I have modified this sandcastle a little bit, with the settings of the viewer, which are used in our case and set ._maximumUndergroundPickDistance to 80000.0
Unfortunately, I can’t restore the old (<1.70) camera behavior with this setting.
The area marked as “1” in the screenshot above is slightly extended by modifying this setting, but as soon as the camera is just a little bit deeper in the space of the earth’s interior, the camera turns around itself again when clicking the mouse wheel, like described for area “2”.
Is there no way to activate the previous camera behavior? This worked fine and behaved like the camera above the earth’s surface.