WebGL build in Unity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a WebGL build in Unity using the BuildPipeline.

Unity

BuildPipeline.BuildPlayer(scenes, outputPath, BuildTarget.[1], BuildOptions.None);

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

AStandaloneWindows

BiOS

CWebGL

DAndroid

Attempts:

3 left

💡 Hint

Common Mistakes

Using StandaloneWindows or other platform targets instead of WebGL.

Misspelling the BuildTarget value.

Use BuildTarget.WebGL to specify a WebGL build in Unity.

2fill in blank

medium

Complete the code to specify the output folder for the WebGL build.

Unity

string outputPath = "[1]";

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

ABuilds/WebGLBuild

BAssets/WebGL

CWebGL/Output

DBuild/WebGL

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Assets' folder which is for source files, not builds.

Using inconsistent folder names.

The output path is usually a folder like Builds/WebGLBuild where the WebGL files will be saved.

3fill in blank

hard

Fix the error in the code to build WebGL with scenes array.

Unity

string[] scenes = {"Assets/Scene1.unity", "Assets/Scene2.unity"};
BuildPipeline.BuildPlayer(scenes, outputPath, BuildTarget.[1], BuildOptions.None);

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

AWebGL

Bwebgl

CWebGl

DWEBGL

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase or incorrect casing for BuildTarget.WebGL.

Typo in the BuildTarget name.

The BuildTarget enum is case-sensitive and must be exactly 'WebGL'.

4fill in blank

hard

Fill both blanks to set build options for a development WebGL build with auto-connect profiler.

Unity

BuildOptions options = BuildOptions.[1] | BuildOptions.[2];

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

ADevelopment

BAutoConnectProfiler

CStrictMode

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using BuildOptions.None which disables special build features.

Confusing option names or missing bitwise OR operator.

Use BuildOptions.Development and BuildOptions.AutoConnectProfiler combined with bitwise OR for development builds with profiler.

5fill in blank

hard

Fill all three blanks to create a dictionary mapping scene names to their build indices for WebGL build.

Unity

var sceneIndices = new Dictionary<string, int> {
    {"[1]", [2],
    {"[3]", 1}
};

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

AMainScene

B0

CMenuScene

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up scene names and indices.

Using incorrect indices for scenes.

The dictionary maps scene names like 'MainScene' and 'MenuScene' to their build indices 0 and 1 respectively.

Practice

1. What is the main purpose of creating a WebGL build in Unity?

easy

A. To export games as console packages

B. To create mobile apps for Android and iOS

C. To run Unity games directly in web browsers without installation

D. To build desktop applications for Windows and Mac

Solution

1. Step 1: Understand WebGL build purpose

   WebGL build allows Unity games to run inside web browsers without needing users to install anything.

2. Step 2: Compare with other build targets

   Other build targets like Android or desktop require installation, unlike WebGL.

3. Final Answer:

   To run Unity games directly in web browsers without installation -> Option C

4. Quick Check:

   WebGL build = run in browser [OK]

Hint: WebGL = play games in browser, no install needed [OK]

Common Mistakes:

• Confusing WebGL with mobile or desktop builds
• Thinking WebGL requires app installation
• Assuming WebGL builds are for consoles

2. Which Unity menu option do you use to switch your project to WebGL build target?

easy

A. Window > Package Manager

B. Edit > Preferences

C. File > New Project

D. File > Build Settings

Solution

1. Step 1: Locate build target settings

   Unity uses the Build Settings window to select and switch build targets like WebGL.

2. Step 2: Confirm correct menu path

   The Build Settings window is accessed via File > Build Settings, not other menus.

3. Final Answer:

   File > Build Settings -> Option D

4. Quick Check:

   Switch build target = Build Settings [OK]

Hint: Build Settings is where you pick WebGL target [OK]

Common Mistakes:

• Choosing Edit > Preferences which is for editor settings
• Selecting Window > Package Manager which manages packages
• Confusing File > New Project with build settings

3. After building a Unity WebGL project, which file do you open in a browser to start the game?

medium

A. game.exe

B. index.html

C. main.unity

D. build.json

Solution

1. Step 1: Identify WebGL build output files

   Unity WebGL build creates an index.html file to launch the game in browsers.

2. Step 2: Understand file roles

   Other files like .exe or .unity are not used for WebGL browser launch.

3. Final Answer:

   index.html -> Option B

4. Quick Check:

   Open index.html to run WebGL game [OK]

Hint: Open index.html to play WebGL game in browser [OK]

Common Mistakes:

• Trying to open .exe files which are for desktop
• Confusing build.json as launch file
• Attempting to open .unity files directly

4. You built your Unity project for WebGL but the game does not load in the browser. What is a common cause?

medium

A. Not running a local or remote web server to serve the files

B. Using the wrong Unity version for WebGL

C. Forgetting to save the scene before building

D. Not installing the WebGL module in Unity Hub

Solution

1. Step 1: Understand WebGL file loading requirements

   WebGL builds require serving files via a web server; opening index.html directly from file system often fails due to browser security.

2. Step 2: Check other options

   While Unity version and modules matter, the most common cause is missing a web server.

3. Final Answer:

   Not running a local or remote web server to serve the files -> Option A

4. Quick Check:

   WebGL needs web server to load files [OK]

Hint: Always use a web server to test WebGL builds [OK]

Common Mistakes:

• Opening index.html directly without server
• Ignoring Unity Hub WebGL module installation
• Assuming saving scene fixes loading issues

5. You want to optimize your Unity WebGL build to reduce loading time. Which approach helps achieve this?

hard

A. Enable Compression Format (e.g., gzip or Brotli) in Player Settings

B. Increase texture resolution for better quality

C. Add more scenes to the build to preload content

D. Disable WebGL memory size limit in Player Settings

Solution

1. Step 1: Identify optimization methods for WebGL loading

   Compression formats like gzip or Brotli reduce file sizes, speeding up downloads and load times.

2. Step 2: Evaluate other options

   Increasing texture resolution or adding more scenes increases load size; disabling memory limits can cause crashes.

3. Final Answer:

   Enable Compression Format (e.g., gzip or Brotli) in Player Settings -> Option A

4. Quick Check:

   Compression reduces WebGL load time [OK]

Hint: Use compression to shrink WebGL build files [OK]

Common Mistakes:

• Increasing texture size which slows loading
• Adding many scenes unnecessarily
• Disabling memory limits causing instability