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Medium EffectsAnimated

Hypnotic spiral

A two-armed spiral spinning outward.

Play this challenge All challenges

The target picture for the shader challenge "Hypnotic spiral" — 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 268 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

s: sin(r * 40.0 + a * 2.0 - time * 4.0) (r = length, a = atan2(y, x))
Edge: smoothstep(-0.1, 0.1, s)
Colors: float3(0.1,0.05,0.25) / float3(1.0,0.75,0.2)

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.