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Medium EffectsAnimated

Checker tunnel

Fly down an endless checkered tunnel.

Play this challenge All challenges

The target picture for the shader challenge "Checker tunnel" — 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 353 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

Polar: r = length(p), a = atan2(p.y, p.x)
Depth u: 0.3 / r + time
Around v: a / 3.14159 * 4.0
Checker: abs(fmod(floor(u * 3.0) + floor(v), 2.0))
Colors: float3(0.1,0.1,0.3) / float3(0.9,0.5,0.2)
Darken the center: col *= smoothstep(0.0, 0.25, r)

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.