Skip to the content

Easy Patterns

2×2 tiled rays

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

Play this challenge All challenges

The target picture for the shader challenge "2×2 tiled rays" — 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 264 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 * 2.0 + 0.5) - 0.5 (repeat the picture 2 times across)
Step 2: Pattern: m = step(0.5, frac(atan2(p.y, p.x) / 6.2831853 * 12.0))
Step 3: Colors: lerp(float3(0.52, 0.82, 0.36), float3(0.54, 0.46, 0.85), 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.