ShaderBattle

Hard EffectsAnimated

Twisted scrolling rays with scanlines

A picture built in steps: twist, then scroll, then draw rays, then color it, then finish with scanlines. Every step is listed below with its exact numbers.

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The target picture for the shader challenge "Twisted scrolling rays with scanlines"
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 462 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: Twist
angle = 5.5 * (1.0 - smoothstep(0.0, 0.6, length(p))); turn p by that angle
Step 2: Scroll
p.y += time * 0.25
Step 3: Pattern
m = step(0.5, frac(atan2(p.y, p.x) / 6.2831853 * 8.0))
Step 4: Colors
lerp(float3(0.9, 0.36, 0.22), float3(0.43, 0.75, 0.93), m)
Step 5: Finish
col *= 0.8 + 0.2 * step(0.5, frac(uv.y * 80.0))

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

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