docs: add WebXR integration product requirements document

Author: ralyodio

WEBXR-PRD.md

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+# WebXR Integration PRD
+## Product Requirements Document for convert2doc.com/webxr
+
+### Executive Summary
+
+This PRD outlines the integration of a comprehensive WebXR (Virtual Reality) experience into the convert2doc.com platform, making it accessible at `https://convert2doc.com/webxr`. The WebXR application is a fully-featured VR experience built with Three.js and the WebXR API, offering immersive 3D environments, spatial audio, multiplayer capabilities, and cross-platform VR support.
+
+### Product Overview
+
+**Product Name**: Convert2Doc WebXR Experience  
+**URL**: `https://convert2doc.com/webxr`  
+**Target Audience**: VR enthusiasts, developers, and users with WebXR-compatible devices  
+**Platform**: Web-based (WebXR API), with packaging options for Quest Store, SteamVR, and PWA
+
+### Current State Analysis
+
+The WebXR application already exists in the `./webxr` directory with:
+- ✅ Complete WebXR implementation using Three.js
+- ✅ Hono.js integration ready (`webxr/hono-integration.js`)
+- ✅ Already integrated in main application (`index.js` line 16, 25)
+- ✅ SPA routing configured to handle `/webxr` paths
+- ✅ Static file serving configured
+- ✅ Theme integration with main application CSS
+
+### Technical Architecture
+
+#### Core Technologies
+- **WebXR API**: Native browser VR support
+- **Three.js**: 3D rendering engine
+- **Hono.js**: Server-side routing and static file serving
+- **Web Components**: Modular UI system
+- **Spatial Audio**: 3D positioned audio system
+- **WebSocket**: Multiplayer networking (optional)
+
+#### File Structure
+```
+webxr/
+├── index.html              # Main entry point
+├── hono-integration.js     # Server integration (already implemented)
+├── integration.md          # Integration documentation
+├── src/
+│   ├── core/               # Core WebXR functionality
+│   │   ├── main.js         # Application entry point
+│   │   ├── xr-session.js   # WebXR session management
+│   │   ├── environment.js  # 3D environment setup
+│   │   └── controllers.js  # VR controller handling
+│   ├── ui/                 # User interface components
+│   │   ├── vr-router.js    # VR scene routing
+│   │   ├── ui-panel.js     # VR UI panels
+│   │   └── styles.css      # VR-specific styling
+│   ├── scenes/             # VR scenes/environments
+│   │   ├── home-scene.js   # Home/landing scene
+│   │   ├── gallery-scene.js # Gallery/showcase scene
+│   │   └── settings-scene.js # Settings/configuration
+│   ├── components/         # Reusable VR components
+│   ├── audio/              # Spatial audio system
+│   ├── network/            # Multiplayer functionality
+│   └── utils/              # Utility functions
+└── packaging/              # Distribution options
+    ├── pwa/                # Progressive Web App
+    ├── quest/              # Meta Quest Store
+    └── steamvr/            # SteamVR/PCVR
+```
+
+### Features & Capabilities
+
+#### Core VR Features
+1. **Immersive 3D Environment**
+   - Responsive VR scene using Three.js
+   - Custom 3D models and skybox support
+   - Dynamic lighting and shadows
+   - Performance optimization for various devices
+
+2. **VR Interaction System**
+   - Teleportation locomotion
+   - Object interaction with VR controllers
+   - Hand tracking support (where available)
+   - Gesture recognition
+
+3. **Spatial Audio System**
+   - 3D positioned audio
+   - Environmental audio effects
+   - Voice chat support (multiplayer)
+   - Audio occlusion and reverb
+
+4. **Cross-Platform Support**
+   - Meta Quest (1, 2, 3, Pro)
+   - HTC Vive series
+   - Valve Index
+   - Windows Mixed Reality
+   - Desktop fallback mode
+
+#### UI/UX Features
+1. **VR-Native UI System**
+   - Floating UI panels in 3D space
+   - Controller-attached menus
+   - Gaze-based interaction
+   - Voice commands (optional)
+
+2. **Scene Navigation**
+   - VR router for scene transitions
+   - Smooth scene loading
+   - Bookmark/favorite locations
+   - History navigation
+
+3. **Accessibility Features**
+   - Comfort settings (snap turning, teleport)
+   - Motion sickness reduction options
+   - Text scaling and contrast
+   - Audio descriptions
+
+#### Advanced Features
+1. **Multiplayer Support**
+   - Real-time multi-user experiences
+   - Avatar system
+   - Voice chat
+   - Shared object manipulation
+
+2. **Content Management**
+   - Dynamic environment loading
+   - Asset streaming
+   - User-generated content support
+   - Cloud save/sync
+
+3. **Performance Monitoring**
+   - Built-in FPS counter
+   - Performance analytics
+   - Adaptive quality settings
+   - Device capability detection
+
+### Integration Requirements
+
+#### Server-Side Integration
+- ✅ **Already Implemented**: Hono.js integration at `/webxr` route
+- ✅ **Already Implemented**: Static file serving for WebXR assets
+- ✅ **Already Implemented**: SPA routing configuration
+- ✅ **Already Implemented**: Theme CSS integration
+
+#### Client-Side Integration
+1. **Navigation Integration**
+   - Add WebXR entry point to main navigation
+   - VR capability detection
+   - Device compatibility warnings
+   - Entry/exit transitions
+
+2. **Theme Consistency**
+   - Use main application's CSS variables
+   - Consistent color scheme in VR
+   - Typography matching
+   - Brand consistency
+
+3. **User Account Integration**
+   - Single sign-on with main application
+   - User preferences sync
+   - Usage analytics integration
+   - Subscription/access control
+
+### User Experience Flow
+
+#### Entry Flow
+1. **Discovery**: User navigates to `/webxr` or clicks VR button
+2. **Compatibility Check**: Automatic WebXR capability detection
+3. **Device Setup**: VR headset connection and calibration
+4. **Environment Loading**: Initial scene and asset loading
+5. **Tutorial**: First-time user onboarding
+6. **Main Experience**: Full VR environment access
+
+#### Core Experience
+1. **Home Scene**: Welcome environment with navigation options
+2. **Gallery Scene**: Showcase of VR capabilities and content
+3. **Settings Scene**: VR preferences and device configuration
+4. **Custom Scenes**: Extensible scene system for future content
+
+#### Exit Flow
+1. **Safe Exit**: Proper VR session termination
+2. **Return to Web**: Seamless transition back to main site
+3. **Session Summary**: Usage statistics and achievements
+4. **Feedback Collection**: User experience feedback
+
+### Technical Requirements
+
+#### Browser Compatibility
+- **Primary**: Chrome 79+, Firefox 76+, Edge 79+
+- **VR Browsers**: Oculus Browser 7.0+, Firefox Reality
+- **Fallback**: Desktop mode for non-VR browsers
+- **Mobile**: Limited support, focus on VR headsets
+
+#### Performance Requirements
+- **Target FPS**: 90 FPS (VR standard)
+- **Minimum FPS**: 72 FPS (acceptable VR performance)
+- **Loading Time**: < 5 seconds for initial scene
+- **Memory Usage**: < 2GB RAM for optimal performance
+
+#### Security & Privacy
+- **HTTPS Required**: WebXR API requires secure context
+- **Permissions**: Camera, microphone, device orientation
+- **Data Privacy**: Minimal data collection, user consent
+- **Content Security**: XSS protection, safe asset loading
+
+### Distribution Strategy
+
+#### Primary Distribution
+- **Web-based**: Direct access via `convert2doc.com/webxr`
+- **Progressive Web App**: Installable web app
+- **Social Sharing**: Easy sharing of VR experiences
+
+#### Platform-Specific Distribution
+1. **Meta Quest Store**
+   - Native Android app packaging
+   - Quest-specific optimizations
+   - Store listing and marketing
+
+2. **SteamVR/PCVR**
+   - Electron app packaging
+   - Steam store distribution
+   - SteamVR integration
+
+3. **Enterprise Distribution**
+   - White-label solutions
+   - Custom branding options
+   - API integration capabilities
+
+### Success Metrics
+
+#### Engagement Metrics
+- **Daily Active Users**: Target 100+ daily VR sessions
+- **Session Duration**: Average 10+ minutes per session
+- **Return Rate**: 30%+ weekly return rate
+- **Feature Usage**: Track most popular VR features
+
+#### Technical Metrics
+- **Performance**: Maintain 90 FPS for 95% of sessions
+- **Compatibility**: Support 90%+ of WebXR devices
+- **Loading Speed**: < 5 second average load time
+- **Error Rate**: < 1% session failure rate
+
+#### Business Metrics
+- **User Acquisition**: Track referral sources to VR experience
+- **Conversion**: VR users to main platform conversion
+- **Retention**: Long-term user engagement
+- **Feedback**: User satisfaction scores
+
+### Development Phases
+
+#### Phase 1: Foundation (Current State)
+- ✅ Core WebXR implementation
+- ✅ Server integration
+- ✅ Basic VR scenes
+- ✅ Theme integration
+
+#### Phase 2: Enhancement (Next Steps)
+- [ ] Navigation integration in main app
+- [ ] User account integration
+- [ ] Performance optimization
+- [ ] Cross-browser testing
+
+#### Phase 3: Advanced Features
+- [ ] Multiplayer implementation
+- [ ] Advanced UI components
+- [ ] Content management system
+- [ ] Analytics integration
+
+#### Phase 4: Distribution
+- [ ] PWA packaging
+- [ ] Quest Store submission
+- [ ] SteamVR packaging
+- [ ] Marketing and promotion
+
+### Risk Assessment
+
+#### Technical Risks
+- **Browser Compatibility**: WebXR adoption varies
+- **Performance**: VR requires high performance
+- **Device Fragmentation**: Multiple VR platforms
+- **Mitigation**: Extensive testing, fallback modes
+
+#### Business Risks
+- **Market Adoption**: VR still niche market
+- **Development Cost**: Complex VR development
+- **Maintenance**: Ongoing platform updates
+- **Mitigation**: Phased rollout, community feedback
+
+#### User Experience Risks
+- **Motion Sickness**: VR comfort issues
+- **Learning Curve**: VR interaction complexity
+- **Accessibility**: Limited accessibility options
+- **Mitigation**: Comfort settings, tutorials, accessibility features
+
+### Resource Requirements
+
+#### Development Team
+- **VR Developer**: WebXR and Three.js expertise
+- **UI/UX Designer**: VR interface design
+- **QA Engineer**: VR testing across devices
+- **DevOps**: Deployment and monitoring
+
+#### Infrastructure
+- **CDN**: Fast asset delivery for VR content
+- **Monitoring**: Performance and error tracking
+- **Analytics**: User behavior tracking
+- **Backup**: Asset and configuration backup
+
+#### Timeline
+- **Phase 2**: 4-6 weeks (Enhancement)
+- **Phase 3**: 8-12 weeks (Advanced Features)
+- **Phase 4**: 6-8 weeks (Distribution)
+- **Total**: 18-26 weeks for full implementation
+
+### Conclusion
+
+The WebXR integration represents a significant technological advancement for convert2doc.com, positioning the platform at the forefront of immersive web experiences. With the core implementation already complete and integrated, the focus shifts to enhancement, optimization, and distribution across multiple VR platforms.
+
+The modular architecture and comprehensive feature set provide a solid foundation for future expansion, while the multiple distribution options ensure broad market reach. Success will depend on execution quality, performance optimization, and user experience refinement.
+
+### Next Steps
+
+1. **Immediate**: Test current integration and identify enhancement priorities
+2. **Short-term**: Implement navigation integration and user account sync
+3. **Medium-term**: Optimize performance and expand feature set
+4. **Long-term**: Pursue platform-specific distribution and advanced features
+
+This PRD serves as the roadmap for transforming the existing WebXR implementation into a market-ready, production-quality VR experience that enhances the convert2doc.com platform's value proposition.