Interactive L-System Visualiser

What Are L-Systems?

Lindenmayer Systems (L-systems) are formal grammars originally developed to model plant growth. Through parallel rewriting rules and recursive expansion, simple symbolic rules generate highly complex fractal structures.

This project implements:

• Parallel string rewriting

• Stack-based turtle graphics

• Recursive branching

• Fractal curve generation

✨ Features

🌱 8 Preset Systems

Includes:

• Plant A–F (branching botanical systems)

• Dragon Curve

• Koch Snowflake

Each preset is implemented using ScriptableObject configurations for modularity.

🎛 Runtime Parameter Controls

• Iteration Slider

• Angle Slider

• Step Length Slider

• Preset thumbnail buttons

• Keyboard shortcuts

All parameters update in real-time.

📷 Automatic Camera Framing

The orthographic camera dynamically resizes to fit any generated structure using combined LineRenderer bounds calculations. (Might have to click on preset twice to frame correctly)

This ensures:

• No clipping

• No manual zooming

• Clean framing at all iteration levels

🍃 Leaf Instancing System

Leaves are automatically spawned only at branch endpoints using lookahead logic. This prevents clutter and enhances realism while maintaining algorithmic correctness.

🧩 Modular Architecture

The project is structured using:

• ScriptableObject grammar definitions

• Dedicated generator class

• Separate renderer system

• UI controller layer

• Stack-based turtle state tracking

This makes the system extensible for future procedural modelling experiments.

🛠 Technical Overview

Engine: Unity
Language: C#
Rendering: LineRenderer-based turtle graphics
Camera: Orthographic auto-scaling
UI: Unity Canvas + runtime slider binding

Key systems implemented:

• StringBuilder-based parallel rewriting

• Stack-based push/pop branching

• Runtime bounds calculation

• Dynamic UI binding

• ScriptableObject-based grammar presets