Color and size over lifetime in Unity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the particle system's start color to red.

Unity

var ps = GetComponent<ParticleSystem>();
var main = ps.main;
main.startColor = [1];

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

AColor.red

BColor.yellow

CColor.green

DColor.blue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a color other than red.

Forgetting to access the main module.

The startColor property sets the initial color of particles. Using Color.red sets it to red.

2fill in blank

medium

Complete the code to enable size over lifetime module.

Unity

var ps = GetComponent<ParticleSystem>();
var sizeOverLifetime = ps.sizeOverLifetime;
sizeOverLifetime.[1] = true;

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AstartColor

Benabled

CstartSize

DplayOnAwake

Attempts:

3 left

💡 Hint

Common Mistakes

Using startSize which is not a property of the module.

Trying to set startColor here.

The enabled property activates the size over lifetime module.

3fill in blank

hard

Fix the error in setting the color gradient for color over lifetime.

Unity

var ps = GetComponent<ParticleSystem>();
var colorOverLifetime = ps.colorOverLifetime;
colorOverLifetime.enabled = true;
colorOverLifetime.color = new ParticleSystem.MinMaxGradient([1]);

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AColor.blue

BColor.green

CColor.red

Dnew Gradient()

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a Color directly instead of a Gradient.

Not enabling the module before setting color.

The color property expects a MinMaxGradient which can be created from a Gradient object, not a simple Color.

4fill in blank

hard

Fill both blanks to set size over lifetime curve and enable it.

Unity

var ps = GetComponent<ParticleSystem>();
var sizeOverLifetime = ps.sizeOverLifetime;
sizeOverLifetime.[1] = new ParticleSystem.MinMaxCurve(AnimationCurve.EaseInOut(0, 0, 1, 1));
sizeOverLifetime.[2] = true;

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Asize

Benabled

CstartSize

Dcolor

Attempts:

3 left

💡 Hint

Common Mistakes

Using startSize which is not a property here.

Forgetting to enable the module.

The size property sets the size curve, and enabled turns on the module.

5fill in blank

hard

Fill all three blanks to set a color gradient with two color keys and enable color over lifetime.

Unity

var ps = GetComponent<ParticleSystem>();
var colorOverLifetime = ps.colorOverLifetime;
var gradient = new Gradient();
gradient.colorKeys = new GradientColorKey[] {
    new GradientColorKey([1], 0.0f),
    new GradientColorKey([2], 1.0f)
};
gradient.alphaKeys = new GradientAlphaKey[] {
    new GradientAlphaKey(1.0f, 0.0f),
    new GradientAlphaKey(0.0f, 1.0f)
};
colorOverLifetime.color = new ParticleSystem.MinMaxGradient(gradient);
colorOverLifetime.[3] = true;

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AColor.yellow

BColor.red

Cenabled

DColor.blue

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the color keys' order.

Not enabling the color over lifetime module.

The gradient starts with red at time 0 and ends with yellow at time 1. The enabled property activates the color over lifetime module.