So far we used a fixed vertical range for 3D bounding boxes with range [0, 500]
This of course would not work well if Z values are outside of this range
(e.g. tiles may not show at all or get pruned prematurely)
The approach now is to start with an estimate of the vertical range based
on few features from the source vector layer and then once our tile is completely
loaded, update the 3D bounding box to better represent the actual 3D extent.
