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hey2d
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2026-06-11 17:14
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GLSL Lesson 4: Reshaping Light and Shadow with pow()
GLSL Lesson 4: Reshaping Light and Shadow with pow() Previous Lessons Lesson 1 Your First Shader: Painting the Entire Screen One Color In the first lesson, we learned the simplest thing a fragment shader
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GLSL Lesson 3: Understanding clamp() by Breaking and Fixing Colors
In the first lesson, we learned the simplest thing a fragment shader can do: paint every pixel the same color. In the second lesson, we moved beyond a flat color and started creating gradients. Instead
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Your First Shader: Painting the Entire Screen One Color
So far we have been looking at code and breaking it apart piece by piece. That approach is useful, but there is another way to learn shaders that is often more effective: Change things and see what happens.
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The Strange Case of vUv.st: Why GLSL Keeps Swapping Coordinate Names
One of the recurring themes in learning GLSL is encountering pieces of code that seem completely unnecessary. You learn about vectors. You learn about coordinates. You start reading examples from The Book
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Lesson 9 — HSB: When Color Stops Being Fixed and Starts Becoming a Space
If gradients were the first time color became a relationship, HSB is where color starts behaving like a coordinate system. This is lesson 9 in the series, and it sits right after gradients — not as an
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Gradients, Distance, and Why Shaders Start With a Line
Most people think shaders begin with shapes, or light, or noise. But they don’t. They begin with a line, and what you choose to do with distance along that line. This code, pulled from The Book of Shaders,
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The Strange Case of vUv.st: Why GLSL Keeps Swapping Coordinate Names
One of the recurring themes in learning GLSL is encountering pieces of code that seem completely unnecessary. You learn about vectors. You learn about coordinates. You start reading examples from The Book
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When Color Learns to Breathe — A Shader That Swaps Mood Over Time
Lesson: 8 There’s something strangely alive about this kind of shader. Nothing moves, nothing is drawn in the traditional sense, yet the screen never stays the same. It quietly shifts between two colors,
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Creating Smooth Value Noise in GLSL
If you filled your screen with completely random values, the result would look like television static. Every pixel would be different from the one beside it. Nature rarely looks like that. Clouds change
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Colors in GLSL: A Beginner’s Guide to Shaders and Color Control
Color in GLSL is one of the first things that makes shader programming feel alive. You go from abstract math to something visible, expressive, and instantly creative. At its core, GLSL color is surprisingly
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Understanding UV in GLSL: The Key to Mapping Space in Shaders
UV coordinates are one of the most fundamental ideas in GLSL, yet they are often misunderstood when you first start working with shaders. At their core, UVs are simply a way to describe position inside
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Are Vector Components Constants in GLSL? Understanding What Vectors Really Are - TUTORIAL 7
One question almost every shader beginner asks is whether vector components such as .r, .g, .b, .x, .y, and .z are fixed values or special constants. The short answer is no. They are simply labels used
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Textures and Swizzling in GLSL: How Shaders Read and Rearrange Data
When most people start learning shaders, textures seem straightforward. They are images made up of pixels. But in GLSL, textures are much more than images. They are data containers, and understanding how
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Textures and Swizzling in GLSL: How Shaders Read and Rearrange Data : Lesson 6
When most people start learning shaders, textures seem straightforward. They are images made up of pixels. But in GLSL, textures are much more than images. They are data containers, and understanding how
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Drawing a Diagonal Line with GLSL
This is the fourth post in the GlSL learning series. Learning GLSL as a Beginner Understanding gl-Position: My First Real Vertex Shader Fragment Shaders Made Simple: What gl-FragColor Does What This Shader
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Drawing Curves with Math Using `pow()` - lesson 5 - GLSL
This is the fifth post in the GLSL learning series. Previous posts: Learning GLSL as a Beginner Understanding gl_Position: My First Real Vertex Shader Fragment Shaders Made Simple: What gl_FragColor Does
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Creating Procedural Galaxies and Nebulas in GLSL
Look at images captured by space telescopes. Galaxies are filled with glowing clouds of gas and dust. Some regions appear bright blue. Others glow purple, pink, or orange. The colors blend together smoothly
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Creating a Procedural Night Sky and Stars in GLSL
When you look into the night sky, the stars seem randomly scattered. Some are bright. Some are barely visible. Some appear grouped together while others sit alone. Although they look random, we can recreate
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Creating Procedural Clouds in GLSL
Look at the sky on a clear day. Clouds rarely have sharp edges. They slowly grow, merge together, drift across the horizon, and disappear. If you look closely, you'll notice large cloud formations filled
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Adding Reflections and Highlights to Procedural Water in GLSL
Think about standing beside a lake on a sunny day. The water is not one solid color. Bright highlights appear where sunlight hits the waves. Some parts look dark. Others reflect the sky. These differences
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