Easy Patterns

Mirrored rays with a dark vignette

A picture built in steps: mirror left/right, then draw rays, then color it, then finish with a dark vignette. Every step is listed below with its exact numbers.

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The target picture for the shader challenge "Mirrored rays with a dark vignette" — 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 383 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: Mirror left/right: p.x = abs(p.x)
Step 2: Pattern: m = step(0.5, frac(atan2(p.y, p.x) / 6.2831853 * 12.0))
Step 3: Colors: lerp(float3(0.9, 0.96, 0.95), lerp(float3(0.12, 0.71, 0.86), float3(0.89, 0.2, 0.39), uv.y), m)
Step 4: Finish: col *= 1.0 - 0.75 * smoothstep(0.4, 0.9, length(s)), s = (uv - 0.5) * float2(aspect, 1.0)

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.

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How this challenge works

The numbers you need

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