If you want to try on your phone https://output.jsbin.com/votuvi or better make your scene using some models from https://learnwebvr.xyz/upload/AirbusJune2017/assets/
Exercise : clone that demo hide that little personage in a forest of tree, make it as realistic as possible.
Extra exercise : what's missing to make that scene much more realistic beside a nice smell of pine trees and glacial temperatures?
Curious about how meshes will be done in the near future? Check the Past VR painting workshop.