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You will have a choice when adding collider components “ Whether it is a trigger ”——Is Trigger The option to , Check this box , When the rigid body moves, it will pass through the collision body .

Before understanding triggers , You can learn what is a trigger event .

Triggering event

Triggering event —— When a GameObject bound to a collider enters the trigger range of another GameObject
When the trigger event occurs , There will be no direct collision , It is —— As long as you enter the trigger area, you will perform some operations

Trigger and collider

Collision detection

Unity Middle collision body Coliider It is a kind of component , There are many kinds .

Collision detection 3 Methods

When the colliders of two game objects first touch （ Note that this is not a game object contact , It's the collider of the game object Collider Component contact ）, Call once OnCollisionEnter() function
As long as the two colliders are in contact , Will always call OnCollisionStay() function
When two colliding bodies separate from each other , Call once OnCollisionExit() function

Conditions for collision detection

Two game objects A and B Achieve collision detection

The moving object must be a rigid body ,A and B At least one is a rigid body
A and B They must all be collision bodies （Is Trigger All must be closed , It cannot be a trigger ）
A and B You can detect collisions with each other （ There is a collision detection script）

The relationship between trigger and collision body

stay Unity in , There are two ways to detect collisions ： Use triggers to detect & Use collision detection
The collider can be regarded as the carrier of the trigger , The trigger is just an attribute of the collision body

Trigger detection

Of a collision body Is Trigger Options

After checking , The collision body becomes a trigger , At this time, the boundary of the collision body becomes the trigger area .

When the trigger event occurs , Rigid bodies do not collide directly with colliding objects , But directly penetrate the collision body .

Trigger detection 3 Methods

If the impactor component is checked Is Trigger The option to , When the trigger event occurs OnTriggerEnter(Collier) function
When still within the trigger range , Would call OnTriggerStay(Collier) function
When leaving the trigger range , Trigger will be called OnTriggerExit(Collier) function

Trigger the condition of detection implementation

When A and B Two objects implement trigger detection

The moving object must be a rigid body
A and B As long as one is a trigger , Trigger detection can be realized
A and B Trigger detection can be realized with each other （ There is a trigger for detection script）

Trigger application scenario

When we want to detect contact between objects , We don't want collision detection to affect the movement of objects , Trigger can be used at this time , For example, the following situations are suitable for using triggers