rigidbody or ArticulationBody). When a physics body collider collides with a static collider, only the physics body collider behavior changes as a result of the collision (for example, it might bounce or slow down as a result of the collision).

Collision generates trigger messages

Trigger messages occur in the following circumstances:

  • A dynamic or kinematic trigger collider collides with any collider type.
  • A static trigger collider collides with any dynamic or Kinematic collider.

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Use collisions to trigger other events
OnCollision events
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