UAP/D

Mission Briefing

A rural farmstead. A stretch of I-95. The herd is unaware. You are not.

Drift in low. Hold the tractor beam over a cow until it lifts; a moment too long and the energy bar empties. A civilian inside your vision cone passes through Idle → Curious → Alarmed → Reporting; each tier feeds the threat meter faster. Hit 100% threat and the mission is classified. Lift every cow on the map and the level advances — civilian count scales up, the map flips between RENDLESHAM and I-95, and the herd gets larger.

Three flyable saucers, each with its own beam-energy economy. Hold C to lay procedural crop circles for the next morning's tabloids.

Features

🛸 Three Saucers

Hornet, Starlight, Greyhound — each with distinct speed, beam range, beam time, and energy economy.

👁 Vision-Cone AI

Four-state civilian alert: Idle → Curious → Alarmed → Reporting. Each tier escalates the threat feed rate.

🚔 Mixed Witnesses

FBI agents on foot and police cruisers (faster, slower-turning) split the spotter pool.

🚁 Patrol Helicopters

Search beams sweep the airspace. On detect they lock and chase for 10s; ignore watchtowers, rain threat at 16/s.

🌾 Crop Circles

Hold C to trace concentric rings, 8-fold petals, six-arm spirals. Get spotted mid-lay and the pattern dies.

🎞 Witness Polaroids

Vintage UFO photographs slide in from the screen edge whenever a civilian first spots you.

🎵 Reactive Audio

Looped title/beam/ambient music that ducks the moment any civilian sees you. One-shot stings for spotted/escaped/fly-by.

🗺 Live Minimap

Cow targets, all enemies (color-coded by alert state), the UFO, and the camera viewport — all live in the top-left.

🌀 Endless Levels

Each clear scales civilian count and flips the map. Run mode (Shift) burns through engine-startup stamina.

UFO Archetypes

Golden Hornet

Balanced — all-purpose interceptor

Speed320
Accel1400
Beam Range140
Beam Time1.4s
Energy6.0
Recharge1.0/s

Starlight

Heavy — long beam, slower flight

Speed240
Accel1100
Beam Range190
Beam Time1.0s
Energy10.0
Recharge1.4/s

Greyhound

Light — fast, short beam

Speed440
Accel1750
Beam Range105
Beam Time1.7s
Energy4.0
Recharge2.2/s

In-game stat units are alien jargon: speed in QORG/PYL, range in VEKKS, time in KRN, energy in ZYL.

Maps

Rendlesham

Levels 1, 3, 5 …

Rural farmstead inspired by the 1980 sighting. Rendered from assets/farm.glb, top-down projected onto a 3D ground plane.

I-95 NY

Levels 2, 4, 6 …

Section of New York interstate. Long sightlines, sparse cover — cruisers turn it into a chase.

Threat Cascade

Idle → Curious → Alarmed → Reporting

Each tier feeds the threat meter faster. Threat decays at 5/s when no civilian sees you. Hit 100% and the mission is compromised.

Idle3/s

Curious7/s

Alarmed14/s

Reporting22/s

Helicopter16/s

Decay (no eyes)-5/s

Audio

File	Type	Trigger
title.mp3	music (loop)	title screen
start.mp3	one-shot	title → play transition
floating.mp3	music (loop)	play, no eyes on UFO, beam off
spotted.mp3	one-shot	civilian Idle → Curious
flyby.mp3	one-shot	UFO passes near idle civilian unseen
beam.mp3	music (loop)	tractor beam engaged
escaped.mp3	one-shot	last witness loses sight (with threat ≥ 18%)
engine.mp3	one-shot	Shift held — drives run-mode stamina
snap.mp3	one-shot	witness polaroid trigger

Tech

LanguageSingle-file C, ~3.9k lines in src/main.c

Engineraylib 5.5 (no abstraction layer)

RenderingTrue 3D scene, orthographic isometric Camera3D

ModelsglTF (.glb) loaded once, NormalizeModel pre-bakes a transform per model

Mapfarm.glb (272 MB) pre-rendered to PNG cache; iOS bundle ships only the PNG

iOSUIKit + CAEAGLLayer + CADisplayLink bridge driving StepFrame()

Build./run.sh produces a real macOS .app bundle with Cmd+Tab icon

Sourcegithub.com/binRick/uapd