Hi all (and esp @Moult if this sounds interesting to you :) ),
I will give a talk about X3D, X3D 4, PBR (Physically-based Rendering), and how it connects with glTF 2.0 this Tuesday, 29th March (so, tomorrow).
Head on to the Web3D site to register - https://www.web3d.org/pbr-x3d4-using-gltf , the talk is free and open to join for everyone. Plan of the talk is here: https://github.com/michaliskambi/x3d-tests/wiki/2022-Talk-About-X3D-PBR-glTF .