Version 3 – Comprehensive Changelog
Release Scope: Major architectural overhaul, performance optimization, synchronization stability, enhanced visualization intelligence, and UX refinement.
1. Sync Engine Rearchitecture (Major)
The playback and synchronization system was completely redesigned to eliminate drift, stutter, and race conditions.
Key Enhancements:
- Migration of update logic to
videoFrameCallback for deterministic frame synchronization.
- Hybrid video-radar synchronization architecture.
- Centralized offset handling logic.
- Drift cascade lockdown mechanism.
- Manual offset persistence and improved workflow.
Impact: Playback engine is now deterministic, stable under low-end hardware, and resilient against multi-tab load conditions.
2. File Loading & Caching Overhaul (Major)
Complete modularization of file loading pipeline.
Improvements:
- Extraction of file handling into
fileLoader.js.
- Incremental JSON & video loading.
- Race condition fixes using Promise-based DB initialization.
- Non-blocking IndexedDB caching (fire-and-forget).
fromCache optimization flag.- Unit tests added for loading pipeline.
Impact: Eliminated startup crashes, resolved NaN timestamp errors, improved reload time, and increased system robustness.
3. Performance Optimization Initiative (Major)
Large-scale performance refactoring across rendering and DOM layers.
Optimizations:
- Removed unnecessary DOM updates and innerHTML usage.
- Canvas rendering optimized to avoid heap allocations.
- Reduced redundant draw calls (axes, explorer updates).
- 20% performance gain via throttling.
- FPS counter stabilization with warmup logic.
Impact: Significant memory stability improvement and smoother animation loops.
4. Advanced Visualization & UX Enhancements (Major)
Visualization layer significantly upgraded.
Enhancements:
- Interactive seeking & scrubbing in speed graph.
- Smart labeling with density-based speed coloring.
- Vehicle dimension visualization.
- Risk & state indicators integrated into track markers.
- Dynamic vertical range slider (20m–200m).
- ROI auto-scaling with dynamic plot boundaries.
- Frame-rate independent smoothing for UI interactions.
Impact: Visualization now supports intelligent data interpretation and professional-grade interaction behavior.
5. Zoom & God Mode Enhancements (Major)
- Advanced zoom control architecture.
- Inverse zoom logic implementation.
- Smooth mouse tracking for tooltip precision.
- Tooltip bounding constraints.
- Shift-key God Mode activation.
- Hover jitter reduction via relative distance square optimization.
Impact: Enhanced inspection capability for dense radar scenes with stable UX behavior.
6. In-App Documentation & Architectural Map (Major)
- Interactive codebase overview with 3D-styled navigation.
- Living documentation integration.
- Color-coded architecture explorer (Core, Sync, UI).
- PrismJS integration for syntax highlighting.
- Mini-map docking navigation system.
Impact: Application now self-documents architecture, accelerating onboarding and internal knowledge transfer.
7. User Guide & Modal System (Major)
- First-run detection with sessionStorage.
- Auto-launch user guide modal.
- Shortcut reference modal.
- Standalone shortcuts.html reference page.
- Header navigation refactor.
8. Data Explorer Enhancements (Major)
- Draggable and resizable explorer.
- Timeline synchronization.
- Additional track metadata display.
- Performance throttling.
9. Stability & Bug Fixes (Minor)
- Fixed smoothing and mapping edge cases.
- Corrected hover detection bug during scroll-zoom.
- Division-by-zero prevention safeguards.
- Fixed handleCloseUpDisplay mouseY bug.
- Debug overlay corrections.
- Speed graph fixes.
- Minor UI fixes and dark mode refinements.
- Removed Google Fonts dependency for offline support.
- Theme-aware coloring improvements.
- Various HTML & margin refinements.
10. Infrastructure & Refactoring (Minor)
- Keyboard shortcut isolation.
- UI/session logic separation from main.js.
- Deletion of obsolete files.
- Context & README updates.
- Code cleanup and dead code removal.
Summary of Version 3
Version 3 represents a major architectural milestone. The application evolved from a functional visualization prototype into a robust, modular, performance-optimized, and architecturally documented professional tool.
- Deterministic Sync Engine
- Modular File Loading Architecture
- High-Performance Rendering Pipeline
- Advanced Data Visualization Intelligence
- Integrated Living Documentation
- Professional UX & Stability Hardening
Overall Classification: Major Release – Architectural & Performance Upgrade