Hi,
Thanks for the follow-up question. No, at the moment we don’t see this as aligned with our roadmap. Our goal is to allow users to stream terrain data efficiently, and 3D Tiles is the best option for that. glTF is of course valuable to us and our users, but for the purposes of streaming terrain, our focus is on converting DEM to 3D Tiles.
If you run a couple searches through the CesiumJS forum, there may be other ways of doing what you are trying to do. I took a quick look, and it seems like your goal may be tricky to accomplish (e.g., this thread), but the discussion may prove informative to you nonetheless.
Thanks,
Matt