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Easy Patterns

4×4 tiled ring

A picture built in steps: tile, then draw ring, then color it. Every step is listed below with its exact numbers.

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The target picture for the shader challenge "4×4 tiled ring" — Recreate this picture. You pass at a 99% match, then try to write it in fewer characters than the par.

How this challenge works

You write a fragment shader that draws the picture above, live in your browser. A match bar shows how close you are, and the score combines accuracy, code size (the par is 326 characters in Unity (Built-in)) and GPU speed. Work in HLSL, GLSL, WGSL, Metal or Godot and export the result when you are done.

The numbers you need

Space: p = (uv - 0.5) * float2(aspect, 1.0)
Step 1: Tile: p = frac(p * 4.0 + 0.5) - 0.5 (repeat the picture 4 times across)
Step 2: Pattern: d = abs(length(p) - 0.23) - 0.23 * 0.18; m = 1.0 - smoothstep(0.0, 0.006, d)
Step 3: Colors: lerp(float3(0.94, 0.91, 0.95), lerp(float3(0.74, 0.2, 0.88), float3(0.1, 0.7, 0.23), uv.y), m)

Solve it in your language

Unity (Built-in), Unity (URP), Unreal, Shadertoy / WebGL, OpenGL (LWJGL, raylib), three.js, GameMaker, LÖVE (Lua), Godot, Apple (iOS, macOS), WebGPU / Bevy.