This Alien Does Not Exist

A procedural alien generator with Infinite^{4,294,967,296} unique aliens.

Live: https://thisaliendoesnotexist.app/
Devlog: https://stardance.hackclub.com/projects/29187

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About

This Alien Does Not Exist generates alien creatures entirely from a numerical seed.

There are no pre-made models, stored creatures, or AI-generated images. Every alien is generated from scratch from its seed.

The same seed always generates the same alien, giving every creature a permanent, shareable URL that anyone can revisit.

The project explores how complex creatures can emerge entirely from deterministic procedural generation.

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Features

• Deterministic generation
• 4,294,967,296 (2³² seeds) unique creatures and one more
• Permanent, shareable URL for every creature
• Procedurally generated anatomy and biological traits
• Browser-based renderer
• No AI or stored assets
• There is an Easter Egg in there... something related to the Mulberry32 limitations^{If begun with 0 it only goes upto (2³² - 1)}

Exactly 4,294,967,296 unique deterministic aliens can be generated.

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Example

Seed (My current fav)
0806318074

↓

https://thisaliendoesnotexist.app/0806318074

Opening that URL will always generate the exact same alien.

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How it Works

Seed
   ↓
Genome
   ↓
Morphology
   ↓
Procedural Rendering
   ↓
Alien

Each generated genome determines characteristics such as:

• Body plan
• Body mass
• Body proportions
• Limb count
• Limb length
• Head size
• Neck length
• Tail type
• Eye count
• Horn count
• Skin colour
• Behavioural traits

These values are combined to construct and render the final creature entirely from procedural geometry.

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Technologies

• JavaScript
• HTML5 Canvas
• Mulberry32 PRNG
• Signed Distance Fields (SDF)
• FABRIK Inverse Kinematics
• Procedural Value Noise

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Running Locally

Clone the repository:

git clone https://github.com/aamosm/This-Alien-Does-Not-Exist.git
cd This-Alien-Does-Not-Exist

Start a local server:

python -m http.server

Open:

http://localhost:8000

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Roadmap

• Better depth and occlusion
• More body plans
• Improved head and eye generation
• More anatomical variation
• Planet and ecosystem generation