Particle collision in Unity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to detect when a particle collides with another object.

Unity

void OnParticleCollision(GameObject [1]) {
    Debug.Log("Particle collided with " + [1].name);
}

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

Aother

Bcollider

Ccollision

Dobj

Attempts:

3 left

💡 Hint

Common Mistakes

Using a parameter name that doesn't match the method signature.

Confusing the parameter type with collision data.

The method OnParticleCollision receives a GameObject parameter representing the other object involved in the collision. Naming it 'other' is common and clear.

2fill in blank

medium

Complete the code to get the ParticleSystem component attached to the GameObject.

Unity

ParticleSystem ps = gameObject.[1]<ParticleSystem>();

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

AFindObjectOfType

BGetComponent

CAddComponent

DGetComponents

Attempts:

3 left

💡 Hint

Common Mistakes

Using AddComponent instead of GetComponent.

Using FindObjectOfType which searches the whole scene.

GetComponent() returns the component of type T attached to the GameObject.

3fill in blank

hard

Fix the error in the code to correctly stop the particle system on collision.

Unity

void OnParticleCollision(GameObject other) {
    ParticleSystem ps = other.GetComponent<ParticleSystem>();
    if (ps != null) {
        ps.[1]();
    }
}

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

APause

BPlay

CDestroy

DStop

Attempts:

3 left

💡 Hint

Common Mistakes

Using Play() which starts the system instead of stopping it.

Using Destroy() which removes the component instead of stopping it.

To stop a ParticleSystem, use the Stop() method.

4fill in blank

hard

Fill both blanks to check if the collided object has a specific tag and then stop its particle system.

Unity

void OnParticleCollision(GameObject [1]) {
    if ([1].CompareTag("Enemy")) {
        ParticleSystem ps = [1].GetComponent<ParticleSystem>();
        if (ps != null) {
            ps.Stop();
        }
    }
}

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

Aother

Bobj

Ctarget

Dcollider

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names causing errors.

Using a variable name not declared as parameter.

The parameter name must be consistent. 'other' is used to represent the collided GameObject.

5fill in blank

hard

Fill all three blanks to create a dictionary that maps particle system names to their collision counts, only including those with counts greater than zero.

Unity

Dictionary<string, int> collisionCounts = new Dictionary<string, int>();
foreach (var ps in particleSystems) {
    int count = ps.GetCollisionEvents(gameObject, collisionEvents);
    if (count [1] 0) {
        collisionCounts[ps.[2]] = count;
    }
}
var filtered = collisionCounts.Where(kv => kv.Value [3] 0).ToDictionary(kv => kv.Key, kv => kv.Value);

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

A>

Bname

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect property names like 'length' instead of 'name'.

Using wrong comparison operators like '<' instead of '>'.

We check if count > 0, use ps.name to get the particle system's name, and filter dictionary entries where value > 0.