PRESENCE_D2.1 Volumetric and holoconferencing technologies report I

** Deliverable not yet reviewed by the EC - Do not cite ** This deliverable presents the progress and key developments of Work Package 2 (WP2) – Multi-User Holoconferencing within the PRESENCE project. WP2 focuses on the research, design, and implementation of a real-time holoportation system that enables photorealistic, volumetric 3D human reconstruction for immersive Extended Reality (XR) communication. The document outlines the objectives, tasks, architecture, and status of WP2, detailing the advancements made in multi-camera capture, real-time 3D reconstruction, volumetric compression, and scalable holoconferencing solutions. The deliverable highlights progress in the development of a multi-camera light-field capture system, enabling real-time volumetric video acquisition with enhanced depth accuracy. Key improvements in 3D reconstruction techniques—leveraging mesh-based and point-cloud representations—have significantly optimized the system’s real-time performance. In addition, advanced volumetric video compression algorithms have been explored to maintain high visual quality while reducing bandwidth requirements for real-time transmission. To support multi-user holoportation, the work has also focused on scalability enablers, including distributed processing, edge/cloud computing, and network optimizations over 5G/6G infrastructures. This document details the technical milestones achieved in T2.1 (Capturing), T2.2 (Reconstruction), T2.3 (Compression & Streaming), and T2.4 (Scalability), along with key performance indicators (KPIs) and current challenges. The findings contribute to the broader goals of PRESENCE by bridging the gap between volumetric holoportation research and real-world multi-user XR applications