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koriweb d8a80f6272 chore(wiki): dangling 링크 canonical 정규화 (768파일/1200건)

이름만 다른(표기 변형) [[위키링크]]를 대상 문서의 canonical 제목으로 치환해
끊겼던 1,200개 링크를 연결. 제목/파일명 정규화 일치만 적용하고 별칭 매칭은
과병합 위험으로 제외(애매성 가드). 원본은 _link_reconcile_backup/ 에 백업.
도구: Datacollect/scripts/link_reconcile_apply.mjs

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-08 12:24:15 +09:00

4.9 KiB

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title

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

Gaming (Half-Life Alyx, Beat Saber).
Training simulation (surgery, aviation, military).
Virtual collaboration (Horizon Workrooms, Spatial).
Therapy (PTSD exposure, phobia treatment).

💻 패턴

Pattern 1 — OpenXR session bootstrap (C++)

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#)

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)

// 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)

// 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)

// 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

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

4.9 KiB Raw Blame History