Implements a robust caching and loading system for Three.js GLTF models with Draco compression. Provides real-time download progress tracking using the Fetch API and ReadableStream, prioritizes initial model loading, and preloads additional models in the background to avoid bandwidth contention. Includes error handling and a mechanism to clone GLTF scenes for safe reuse in multiple Three.js instances. The core logic is framework-agnostic and could be adapted for other resource types with minimal changes.

A React hook that subscribes to the loading state of a model from the modelLoader system. Tracks status (idle, downloading, parsing, done, error) and progress (0-1) with automatic updates when state changes. Handles auto-starting loads based on configuration and cleanly manages subscriptions to prevent memory leaks. Decouples loading logic from UI components, making it reusable for any resource loading scenario in React applications.

A self-contained, accessible loading overlay component that displays a spinner, progress bar, and status text during resource loading. Uses SVG for an animated circular progress indicator (resembling a cell) and CSS for the progress bar. Accepts props for progress percentage, status text, model name, and optional error message. Designed for reuse in any loading scenario with minimal dependencies—only requires the progress and status values to function. The component is responsive and includes ARIA attributes for screen reader accessibility.