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Easy Filters

Pixelated circle

A picture built in steps: pixelate, then draw circle, then color it. Every step is listed below with its exact numbers.

Play this challenge All challenges

The target picture for the shader challenge "Pixelated circle" — 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 275 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: Pixelate: p = (floor(p * 10.0) + 0.5) / 10.0 (snap the position to a grid of 10 blocks per unit)
Step 2: Pattern: d = length(p) - 0.23; m = 1.0 - smoothstep(0.0, 0.006, d)
Step 3: Colors: lerp(float3(0.04, 0.1, 0.1), float3(0.34, 0.81, 0.91), m)

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.