Easy Patterns
3×3 tiled grid with a border
A picture built in steps: tile, then draw grid, then color it, then finish with a border. Every step is listed below with its exact numbers.
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 450 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 * 3.0 + 0.5) - 0.5 (repeat the picture 3 times across)- Step 2: Pattern
e = abs(frac(p * 9.0) - 0.5); m = step(0.45, max(e.x, e.y)) (lines on the cell borders)- Step 3: Colors
lerp(float3(0.17, 0.19, 0.1), lerp(float3(0.53, 0.83, 0.41), float3(0.68, 0.47, 0.85), uv.y), m)- Step 4: Finish
edge = min(min(uv.x, 1.0 - uv.x), min(uv.y, 1.0 - uv.y)); col = lerp(float3(0.51, 0.94, 0.55), col, smoothstep(0.03, 0.036, edge))
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.
Start coding