Open Simplex Noise in C (with LuaJIT FFI bindings)

This repository is a fork and enhancement of Kurt Spencer's original OpenSimplex Noise algorithm, ported from Java to C.

⚠️ Note: This is not Ken Perlin’s Simplex noise algorithm. It is a separate and patent-free noise function with similar benefits.

🚀 Features

• Support for 2D, 3D, and 4D noise
• LuaJIT bindings via FFI (see opensimplex-lua.lua)
• Ideal for procedural generation (e.g. terrain, textures, maps, etc.)

📦 Files

• open-simplex-noise.c/h – Core C implementation
• opensimplex-lua.lua – LuaJIT FFI wrapper
• usageExample.lua – LuaJIT usage example
• Makefile – Compile with make
• .gitignore, LICENSE, README.md

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🔧 Building of lib(.dll, .o, .os)

make

🔌 Example Usage in LuaJIT (via FFI)

local simplex = require("opensimplex-lua")

local noise = simplex.new(123456) -- Start with a seed

print("=== Noise 2D ===")
for i = 0, 4 do
    local val = noise:noise2(i * 0.1, i * 0.2)
    print(string.format("noise2(%.2f, %.2f) = %.4f", i * 0.1, i * 0.2, val))
end

See full usage in usageExample.lua.

🎮 Why this project?

This library was enhanced and adapted for procedural terrain and map generation for games, currently being developed using a pipeline of C, Lua (LuaJIT), and Python (with bpy for Blender integration).

You can check out the full project here:
🔗 Procedural Generation of Maps → github.com/Thomaskynol/ProceduralGenerationMaps

OpenSimplex provides smooth and visually pleasing noise ideal for:

• Terrain generation
• Biome maps
• Texture synthesis
• Noise-based animations

📜 License

MIT License – see LICENSE

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🙌 Credits

• Kurt Spencer – Original creator of the OpenSimplex noise algorithm (Java implementation)
• smcameron – C port of Kurt Spencer’s implementation
• Thomas – LuaJIT FFI bindings and Lua integration