Scene creation and management in Unity - Mini Project: Build & Apply

Scene Creation and Management in Unity

📖 Scenario: You are building a simple Unity game where you need to create and manage multiple scenes. Each scene represents a different part of the game, such as a main menu, gameplay area, and game over screen.

🎯 Goal: Learn how to create scenes in Unity, set up scene management, and switch between scenes using code.

📋 What You'll Learn

Create scenes with exact names

Add a scene manager script

Use UnityEngine.SceneManagement namespace

Load scenes by name using code

Ensure scenes are added to build settings

💡 Why This Matters

🌍 Real World

Games and interactive apps often have multiple scenes for menus, gameplay, and other screens. Managing scenes lets you organize and switch between these parts smoothly.

💼 Career

Knowing scene management is essential for Unity developers working on games or simulations that require multiple screens or levels.

1

Create Scenes in Unity Editor

Create three scenes in your Unity project with the exact names MainMenu, Gameplay, and GameOver. Save each scene in the Assets/Scenes folder.

Unity

// Create three scenes named MainMenu, Gameplay, and GameOver in Assets/Scenes folder
// Your code here

Hint

Use the Unity Editor's File > New Scene option to create new scenes. Save each scene with the exact names in the Assets/Scenes folder.

2

Add SceneManager Script and Import Namespace

Create a new C# script called SceneController. Inside it, add the line using UnityEngine.SceneManagement; at the top to enable scene management functions.

Unity

using UnityEngine;
// Add the SceneManagement namespace below
// Your code here

Hint

At the top of your script, add using UnityEngine.SceneManagement; to access scene loading functions.

3

Write Method to Load Gameplay Scene

Inside the SceneController class, write a public method called LoadGameplayScene that uses SceneManager.LoadScene to load the scene named Gameplay.

Unity

using UnityEngine;
using UnityEngine.SceneManagement;

public class SceneController : MonoBehaviour
{
    // Write a public method LoadGameplayScene that loads the Gameplay scene
    // Your code here
}

Hint

Define a public method that calls SceneManager.LoadScene("Gameplay") to switch scenes.

4

Add Scene to Build Settings and Finalize

Make sure all three scenes MainMenu, Gameplay, and GameOver are added to the Unity Build Settings under File > Build Settings. This allows them to be loaded at runtime.

Unity

// Add MainMenu, Gameplay, and GameOver scenes to Build Settings
// Your code here

Hint

Open Build Settings in Unity and drag each scene from Assets/Scenes into the Scenes In Build list.

Practice

1. What is the main purpose of scenes in Unity?

easy

A. To manage player input controls

B. To write scripts for game logic

C. To create 3D models for characters

D. To organize different parts of a game like levels or menus

Solution

1. Step 1: Understand what scenes represent in Unity

   Scenes are containers that hold game objects and organize the game into parts like levels or menus.

2. Step 2: Identify the correct purpose

   Among the options, only organizing game parts matches the role of scenes.

3. Final Answer:

   To organize different parts of a game like levels or menus -> Option D

4. Quick Check:

   Scenes organize game parts = A [OK]

Hint: Scenes divide your game into levels or menus [OK]

Common Mistakes:

• Confusing scenes with scripts
• Thinking scenes create 3D models
• Mixing scenes with input management

2. Which of the following is the correct way to load a scene named "Level1" using SceneManager?

easy

A. SceneManager.LoadSceneByName("Level1");

B. SceneManager.Load("Level1");

C. SceneManager.LoadScene("Level1");

D. SceneManager.LoadSceneAsync("Level1", true);

Solution

1. Step 1: Recall the correct method to load a scene synchronously

   The official method is LoadScene with the scene name as a string.

2. Step 2: Check each option

   SceneManager.LoadScene("Level1"); uses SceneManager.LoadScene("Level1"), which is correct syntax. Others are either incorrect method names or wrong parameters.

3. Final Answer:

   SceneManager.LoadScene("Level1"); -> Option C

4. Quick Check:

   LoadScene("Level1") is correct method [OK]

Hint: Use LoadScene with scene name string [OK]

Common Mistakes:

• Using incorrect method names like Load or LoadSceneByName
• Adding extra parameters incorrectly
• Confusing async and sync loading methods

3. What will happen if you run this code snippet in Unity?

using UnityEngine.SceneManagement;

void Start() {
    SceneManager.LoadScene("Menu");
    Debug.Log("Scene Loaded");
}

medium

A. The scene "Menu" loads and then "Scene Loaded" is printed

B. Nothing happens because scenes must be loaded asynchronously

C. The code causes a compile error

D. "Scene Loaded" is printed before the scene loads

Solution

1. Step 1: Understand synchronous scene loading behavior

   LoadScene loads the new scene immediately, replacing the current one, so code after it runs only if the scene is additive or async.

2. Step 2: Analyze the code flow

   Since LoadScene is synchronous and replaces the scene immediately, the scene "Menu" loads and then "Scene Loaded" is printed.

3. Final Answer:

   The scene "Menu" loads and then "Scene Loaded" is printed -> Option A

4. Quick Check:

   LoadScene is synchronous, so log runs after scene load = A [OK]

Hint: LoadScene is synchronous; code after runs after scene loads [OK]

Common Mistakes:

• Assuming LoadScene is asynchronous
• Expecting Debug.Log after scene load
• Thinking code causes errors

4. You wrote this code to load a scene but it throws an error:

SceneManager.LoadScene(Level2);

What is the most likely cause?

medium

A. The scene name should be in quotes as a string

B. SceneManager cannot load scenes

C. You must use LoadSceneAsync instead

D. Level2 is not a valid scene name

Solution

1. Step 1: Check the syntax of LoadScene argument

   LoadScene expects a string for the scene name, so it must be in quotes.

2. Step 2: Identify the error cause

   Without quotes, Level2 is treated as a variable, causing a compile error if undefined.

3. Final Answer:

   The scene name should be in quotes as a string -> Option A

4. Quick Check:

   Scene name must be string in quotes = B [OK]

Hint: Always put scene names in quotes as strings [OK]

Common Mistakes:

• Forgetting quotes around scene names
• Assuming LoadSceneAsync is required
• Thinking SceneManager can't load scenes

5. You want to load a new scene "Level3" without unloading the current scene. Which method and parameter should you use?

hard

A. SceneManager.UnloadSceneAsync("Level3");

B. SceneManager.LoadScene("Level3", LoadSceneMode.Additive);

C. SceneManager.LoadScene("Level3", LoadSceneMode.Single);

D. SceneManager.LoadSceneAsync("Level3", true);

Solution

1. Step 1: Understand scene loading modes

   LoadSceneMode.Additive loads a scene without unloading the current one, allowing multiple scenes active.

2. Step 2: Match method and parameter

   SceneManager.LoadScene("Level3", LoadSceneMode.Additive); uses LoadScene with Additive mode, which fits the requirement. LoadScene with LoadSceneMode.Single unloads the current scene. UnloadSceneAsync unloads a scene. LoadSceneAsync expects a LoadSceneMode parameter, not a boolean.

3. Final Answer:

   SceneManager.LoadScene("Level3", LoadSceneMode.Additive); -> Option B

4. Quick Check:

   Additive mode loads scene without unloading = C [OK]

Hint: Use LoadScene with Additive mode to keep current scene [OK]

Common Mistakes:

• Using Single mode which unloads current scene
• Trying to unload instead of load
• Passing incorrect parameters to LoadSceneAsync