ALSF-2 sequenced flashing lights (SFL) | (Menyoo, YMAP, NativeUI)

# ALSF-2 Ultimate - Airport Lighting System "The Rabbit"

A realistic approach lighting system for Los Santos International Airport (LSIA) and helipads in GTA V. This mod adds dynamic sequenced flasher (rabbit) lights to runways and strobe lighting for helipads.

## Features

* **Realistic Runway Approach Lighting**: ALSF-2 style sequenced flasher lights (rabbit lights) for all LSIA runways.
* **Optimized Sequencing**: **Fixed speed** of **2 complete runs per second** (regardless of runway length).
* **Multiple Runway Support**: Pre-configured lighting for runways 21, 12L, 12R, 33L, and 33R.
* **Helipad Strobe Lights**: Flashing perimeter lights for helipads (Strawberry Hospital included).
* **Individual Control**: Enable/disable each lighting system independently via in-game menu.
* **Customizable Settings**: Adjustable light intensity and visual parameters.
* **Extra Threshold Lights**: Additional lights at runway thresholds and REIL positions.

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## Requirements

* **Script Hook V** (latest version)
* **Script Hook V .NET** (latest version)
* **NativeUI** (included or download separately)

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## Installation

1. Make sure you have Script Hook V and Script Hook V .NET installed.
2. Copy `ALSF2_Ultimate.dll` to your `scripts` folder (create the folder if it doesn't exist).
3. Copy `NativeUI.dll` to your `scripts` folder (if not already installed).
4. Launch GTA V.

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## Usage

1. Press **F6** (default key) to open the menu.
2. Check the box next to any runway or helipad to activate its lighting system.
3. Adjust **Brightness** in the menu if needed.
4. The lights will automatically run in a continuous sequenced pattern.

### Menu Options

* **RWY 21 / 12L / 12R / 33L / 33R**: Toggle runway approach lighting on/off.
* **Strawberry Heli**: Toggle helipad strobe lighting on/off.
* **Brightness**: Adjust light intensity (e.g., 50, 100, 200, 350, 500).
* **Menu Key**: F6 (default).

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## How It Works

### Runway Lighting (ALSF-2 System)
* Lights spawn in a line from approach point to runway threshold.
* The sequenced flasher animation runs **continuously without any pause** when enabled.
* **Fixed Sequence Speed**: The system dynamically calculates the flash interval based on the number of lights to ensure a constant rate of **2 full sequences per second**.
* 30-foot spacing between lights (realistic FAA standard).
* Additional threshold and REIL lights at runway ends.

### Helipad Lighting
* Single strobe light at helipad center.
* 5 flashes per cycle at 100ms intervals.
* 1-second pause between cycles.
* Reduced intensity (25%) for realistic strobe effect.

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## Performance

* Lights are optimized with an LOD distance of 5000 units.
* Props are made invisible to reduce visual clutter.
* Only light effects are drawn (no physical objects visible).
* Minimal performance impact.

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## Known Limitations

* Lighting systems are purely visual (no collision).
* Works best at night or in low visibility.
* Some runways may need manual adjustment for custom airport mods.

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## Troubleshooting

* **Menu won't open**: Make sure `NativeUI.dll` is in your scripts folder.
* **No lights visible**: Check that the system is enabled in the menu and try increasing **Brightness**.
* **Script crashes**: Ensure you have the latest Script Hook V .NET version.
* **Lights in wrong position**: This mod is designed for the default LSIA layout.

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## Credits

* **Inspired by**: Real-world FAA ALSF-2 approach lighting systems.

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## License

This mod may be used for personal purposes at no cost. However, re-uploading or redistributing this mod is strictly prohibited. Please link to the original download page instead of mirroring the files.

## Support

For bug reports and suggestions, please visit my Discord Server: [https://discord.com/invite/P9MBtDNYD7](https://discord.com/invite/P9MBtDNYD7)

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Enjoy!