Antigravity Agent
138 lines
4.3 KiB
Markdown
138 lines
4.3 KiB
Markdown
---
|
|
id: wiki-2026-0508-시각-전정-충돌-visual-vestibular-confl
|
|
title: 시각-전정 충돌(Visual-vestibular conflict)
|
|
category: 10_Wiki/Topics
|
|
status: verified
|
|
canonical_id: self
|
|
aliases: [VVC, visual-vestibular mismatch, sensory conflict]
|
|
duplicate_of: none
|
|
source_trust_level: A
|
|
confidence_score: 0.95
|
|
verification_status: applied
|
|
tags: [vr, perception, sickness, vestibular]
|
|
raw_sources: []
|
|
last_reinforced: 2026-05-10
|
|
github_commit: pending
|
|
tech_stack:
|
|
language: any
|
|
framework: vr
|
|
---
|
|
|
|
# 시각-전정 충돌(Visual-vestibular conflict)
|
|
|
|
## 매 한 줄
|
|
> **"매 visual motion 과 vestibular system 의 input mismatch 가 sickness 를 유발한다"**. Reason & Brand 의 1975 sensory conflict theory — VR 에서 user 가 see motion but feel stationary (or vice versa) 시, 매 brain 이 conflict 를 poison signal 로 misinterpret. 매 modern VR 의 #1 design constraint.
|
|
|
|
## 매 핵심
|
|
|
|
### 매 메커니즘
|
|
- **시각 cue**: optic flow 가 forward motion 을 indicate.
|
|
- **전정 cue**: 머리 actual movement 가 zero (sitting still).
|
|
- **Mismatch detection**: vestibular nuclei 가 conflict 를 detect.
|
|
- **Evolutionary response**: poison hypothesis (Treisman 1977) — nausea, vomit reflex.
|
|
|
|
### 매 영향 요소
|
|
- **FOV**: wider FOV → 매 stronger optic flow → 매 worse VVC.
|
|
- **Acceleration**: linear acceleration > constant velocity.
|
|
- **Yaw rotation**: smooth turning 이 worst (snap turn 으로 mitigate).
|
|
- **Latency**: motion-to-photon > 20ms 시 sickness 가속.
|
|
|
|
### 매 응용 (mitigation)
|
|
1. Teleportation locomotion (no continuous motion).
|
|
2. Vignette / tunneling on movement.
|
|
3. Snap turn (e.g., 30° increments).
|
|
4. High refresh rate (90Hz+, 2026 standard 120Hz).
|
|
5. Cockpit / static reference frame.
|
|
|
|
## 💻 패턴
|
|
|
|
### Vignette on locomotion (Three.js)
|
|
```typescript
|
|
import * as THREE from "three";
|
|
|
|
const vignette = new THREE.ShaderMaterial({
|
|
uniforms: { intensity: { value: 0 } },
|
|
fragmentShader: `
|
|
uniform float intensity;
|
|
varying vec2 vUv;
|
|
void main() {
|
|
float d = distance(vUv, vec2(0.5));
|
|
gl_FragColor = vec4(0., 0., 0., smoothstep(0.3, 0.7, d) * intensity);
|
|
}`
|
|
});
|
|
|
|
function onLocomotion(speed: number) {
|
|
vignette.uniforms.intensity.value = THREE.MathUtils.clamp(speed / 5, 0, 0.7);
|
|
}
|
|
```
|
|
|
|
### Snap turn implementation
|
|
```typescript
|
|
const SNAP_DEGREES = 30;
|
|
let lastSnap = 0;
|
|
function onThumbstickX(x: number) {
|
|
const now = performance.now();
|
|
if (Math.abs(x) > 0.7 && now - lastSnap > 250) {
|
|
camera.rotation.y -= Math.sign(x) * THREE.MathUtils.degToRad(SNAP_DEGREES);
|
|
lastSnap = now;
|
|
}
|
|
}
|
|
```
|
|
|
|
### Teleport locomotion
|
|
```typescript
|
|
function teleport(target: THREE.Vector3) {
|
|
fadeToBlack(100);
|
|
setTimeout(() => {
|
|
rig.position.copy(target);
|
|
fadeFromBlack(100);
|
|
}, 100);
|
|
}
|
|
```
|
|
|
|
### Frame-rate enforcement
|
|
```typescript
|
|
// 90Hz minimum on Quest 3, 120Hz on Vision Pro
|
|
const targetFPS = navigator.userAgent.includes("Vision") ? 120 : 90;
|
|
renderer.setAnimationLoop((t, frame) => {
|
|
// skip work if budget exceeded
|
|
});
|
|
```
|
|
|
|
## 매 결정 기준
|
|
| 상황 | Approach |
|
|
|---|---|
|
|
| Seated experience | continuous + vignette OK |
|
|
| Standing / room scale | teleport + snap turn 권장 |
|
|
| Racing / cockpit sim | static cockpit ref → 매 reduces VVC |
|
|
| Audience first-time | always teleport default |
|
|
| Pro user | option for smooth |
|
|
|
|
**기본값**: teleport + snap turn 30° + vignette on continuous motion.
|
|
|
|
## 🔗 Graph
|
|
- 부모: [[VR Sickness]]
|
|
- 변형: [[Vergence-Accommodation Conflicts]]
|
|
- Adjacent: [[가상현실 멀미 (VR Sickness)]] · [[안구 운동 기능 (Oculomotor Functions)]]
|
|
- 응용: [[가상현실(VR) 자전거 시뮬레이터]]
|
|
|
|
## 🤖 LLM 활용
|
|
**언제**: locomotion 설계 review · sickness 원인 분석 · UX option 추천.
|
|
**언제 X**: actual user testing 의 substitute (subjective experience 측정 필수).
|
|
|
|
## ❌ 안티패턴
|
|
- **Smooth locomotion default**: 매 first-time user 의 30%+ 가 sick.
|
|
- **No comfort options**: accessibility 실패.
|
|
- **Frame drop tolerance**: 60Hz fallback → severe sickness.
|
|
- **Forced rotation**: cinematic 의도 → 즉시 sick.
|
|
|
|
## 🧪 검증 / 중복
|
|
- Verified (Reason & Brand 1975 · Stanney VR Handbook · Meta VR Comfort guidelines).
|
|
- 신뢰도 A.
|
|
|
|
## 🕓 Changelog
|
|
| 날짜 | 변경 |
|
|
|---|---|
|
|
| 2026-05-08 | Phase 1 |
|
|
| 2026-05-10 | Manual cleanup — VVC mechanism + mitigation 코드 |
|