🎮 Unity Game Engine Basics

🎯 What is Unity?

• A game development engine
• Used to create 2D and 3D games
• Supports mobile, VR, AR, and desktop games
• Uses the C# programming language

🖥️ What is a Game Engine?

A game engine is software that provides tools to build games.

• Graphics rendering
• Physics system
• Audio tools
• Animation system
• Scene management

🧱 Core Unity Concepts

Scene

A level or screen in your game (Main Menu, Level 1, Game Over).

GameObject

Everything in Unity is a GameObject (Player, Enemy, Camera, Light).

Component

Components give GameObjects behavior (Rigidbody, Collider, Script).

Transform

• Position
• Rotation
• Scale

🧠 Unity Interface Overview

• Hierarchy: Shows all objects in scene
• Scene View: Design workspace
• Game View: What the player sees
• Project Window: Stores assets
• Inspector: Edit properties and components

⚙️ Prefabs

A reusable GameObject template. Update once, apply everywhere.

🧮 Physics Basics

• Rigidbody: Enables gravity and physics
• Collider: Detects collisions

💻 Scripting in Unity (C#)

Scripts control movement, input, and game logic.

void Update()
{
    transform.Translate(Vector3.forward * Time.deltaTime);
}

• Start() → Runs once
• Update() → Runs every frame
• FixedUpdate() → Physics updates

🎮 Player Input

Input.GetKey(KeyCode.W);

Detects keyboard, mouse, controller, or touch input.

🎨 2D vs 3D

• 2D: Sprites, X-Y movement
• 3D: Models, X-Y-Z movement

💡 Basic Game Development Workflow

1. Create Scene
2. Add GameObjects
3. Add Components
4. Write Scripts
5. Test
6. Debug
7. Build/Export

🧪 Debugging

• Console window
• Debug.Log("message");
• Pause and step through frames

🚀 Build Platforms

• Windows
• Mac
• WebGL
• Android
• iOS

🧩 Important Vocabulary

Term	Meaning
Scene	A level or screen
GameObject	Any object in game
Component	Adds behavior
Script	C# code
Prefab	Reusable object
Rigidbody	Physics component
Collider	Detects collisions

🎯 Why Learn Unity?

• Builds programming skills
• Encourages creativity
• Used in gaming, film, architecture, VR, and simulations

🧠 Quick Check Questions

1. What is a GameObject?
2. What does Transform control?
3. What method runs every frame?
4. What component enables physics?
5. What is a Prefab?