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Easy Patterns

Tilted rays

A picture built in steps: tilt, 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 "Tilted 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 335 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: Tilt: turn p by 0.5 radians: c = cos(0.5), s = sin(0.5), p = float2(c * p.x + s * p.y, -s * p.x + c * p.y)
Step 2: Pattern: m = step(0.5, frac(atan2(p.y, p.x) / 6.2831853 * 24.0))
Step 3: Colors: lerp(float3(0.48, 0.84, 0.29), float3(0.8, 0.33, 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.