Zoom doesn't adjust correctly for globe with terrain

[birkskyum]

The globe is supposed to be rendered at the same size when changing the center, which require ongoing adjustment of the zoom level (a fixed zoom level, say zoom=2, will be much closer to earth surface at the pole than at equator).

This continuous scaling doesn't work when terrain is enabled.

Screen.Recording.2024-11-09.at.15.38.34.mov

Repro:

• the hybrid-terrain.html example can repro this without changes.
• the 3d-terrain.html examlpe, by setting projection.type to "globe" or "vertical-perspective"