chore(brain): ASTRA 성장 자산 동기화 — 기능 인벤토리·growth(약점프로필/학습큐)·일화기억·장기기억·회의록 원문

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+---
+id: wiki-2026-0508-가상현실-vr
+title: 가상현실(VR)
+category: 10_Wiki/Topics
+status: verified
+canonical_id: self
+aliases: [VR, Virtual Reality, 가상현실]
+duplicate_of: none
+source_trust_level: A
+confidence_score: 0.9
+verification_status: applied
+tags: [vr, xr, immersive, hardware, graphics]
+raw_sources: []
+last_reinforced: 2026-05-10
+github_commit: pending
+tech_stack:
+  language: C++
+  framework: OpenXR / Unity XR / Unreal XR
+---
+
+# 가상현실(VR)
+
+## 매 한 줄
+> **"매 VR 의 head-mounted display + 6DoF tracking 의 immersive 3D world."**. 매 1968 Sutherland 의 Sword of Damocles 의 origin, 매 2026 의 Apple Vision Pro 2 / Quest 4 / Valve Deckard 의 mainstream 진입, 매 spatial computing 의 paradigm shift.
+
+## 매 핵심
+
+### 매 hardware stack
+- HMD: dual-display (매 eye 마다 4K micro-OLED 의 2026 표준).
+- Tracking: inside-out SLAM (매 cameras + IMU) 또는 outside-in lighthouse.
+- Controllers: 6DoF + finger tracking + haptics.
+- Eye tracking + foveated rendering: 매 GPU cost 의 50-70% 감소.
+
+### 매 software stack
+- OpenXR: 매 Khronos cross-vendor standard.
+- Unity XR / Unreal XR / Godot XR: engine layer.
+- WebXR: browser-based VR.
+- visionOS / Horizon OS / SteamVR: platform layer.
+
+### 매 응용
+1. Gaming (Half-Life Alyx, Beat Saber).
+2. Training simulation (surgery, aviation, military).
+3. Virtual collaboration (Horizon Workrooms, Spatial).
+4. Therapy (PTSD exposure, phobia treatment).
+
+## 💻 패턴
+
+### Pattern 1 — OpenXR session bootstrap (C++)
+```cpp
+XrInstance instance;
+XrInstanceCreateInfo ci{XR_TYPE_INSTANCE_CREATE_INFO};
+strcpy(ci.applicationInfo.applicationName, "MyVRApp");
+ci.applicationInfo.apiVersion = XR_CURRENT_API_VERSION;
+xrCreateInstance(&ci, &instance);
+
+XrSystemId sysId;
+XrSystemGetInfo sgi{XR_TYPE_SYSTEM_GET_INFO};
+sgi.formFactor = XR_FORM_FACTOR_HEAD_MOUNTED_DISPLAY;
+xrGetSystem(instance, &sgi, &sysId);
+```
+
+### Pattern 2 — Unity XR Interaction (C#)
+```csharp
+using UnityEngine.XR.Interaction.Toolkit;
+
+public class GrabHandler : MonoBehaviour {
+    void OnEnable() {
+        var grab = GetComponent<XRGrabInteractable>();
+        grab.selectEntered.AddListener(OnGrab);
+    }
+    void OnGrab(SelectEnterEventArgs args) {
+        Debug.Log($"Grabbed by {args.interactorObject}");
+    }
+}
+```
+
+### Pattern 3 — foveated rendering hint (Unreal)
+```cpp
+// VRS (Variable Rate Shading) tied to eye gaze
+FEyeTrackerGazeData gaze;
+UEyeTrackerFunctionLibrary::GetGazeData(gaze);
+FoveationRenderer->SetFoveationCenter(gaze.GazeOrigin, gaze.GazeDirection);
+FoveationRenderer->SetFoveationLevel(EFoveationLevel::High);
+```
+
+### Pattern 4 — locomotion (teleport, smooth, room-scale)
+```csharp
+// Teleport: discrete jump (low motion sickness).
+// Smooth: continuous joystick (immersion ↑, sickness ↑).
+// Room-scale: physical walking within play area.
+locomotionProvider.MoveType = comfortSetting == HIGH ? Teleport : Smooth;
+```
+
+### Pattern 5 — async reprojection (90Hz lock)
+```cpp
+// Compositor re-warps last frame using latest head pose
+// when app misses frame budget. Critical for sub-20ms motion-to-photon.
+xrEndFrame(session, &endInfo); // compositor handles reprojection
+```
+
+### Pattern 6 — WebXR session
+```javascript
+const session = await navigator.xr.requestSession('immersive-vr', {
+  requiredFeatures: ['local-floor', 'hand-tracking']
+});
+const refSpace = await session.requestReferenceSpace('local-floor');
+session.requestAnimationFrame(onXRFrame);
+```
+
+## 매 결정 기준
+| 상황 | Approach |
+|---|---|
+| 매 cross-platform deploy | OpenXR + Unity XR |
+| 매 web reach | WebXR |
+| 매 Apple ecosystem only | visionOS native (Swift + RealityKit) |
+| 매 maximum fidelity (PCVR) | Unreal + Vulkan |
+| 매 mobile standalone | Quest native (Android NDK) |
+
+**기본값**: 매 Unity XR + OpenXR 의 cross-vendor.
+
+## 🔗 Graph
+- 부모: [[Computer-Graphics]] · [[Human-Computer-Interaction]]
+- 변형: [[Mixed-Reality]] · [[Spatial-Computing]]
+- Adjacent: [[깊이_지각(Depth_perception)]]
+
+## 🤖 LLM 활용
+**언제**: 매 immersive simulation 의 design 시, 매 OpenXR API 의 boilerplate 생성, 매 locomotion 의 comfort tradeoff 분석.
+**언제 X**: 매 hardware-specific tuning (매 HMD 마다 의 IPD calibration), 매 user 의 actual motion sickness 의 real-world test.
+
+## ❌ 안티패턴
+- **Frame drops**: 매 90Hz 미달 → motion sickness 직결. 매 budget 의 11ms hard cap.
+- **Smooth locomotion default**: 매 first-time user 의 nausea 의 cause. Teleport default.
+- **Camera jerks**: 매 cinematic cuts 의 cinema convention 의 VR 적용 금지.
+- **Tiny UI**: 매 angular size <2° 의 unreadable. 매 dpi 의 web 의 mental model 금지.
+
+## 🧪 검증 / 중복
+- Verified (Khronos OpenXR spec, Apple visionOS docs, Meta Developer docs).
+- 신뢰도 A.
+
+## 🕓 Changelog
+| 날짜 | 변경 |
+|---|---|
+| 2026-05-08 | Phase 1 |
+| 2026-05-10 | Manual cleanup — VR hardware/software stack + OpenXR/Unity/Unreal patterns |