immersive2/CLAUDE.md

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

This is "immersive" - a WebXR/VR diagramming application built with BabylonJS and React. It allows users to create and interact with 3D diagrams in both standard web browsers and VR environments, with real-time collaboration via PouchDB sync.

Build and Development Commands

Development

• npm run dev - Start Vite dev server on port 3001 (DO NOT USE per user instructions)
• npm run build - Build production bundle (includes version bump)
• npm run preview - Preview production build on port 3001
• npm test - Run tests with Vitest
• npm run socket - Start WebSocket server for collaboration (port 8080)
• npm run serverBuild - Compile TypeScript server code
• npm run havok - Copy Havok physics WASM files to Vite deps

Testing

• Run all tests: npm test
• No single test command is configured; tests use Vitest

Architecture

Core Technologies

• BabylonJS 8.x: 3D engine with WebXR support and Havok physics
• React + Mantine: UI framework for 2D interface and settings
• PouchDB: Client-side database with CouchDB sync for collaboration
• Auth0: Authentication provider
• Vite: Build tool and dev server

Key Architecture Patterns

Singleton Scene Management

The application uses a singleton pattern for the BabylonJS Scene via DefaultScene (src/defaultScene.ts). Always access the scene through DefaultScene.Scene rather than creating new instances.

Observable-Based Event System

The application heavily uses BabylonJS Observables for event handling:

• DiagramManager.onDiagramEventObservable: Central hub for diagram entity changes
• DiagramManager.onUserEventObservable: User position/state updates for multiplayer
• AppConfig.onConfigChangedObservable: Application settings changes
• controllerObservable: VR controller input events

Event observers use a mask system (DiagramEventObserverMask) to distinguish:

• FROM_DB: Events coming from database sync (shouldn't trigger database writes)
• TO_DB: Events that should be persisted to database

Diagram Entity System

All 3D objects in the scene are represented by DiagramEntity types (src/diagram/types/diagramEntity.ts):

• Entities have a template reference (e.g., #image-template)
• Managed by DiagramManager which maintains a Map of DiagramObject instances
• Changes propagate through the Observable system to database and other clients

VR Controller Architecture

Controllers inherit from AbstractController with specialized implementations:

• LeftController: Menu interactions, navigation
• RightController: Object manipulation, selection
• Controllers communicate via controllerObservable with ControllerEvent messages
• Rigplatform manages the player rig and handles locomotion

Database & Sync

• PouchdbPersistenceManager (src/integration/database/pouchdbPersistenceManager.ts) handles all persistence
• Supports optional encryption via Encryption class
• Syncs to remote CouchDB via proxy (configured in vite.config.ts)
• URL pattern /db/public/:db or /db/private/:db determines database name
• Uses presence.ts for broadcasting user positions over WebSocket

Project Structure

• src/vrcore/: Engine initialization and core VR setup
• src/controllers/: VR controller implementations and input handling
• src/diagram/: 3D diagram entities, management, and scene interaction
• src/integration/: Database sync, encryption, and presence system
• src/menus/: In-VR 3D menus (not React components)
• src/objects/: Reusable 3D objects (buttons, handles, avatars)
• src/react/: React UI components for 2D interface
• src/util/: Shared utilities and configuration
• server/: WebSocket server for real-time presence

Configuration System

Two configuration systems exist (being migrated):

1. AppConfig class (src/util/appConfig.ts): Observable-based config with typed properties
2. ConfigType (bottom of appConfig.ts): Legacy localStorage-based config

Settings include snapping values, physics toggles, fly mode, and turn snap angles.

Important Development Notes

Proxy Configuration

The dev and preview servers proxy certain routes to production:

• /sync/* - Database sync endpoint
• /create-db - Database creation
• /api/images - Image uploads

Physics System

• Uses Havok physics engine (requires WASM file via npm run havok)
• Physics can be enabled/disabled via AppConfig
• customPhysics.ts provides helper functions

WebGPU Support

The engine initializer supports both WebGL and WebGPU backends via the useWebGpu parameter.

Encryption

Databases can be optionally encrypted. The Encryption class handles AES encryption with password-derived keys. Salt is stored in metadata document.

Environment Variables

• VITE_USER_ENDPOINT: User authentication endpoint
• VITE_SYNCDB_ENDPOINT: Remote database sync endpoint

Check .env.local for local configuration.