as you were informed by Eric Lemoine, camptocamp and swisstopo are working on
adding 3D capabilities to the swiss geoportal  using cesium. Work is progressing
fine…and it simply looks amazing!
There are a couple of things related to cesium that is of some concern to us because
it has a huge impact on the cost of operations (mainly volume of data transferred);
which would lead to the unfortunate effect to heavily reduce the 3D appeal to our clients.
A quick analysis has shown that, depending on intial view LOD and state, 50-80% of
actual data loaded is not used for the final view. The analysis was done with terrain and
one draped layer onto the terrain.
We are currently investigating our options to influence cesium loading strategy, especially
in our use case where views are typically limited to a small part on the earth.
We would also be interested in current possibilities to tweak Cesium to:
influence current loading strategy of cesium
apply fog in distance
dynamic maximumScreenSpaceError (based on distance, LOD, etc)
generally reduce tiles/terrain loaded
Are there near term plans to address those kind of issues?