ShaderBattle

Medium 3DAnimated

Spinning torus

Raymarch a donut that spins around the vertical axis.

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The target picture for the shader challenge "Spinning torus"
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 963 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

Camera / light / loop
same as the Raymarching lesson, but camera at float3(0.0, 0.0, -3.5)
Spin
a = time * 0.7; p.xz = mul(float2x2(cos(a), -sin(a), sin(a), cos(a)), p.xz)
Tilt
b = 0.6: the same matrix on p.yz
Torus
q = float2(length(p.xz) - 0.8, p.y); return length(q) - 0.3
Color
float3(0.3, 0.8, 0.9) * (0.15 + 0.85 * diffuse)

Helper functions provided

The toolbox has: calcNormal(). Add them above your frag function with one click.

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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