Hard Effects
8-way kaleidoscope of grid, tilted with a fade to dark at the bottom
A picture built in steps: tilt, then kaleidoscope, 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 532 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: Tilt
turn p by 1.0 radians: c = cos(1.0), s = sin(1.0), p = float2(c * p.x + s * p.y, -s * p.x + c * p.y)- Step 2: Kaleidoscope
a = atan2(p.y, p.x); a = abs(fmod(a + 6.2831853, 0.785) - 0.393); p = length(p) * float2(cos(a), sin(a)) (8 mirrored wedges)- Step 3: Pattern
e = abs(frac(p * 6.0) - 0.5); m = step(0.43, max(e.x, e.y)) (lines on the cell borders)- Step 4: Colors
lerp(float3(0.2, 0.17, 0.09), lerp(float3(0.86, 0.79, 0.27), float3(0.4, 0.89, 0.82), uv.y), m)- Step 5: Finish
col *= 0.65 + 0.35 * 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