Hard Effects
Mirrored twisted stripes with a border
A picture built in steps: mirror left/right, then twist, then draw stripes, then color it, then finish with a border. 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 546 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: Mirror left/right
p.x = abs(p.x)- Step 2: Twist
angle = 3.5 * (1.0 - smoothstep(0.0, 0.6, length(p))); turn p by that angle- Step 3: Pattern
m = step(0.5, frac(dot(p, float2(1.0, -1.0)) * 7.0))- Step 4: Colors
lerp(float3(0.38, 0.2, 0.73), float3(0.67, 0.67, 0.18), m)- Step 5: Finish
edge = min(min(uv.x, 1.0 - uv.x), min(uv.y, 1.0 - uv.y)); col = lerp(float3(0.15, 0.82, 0.91), col, smoothstep(0.065, 0.071, 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