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Easy Mesh

UV checker torus

Wrap a lit checkerboard around the torus using its UV coordinates.

Play this challenge All challenges

The target picture for the shader challenge "UV checker torus" — 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 284 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

Checker: abs(fmod(floor(uv.x * 24.0) + floor(uv.y * 8.0), 2.0))
Colors: float3(0.95, 0.95, 0.9) / float3(0.15, 0.25, 0.5)
Light: normalize(float3(0.6, 0.8, 0.5)), brightness 0.2 + 0.8 * diffuse (use i_normal)

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.