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Reconstructing 3D models from large, dense point clouds is critical to enableVirtual Reality (VR) as a platform for entertainment, education, and heritagepreservation. Existing 3D reconstruction systems inevitably make trade-offsbetween three conflicting goals: the efficiency of reconstruction (e.g., timeand memory requirements), the visual quality of the constructed scene, and therendering speed on the VR device. This paper proposes a reconstruction systemthat simultaneously meets all three goals. The key idea is to avoid theresource-demanding process of reconstructing a high-polygon mesh altogether.Instead, we propose to directly transfer details from the original point cloudto a low polygon mesh, which significantly reduces the reconstruction time andcost, preserves the scene details, and enables real-time rendering on mobile VRdevices.  While our technique is general, we demonstrate it in reconstructing culturalheritage sites. We for the first time digitally reconstruct the Elmina Castle,a UNESCO world heritage site at Ghana, from billions of laser-scanned points.The reconstruction process executes on low-end desktop systems withoutrequiring high processing power, making it accessible to the broad community.The reconstructed scenes render on Oculus Go in 60 FPS, providing a real-timeVR experience with high visual quality. Our project is part of the DigitalElmina effort (http://digitalelmina.org/) between University of Rochester andUniversity of Ghana.

Digital Reconstruction of Elmina Castle for Mobile Virtual Reality via Point-based Detail Transfer