One of the most fun areas Matrix.org has worked on this year has been adding interoperable WebRTC calling to WebVR using matrix-js-sdk, A-Frame and the latest WebVR browser support and hardware (Cardboard, Rift & Vive). Rather than communication in WebVR being fragmented into different silos and websites, we hope that Matrix will provide an open decentralised ecosystem to power communication within a decentralised metaverse of WebVR environments. We'd like to show off our demo of full-mesh end-to-end encrypted videoconferencing in WebVR, as well as interoperability with the rest of the Matrix ecosystem. Finally, we're hoping to demonstrate some of our work in transmitting 3D camera depth-buffer and mesh data over WebRTC media & datachannels in order to bring 3D video calling in VR to life!