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Easy EffectsAnimated

Moiré rings

Two sets of concentric rings sliding over each other.

Play this challenge All challenges

The target picture for the shader challenge "Moiré rings" — 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 303 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

Offset c: float2(0.2 * sin(time * 0.5), 0.1 * cos(time * 0.7))
Wave: sin(length(p - c) * 90.0) + sin(length(p + c) * 90.0)
Brightness: 0.5 + 0.25 * wave
Dark / light: float3(0.05, 0.1, 0.2) / float3(0.7, 0.9, 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.