Medium Effects
Bulging triangle outline with a border
A picture built in steps: bulge, then draw triangle outline, 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 449 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: Bulge
p *= 1.0 + 1.4 * dot(p, p)- Step 2: Pattern
d = max(abs(p.x) * 0.866 + p.y * 0.5, -p.y) - 0.27 * 0.5; m = 1.0 - smoothstep(0.012, 0.02, abs(d))- Step 3: Colors
lerp(float3(0.82, 0.55, 0.25), float3(0.25, 0.32, 0.82), m)- Step 4: Finish
edge = min(min(uv.x, 1.0 - uv.x), min(uv.y, 1.0 - uv.y)); col = lerp(float3(0.61, 0.96, 0.2), col, smoothstep(0.045, 0.051, 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