Computer Science
Grade 4
20 min
6. 3D Game Development: Models, Textures, and Lighting
Learn about 3D game development, including models, textures, and lighting.
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Introduction & Learning Objectives
Learning Objectives
Identify the three core components of a 3D scene: models, textures, and lighting.
Define what a 3D model is and give an example.
Explain that a texture is like a 'skin' or 'paint' for a 3D model.
Describe how lighting makes objects in a 3D game visible and can change their mood.
Use a simple algorithm to describe the steps for creating and texturing a basic object.
Predict what will happen if a light source is missing from a 3D scene.
Have you ever wondered how game creators make characters and worlds in games like Minecraft or Roblox look so cool and real? 🎮 Let's learn their secrets!
Today, we're going to be digital artists and builders! We will learn about the three main building blocks of all 3D games: Models (the shape...
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Key Concepts & Vocabulary
TermDefinitionExample
3D ModelThe shape of an object in a game, like a digital sculpture or a set of building blocks. It has height, width, and depth.A character, a car, a treasure chest, or even just a simple cube or sphere.
TextureA flat picture that wraps around a 3D model to give it color, detail, and a surface pattern. It's like the model's 'skin' or 'wrapping paper'.A picture of wood grain to put on a cube model to make it look like a wooden crate. A picture of a face to put on a sphere to make a head.
LightingThe source of light in a 3D game world, just like a lamp or the sun in real life. Without light, everything would be black!A bright 'sun' light shining down on a whole scene, or a small 'point' light like a torch that only ligh...
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Core Syntax & Patterns
The Model-Texture Pattern
1. Create a Model. 2. Apply a Texture.
You always need a shape (model) before you can give it a skin (texture). Think of it like building a snowman before you can put the carrot nose on it.
The Visibility Rule
Scene must have a Light to see Models.
Just like in a dark room, you can't see anything in a 3D scene without a light source. If your game screen is all black, you probably forgot to add a light!
The Placement Algorithm
object.position = (X, Y, Z)
To put any object (a model or a light) into your scene, you must give it a position using X, Y, and Z coordinates. This is how you arrange your game world.
4 more steps in this tutorial
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Challenging
You are designing a haunted house level. To make it as scary as possible, which combination of a model, texture, and lighting would be most effective for a mysterious object at the end of a hallway?
A.brightly colored toy box model, a clean cartoon texture, and bright, even lighting.
B.complex, detailed statue model, a shiny gold texture, and a strong spotlight on it.
C.simple, unclear shape for the model, a dark and dirty texture, and a single, flickering point light near it.
D.model of a flower, a rainbow texture, and a soft directional light like the sun.
Challenging
A developer wants to create a 'sword of fire'. They have the 3D model for the sword. What is the best combination of techniques to make it look like it's actually on fire and glowing?
A.Use a plain gray texture and a very bright white spotlight.
B.Use an animated texture that looks like moving flames and add a colored point light inside the sword model to make it cast light on its surroundings.
C.Make the sword model out of thousands of tiny, sharp polygons.
D.Change the background music to a crackling fire sound.
Challenging
You have a function `create_building(floors, window_texture)`. An algorithm needs to create a city skyline. What is the most efficient way to make a varied and interesting skyline using this function?
A.Create hundreds of different building models by hand.
B.Use one very tall building model and copy it over and over again.
C.Call the function once with `create_building(50, 'blue_windows')`.
D.Call the function many times inside a loop, using random numbers for the `floors` variable and choosing different `window_texture` variables each time.
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