procedural generation

Why I built a deterministic, data-driven engine that compiles Natural Language into bit-identical geometry

Most generative graphics tools today rely on probabilistic AI models. They are creative, but they are messy. You can’t recreate a scene exactly, and the outputs are often unpredictable.

I wanted the opposite: **Total, bit-identical determinism.**

I’ve spent the last months building **GAP+** (Geometric Architecture Parametrics), a system where natural language inputs compile to verifiable geometry through a strictly deterministic pipeline. No AI, no dependencies, no floating-point drift.

# The Architecture: "Objects are Data, not Code"

I moved away from hardcoded Rust strings. The pipeline is now:

1. **Natural Language Input:** `geotool nl "a stone tower"`
2. **Thin Loader:** Parses modifiers and selects a template.
3. **GAP+ Template:** A parametric `.gap` file (pure data).
4. **Compiler:** Expands `include`, `repeat`, and `let` declarations.
5. **Geokern Engine:** Executes the operations to output a **Merkle Hash** that proves the scene's geometry.

# Why this is different (The "World-Class" Checklist)

* **Cross-Platform Determinism:** By using a golden-root test matrix (Linux, Windows, macOS), every scene hash is validated. If the macOS output differs by a single bit from the Linux output, the CI fails.
* **No-Recompile Workflow:** I can add a complex object (like an obelisk) by adding one `.gap` data file and one TSV registry line. The engine doesn't even know what an "obelisk" is—it just executes the parameters.
* **Zero-Warning Policy:** The codebase enforces strict `clippy` lints and standard formatting via CI. If it doesn't build perfectly, it doesn't get merged.

# The Proof

Here is a physically based render of a gold sphere generated by this pipeline:

`sphere a0 2 48` `pbr a0 0.90 0.55 0.30 1.0 0.18 0.5`

# Why this matters

This isn't just about rendering spheres. It’s about building a **Foundation for Procedural Worlds** where you can mathematically prove the state of your environment across any hardware.

I've just open-sourced the framework, and I'm looking for feedback on the architecture—specifically on how to handle compositional grammar (e.g., "a vase on a table") within a purely deterministic system.

You can check out the source, the golden-root test suite, and the engine internals here:

[https://github.com/MerlijnW70/gap](https://github.com/MerlijnW70/gap)

https://preview.redd.it/rzkf9qkqvb7h1.png?width=1280&format=png&auto=webp&s=c092900458c44c0a849d736a031dcbea7c367c0c

https://redd.it/1u5zczk
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GitHub

GitHub - MerlijnW70/gap: Deterministic procedural geometry engine — describe a 3D scene as ops, prove each obeys the laws of solid…

Deterministic procedural geometry engine — describe a 3D scene as ops, prove each obeys the laws of solid geometry, path-trace it, and get a bit-reproducible Merkle root that's identical on...

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procedural generation

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SVG Kinetic Spirograph

https://redd.it/1u65va4
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procedural generation

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Procedurally Generated creatures racing

https://redd.it/1u685dz
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procedural generation

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Tectonic plate movement simulation with voronoi convection zones and texture-pixel layer as the simulation particles with reintegration tracking.

https://redd.it/1u6d6lh
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procedural generation

OpenGL - textured grass experiments
https://youtu.be/ZXMMGey8MY8

https://redd.it/1u6jglh
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YouTube

OpenGL - textured grass experiments

NOTE: As can be seen, the grass disappears at distance. I should probably use alpha-to-coverage or mipmap alpha correction to address this issue. It is likely related to mipmap generation: lower-resolution mip levels average alpha values together, causing…

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procedural generation

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Age of Empires inspired me to make an RTS with randomly generated maps. What makes procedural maps feel memorable?

https://redd.it/1u6n33y
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procedural generation

Finally made an Infinite Lands tutorial! Starting a procedural island series
https://youtu.be/sQ_8l8Lr3WA

https://redd.it/1u6ne7j
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YouTube

How to build Procedural Terrain with Infinite Lands in Unity3D

Have you ever wanted to create your own procedural world with Infinite Lands? In this first episode of the series, we'll start by building the foundation of an island world and generating the terrain.

Whether you're making games or experimenting with procedural…

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procedural generation

Valheim-inspired fully procedural fantasy world
https://www.youtube.com/watch?v=2_Qn1pklQCU

https://redd.it/1u6y3lz
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YouTube

TotB - Prototype 4

A fully procedural 20km world. No texture assets, no pre-made meshes. Features: seeded deterministic generation; day/night cycle; weather; shadows; client/server model; 11+ biomes using a hybrid temperature/humidity/altitude model.