Shattter

The ultimate glass-breaking gag app for iPhone Duo. Native UIKit + SwiftUI, no dependencies.

• Unfolded: bend the hinge and stress webs crack out along the crease, with crackling sounds and haptics, until the pane gives way.
• Folded or unfolded: every tap leaves its own crack web. Tap the same spot again and it spreads. After the chosen number of hits (1, 2, 3, 5, 8, or never), cracks race across the whole pane and it bursts.
• 20 crack patterns for taps and hinge bends, each distinct even from a single hit: Spider Web, Bullseye, Starburst, Buckshot, Lightning, Tempered, Shear, Corner Drop, Pebble Chip, Hairline, Spiral, Honeycomb, Daggers, Edge Split, Ripple, Fault Line, Snowflake, Crater, Chaos and Double Tap. Or Surprise Me for a different pattern every hit.
• Crackgate Mode 😬: recreates the October 2026 iPhone Duo inner-display reports (9to5Mac, MacRumors, Engadget on iFixit's teardown). While the phone unfolds, something catches in the hinge, then there's one loud crack. A thin crack runs along the crease from the same spot in its lower half, just below the hinge cable, where iFixit found the center support bar's stress point. A band of stuck bright pixels then runs from the break across one half of the screen; it's usually white, with iFixit's green-line variant sometimes. Finally a "#Crackgate · $999" gotcha card appears.
• 10 sound packs: Phone Screen, Window Pane, Wine Glass, Bottle Smash, Car Window (tempered), Mirror, Crystal, Ice Crack, Cartoon and 8-Bit. Tap one in the options to hear it.
• Six shatter animations: Explode, Crumble, Black Hole (shards spiral into the impact, then pop), Blast (shockwave), Slow-Mo, and Hang & Drop. Or let it surprise you.
• Prank screens: the glass can sit over a convincing fake Lock Screen (live time, "Did you drop your phone again??" notification), Home Screen, Messages thread, switched-off screen, or photo. When a fake screen breaks, it shows a dead, bleeding LCD, then optionally "Gotcha! 😜".
• Repairs: Fade In with a fresh pane, or Rewind, where the shards fly back and reassemble.
• Hidden options: hold anywhere with two fingers. Shake the phone to smash it outright. The title only shows briefly when the plain Glass screen opens; fake screens never show it.

How it works

File	Responsibility
Shattter/Glass/FractureGeometry.swift	Seeded, grid-accelerated Voronoi fractures plus procedural cracks for all 20 patterns, hinge stress webs and multi-impact patterns. Neighbouring shards share identical jagged edges.
Shattter/Glass/CrackPattern.swift	The 20 crack patterns and their web parameters.
Shattter/Glass/GlassView+Crackgate.swift	Crackgate Mode: crease crack, stuck pixel block, gotcha card.
Shattter/Glass/GlassView.swift	Multi-hit crack webs (pre-built pool for instant cracks), hinge stress, intro, effects.
Shattter/Glass/GlassView+Shatter.swift	Shatter styles, shard physics, Fade In and Rewind repairs.
Shattter/Screens/ScreenArt.swift	Fake Lock Screen, Home Screen, Messages, Screen Off and photo.
Shattter/Options/	Settings model and the hidden SwiftUI options sheet.
Shattter/Glass/GlassViewController.swift	UIHingeInteraction (iOS 27.1) hinge angle/status updates and shake handling.
Shattter/Glass/PaneArtwork.swift	Renders the pane and pre-cuts shard sprites off the main thread while cracks spread.
Shattter/Audio/GlassSynth.swift	Procedural glass synthesis: noise-excited resonator shards, micro-fracture crackle, band-limited crash, ringing pane modes and a diffuse room. No audio files.
Shattter/Audio/SoundPack.swift	The 10 sound packs and their recipes.
Shattter/Audio/GlassSound.swift	Pack loading and previews, pooled players, Core Haptics.

Build, test, ship

project.yml is the source of truth; run xcodegen generate after adding files.

xcodebuild -project Shattter.xcodeproj -scheme Shattter \
  -destination 'platform=iOS Simulator,name=iPhone Duo' -derivedDataPath build build
xcodebuild -project Shattter.xcodeproj -scheme Shattter \
  -destination 'platform=iOS Simulator,name=iPhone 18 Pro' -derivedDataPath build-tests test
./scripts/testflight.sh   # archive + upload to App Store Connect (build numbers auto-increment)

Tuning tools:

swiftc scripts/FracturePreview/main.swift Shattter/Glass/FractureGeometry.swift Shattter/Glass/CrackPattern.swift -o build/fracture-preview && build/fracture-preview /tmp/patterns.png
swiftc scripts/AppIcon/main.swift Shattter/Glass/FractureGeometry.swift Shattter/Glass/CrackPattern.swift -o build/appicon && build/appicon Shattter/Resources/Assets.xcassets/AppIcon.appiconset/AppIcon.png

Debug builds accept -ShowOptions to open the options sheet at launch. On the simulator, agent-device fold open|half-open|closed --keyframes '[{"atMs":0,"angle":180},{"atMs":800,"angle":120}]' drives the hinge.