竹知了3D vs Ear Sonar

一根竹签，一条细绳，绳头拴着一只竹筒做的知了。 手指划着圈把它甩起来，它就绕着签头转，转一圈，叫一声。 摇得越快，叫得越急。 这是很多人童年记忆里的那只竹知了。 如今我们把它一比一搬进了手机：竹纹、红漆、烙画的翅脉、 两颗黑木珠眼睛，都照着老玩具的样子重新做了一遍。 ■ 真实的物理，不是动画 知了是被真正「甩」起来的。转速越高，离心力把绳子甩得越平， 它扫出的圈子越大——这是圆锥摆，和你小时候手里那只一模一样。 ■ 声音是算出来的，不是录音 竹膜上那根松香线的「黏—滑」摩擦，被一比一建模成了声音： 摩擦脉冲、竹腔共鸣、随公转扫动的共振峰， 凑成那声拖长的蝉鸣。转得越急，叫得越密。 每一次响都是实时算出来的，所以每一次都不重样。 ■ 手指划圈，也可以摇手机 划圈甩，或者直接晃动手机，两种玩法都行。 ■ 想让它喊什么，它就喊什么 「哇」可以改成任意四个字。你写什么，它就一路喊着什么转。 ■ 四种背景，一个清屏模式 纯黑、柳影、叶隙、光斑随你挑。 点左上角进入清屏，满屏只剩一只知了在转。 明月别枝惊鹊，清风半夜鸣蝉。 夏夜的声音，收在手机里了。

Ear Sonar is an accessibility app that helps people who are blind or have low vision sense nearby space. It uses the iPhone’s rear LiDAR to scan what’s ahead, then turns that depth into spatial audio—or haptics—so you can “hear” the environment. What you can hear • Distance: nearer sounds arrive sooner, denser, or higher in pitch; farther sounds are sparser and lower • Direction: binaural spatial audio places objects to your left or right • Shape cues: flat walls, slopes, and gaps create distinct sonic rhythms Four sensing modes • Echolocation: row-by-row pings outline space like sonar returns • Pitch sonar: a rising scan line encodes distance as pitch in real time • Continuous sonar: a fixed center line for a live depth profile while you walk • Haptic sonar: vibration timing encodes distance—no headphones required Semantic markers Optionally detect people, vehicles, dogs, chairs, tables, doors, and more, then announce them in stereo from their real-world direction. All processing stays on device; nothing is uploaded. Tips • Stereo headphones are recommended (Apple headphones with head tracking and spatial audio work best); haptic mode can be used without headphones • Full VoiceOver support, including gestures and the rotor • Requires an iPhone with LiDAR (iPhone 12 Pro and later Pro models) • This is an assistive tool—not a replacement for a cane, guide dog, or your own judgment when traveling Open the app and start hearing space. Camera preview is on by default so sighted helpers can see what’s being scanned. To keep the experience focused, the app intentionally avoids UI that isn’t essential to core sensing. Questions or suggestions: ninerwong@outlook.com