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foreword
In Unity 3D, there are two ways to detect collisions, one is to use the collision body, and the other is to use the trigger (Trigger).
1. What is a Trigger?
Triggers are used to trigger events
For example: In a role-playing game, when the player walks to a place, a Boss event will occur, which can be implemented with a trigger. Or when building a portal, a trigger is required to complete the teleportation.
2. Operation steps
1. Check is Trigger
2. Function
Trigger information detection uses the following 3 functions:
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MonoBehaviour.OnTriggerEnter(Collider collider), fires when the trigger is entered.
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MonoBehaviour.OnTriggerExit(Collider collider), fired when the trigger is exited.
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MonoBehaviour.OnTriggerStay(Collider collider), fires when stay in the trigger
Summarize
The difference between a collider and a trigger in Unity 3D is that the collider is the carrier of the trigger, and the trigger is just a property of the collider .
Triggers can be used when you want to detect contact with objects without collision detection affecting object movement, or when you want to detect whether an object passes through a certain area in space . For example, a collision body is suitable for simulating the effect of a car being knocked into the air and a ball falling on the ground and then bouncing up, while a trigger is suitable for simulating the effect of a door automatically opening when a person stands close to the door.