Particle lifetime and speed in Unity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the particle system's start lifetime to 5 seconds.

Unity

var particleSystem = GetComponent<ParticleSystem>();
var main = particleSystem.main;
main.startLifetime = [1]f;

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

A5

B10

C0

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using an integer without 'f' suffix causes a type error.

Setting lifetime to 0 means particles die immediately.

The startLifetime property controls how long each particle lives. Setting it to 5f means particles last 5 seconds.

2fill in blank

medium

Complete the code to set the particle system's start speed to 3 units per second.

Unity

var particleSystem = GetComponent<ParticleSystem>();
var main = particleSystem.main;
main.startSpeed = [1]f;

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

A0

B10

C-3

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using negative speed values.

Forgetting the 'f' suffix for floats.

The startSpeed property sets how fast particles move when emitted. 3f means 3 units per second.

3fill in blank

hard

Fix the error in setting the particle lifetime to 0 (which disables particles). Use 1 second instead.

Unity

var particleSystem = GetComponent<ParticleSystem>();
var main = particleSystem.main;
main.startLifetime = [1]f;

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

A-1

B1

C0

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Setting lifetime to zero disables particles.

Using negative values causes errors.

Setting startLifetime to 0 disables particles immediately. Using 1f sets a visible lifetime.

4fill in blank

hard

Fill both blanks to set the particle system's start lifetime to 2 seconds and start speed to 4 units per second.

Unity

var particleSystem = GetComponent<ParticleSystem>();
var main = particleSystem.main;
main.startLifetime = [1]f;
main.startSpeed = [2]f;

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

A2

B3

C4

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up lifetime and speed values.

Using zero or negative values.

Setting startLifetime to 2f and startSpeed to 4f configures the particle system as requested.

5fill in blank

hard

Fill all three blanks to create a particle system, set start lifetime to 3 seconds, start speed to 6 units per second, and enable looping.

Unity

var particleSystem = gameObject.AddComponent<ParticleSystem>();
var main = particleSystem.main;
main.startLifetime = [1]f;
main.startSpeed = [2]f;
main.loop = [3];

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

Atrue

B6

C3

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing true/false for loop property.

Swapping lifetime and speed values.

This code creates a particle system, sets lifetime to 3 seconds, speed to 6 units per second, and enables looping by setting loop to true.