Trigger vs collision detection in Unity - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to detect when an object enters a trigger collider.

Unity

void OnTriggerEnter(Collider [1]) {
    Debug.Log("Object entered trigger");
}

Drag options to blanks, or click blank then click option'

Acollision

Bcol

Cother

Dhit

Attempts:

3 left

💡 Hint

Common Mistakes

Using collision instead of other in OnTriggerEnter.

Forgetting to include the parameter.

The method OnTriggerEnter receives a Collider parameter commonly named other to represent the object entering the trigger.

2fill in blank

medium

Complete the code to detect when two colliders collide (not triggers).

Unity

void OnCollisionEnter(Collision [1]) {
    Debug.Log("Collision detected");
}

Drag options to blanks, or click blank then click option'

Ahit

Bother

Ccol

Dcollision

Attempts:

3 left

💡 Hint

Common Mistakes

Using other instead of collision in OnCollisionEnter.

Confusing trigger and collision methods.

The OnCollisionEnter method receives a Collision parameter often named collision to represent the collision details.

3fill in blank

hard

Fix the error in the method name to detect trigger exit events.

Unity

void On[1]Exit(Collider other) {
    Debug.Log("Object exited trigger");
}

Drag options to blanks, or click blank then click option'

ATrigger

BCollision

CCollider

DTriggerEnter

Attempts:

3 left

💡 Hint

Common Mistakes

Using OnCollisionExit for trigger events.

Misspelling the method name.

The correct method name for detecting when an object exits a trigger is OnTriggerExit.

4fill in blank

hard

Fill both blanks to correctly check if the collider is a trigger and log a message.

Unity

void OnCollisionEnter(Collision [1]) {
    if ([2].collider.isTrigger) {
        Debug.Log("Triggered by a trigger collider");
    }
}

Drag options to blanks, or click blank then click option'

Acollision

Bother

Attempts:

3 left

💡 Hint

Common Mistakes

Using other as parameter name but collision inside the method.

Checking isTrigger on the wrong object.

In OnCollisionEnter, the parameter is usually named collision. To check if the collider is a trigger, use collision.collider.isTrigger.

5fill in blank

hard

Fill all three blanks to create a method that detects trigger stay events and logs the name of the other object.

Unity

void On[1]Stay(Collider [2]) {
    Debug.Log($"Object [3] is staying in trigger");
}

Drag options to blanks, or click blank then click option'

ATrigger

Bother

C{other.name}

DCollision

Attempts:

3 left

💡 Hint

Common Mistakes

Using OnCollisionStay instead of OnTriggerStay.

Forgetting to use string interpolation for the object's name.

The method name is OnTriggerStay. The parameter is other. To log the object's name, use {other.name} inside the string.