Easy PatternsAnimated

Scrolling checkerboard with a border

A picture built in steps: scroll, then draw checkerboard, then color it, then finish with a border. Every step is listed below with its exact numbers.

Play this challenge All challenges

The target picture for the shader challenge "Scrolling checkerboard with a border" — 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 394 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: Scroll: p.y += time * 0.25
Step 2: Pattern: m = abs(fmod(floor(p.x * 10.0) + floor(p.y * 10.0), 2.0))
Step 3: Colors: lerp(float3(0.39, 0.93, 0.38), float3(0.94, 0.43, 0.79), m)
Step 4: Finish: edge = min(min(uv.x, 1.0 - uv.x), min(uv.y, 1.0 - uv.y)); col = lerp(float3(0.91, 0.79, 0.42), col, smoothstep(0.035, 0.041, edge))

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.

Start coding

How this challenge works

The numbers you need

Solve it in your language

More patterns challenges