Hard Effects
Polar 5×5 tiled grid with a fade to dark at the bottom
A picture built in steps: polar coordinates, then tile, then draw grid, then color it, then finish with a fade to dark at the bottom. Every step is listed below with its exact numbers.
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 396 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: Polar coordinates
p = float2(atan2(p.y, p.x) / 3.1415927, length(p) * 2.0) (x = angle from -1 to 1, y = distance)- Step 2: Tile
p = frac(p * 5.0 + 0.5) - 0.5 (repeat the picture 5 times across)- Step 3: Pattern
e = abs(frac(p * 7.0) - 0.5); m = step(0.43, max(e.x, e.y)) (lines on the cell borders)- Step 4: Colors
lerp(float3(0.08, 0.22, 0.19), lerp(float3(0.23, 0.92, 0.93), float3(0.95, 0.39, 0.62), uv.y), m)- Step 5: Finish
col *= 0.6 + 0.4 * uv.y
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