---
title: "3DARCH-EP-4 — Experience Live Co-Presence"
description: "Review the governed outcome and child Features for 3DARCH-EP-4."
---

# Experience Live Co-Presence

| Epic | Delivery status | Status source | Owner | Approved for Solution |
|---|---|---|---|---|
| `3DARCH-EP-4` | `IN_BACKLOG` | `DERIVED` | 3D Architecture Wizzard team | No |

## Goal

Synchronize scene-aware position, orientation, avatar, identity, and movement or activity state for people sharing a floor.

## Benefit

Participants experience a consistent sense of being together as colleagues join, move, change floors, or leave.

## Problem or opportunity

A shared virtual workplace is not credible unless participants can recognize who is present and see their movement and activity coherently.

## Constraints

- Only materially implemented legacy behavior is included; planned-only capabilities remain outside the approved catalogue.

## Features

- [3DARCH-FT-18 — See who shares the current floor](./3darch-ep-4/features/3darch-ft-18.md)
- [3DARCH-FT-19 — Recognize coworkers by workplace identity](./3darch-ep-4/features/3darch-ft-19.md)
- [3DARCH-FT-20 — Follow coworker movement and activity in real time](./3darch-ep-4/features/3darch-ft-20.md)

These Features are approved for documentation only. Each remains outside Architecture solution work until a separate human **Approved for Solution** decision is recorded.

## Original source

- [Legacy-analysis request — RootAtSkic](https://discord.com/channels/1518726359512387766/1543925247361814568/1544617403160465409)
- [Catalogue documentation approval — Linas](https://discord.com/channels/1518726359512387766/1543925247361814568/1544641572975673394)

### Legacy implementation evidence

The catalogue was mined from legacy revision `c0ced47ecaf4426f47e5c2e4868677f7144b951a`.

- [`apps/singularity/src/socket-server/event-handlers.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/singularity/src/socket-server/event-handlers.ts)
- [`apps/singularity/src/socket-server/scene-manager.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/singularity/src/socket-server/scene-manager.ts)
- [`apps/singularity/src/socket-server/broadcast-service.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/singularity/src/socket-server/broadcast-service.ts)
- [`apps/nebula/src/socket-client.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/nebula/src/socket-client.ts)
- [`apps/nebula/src/components/Player.tsx`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/nebula/src/components/Player.tsx)
- [`packages/utils/types/src/player.types.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/packages/utils/types/src/player.types.ts)