5 years ago I experimented with going underground in Cesium.
A major thing I noticed was the grid of skirts (same phenomenon with Google Earth)
I see that this new version of Cesium fixes that, and it looks great!
Another change I’ve noticed is the showing of textures for surface normals facing away from the camera, very cool!
Maybe show a orange (magma) ‘sky’ indicating that you’re underground so you don’t start thinking that mountains are valleys! Like the blue sky above, the orange sky below gets lighter (or darker) the closer you look toward the center of the Earth.
I noticed that while getting close to a surface it turns transparent so you can see through it which is awesome! (just noticed you’ve listed vars regarding this on the 1st post.) Perhaps this Superman X-ray mode could be expanded allowing you to through multiple overlapping surfaces. This would allow one to see a road surface behind a mountain. Currently you have to go into a mountain to see a road or valley behind it. Basically show all overlapping transparently, except the last surface. Granted this might end up looking very messy with too many overlapping transparencies, perhaps limiting to 2 or 3 would work OK. Each layer with a different alpha value.
This new feature can assist in planning of future tunnel systems. I believe that underground tunneling is the future of intra-continental transportation, even down to the local level in high population density areas. Hyperloop makes alot of sense. I think Elon Musk realized that putting it underground makes the most sense when he created the Boring company a few years ago.
By going underground:
-you can eliminate wasted energy of going up and down that you deal with by following surface terrain contouring.
(aircraft taking off and gaining 30k+ feet altitude is wasted energy as well, and it can crash)
-maintaining an air seal in the tubes is easier with tunnels (a small break in the tube is no big deal, air isn’t going to start rushing in.)
Low pressure tubes:
-Aircraft travel at high altitudes for low density air (low friction), the same can be obtained with low pressure tubes
-Jets use fossil fuel so they pollute. Tubes can use electric energy gathered from renewable energy sources
With a tube system you can have ‘tube ports’ all over the place. Aircraft are limited to a few ‘air ports’.
Underground density mapping might be useful for tunneling. Perhaps low density paths can be found, avoiding having to slowly bore through very dense rock.
Ancient buried city discovered without digging, would be neat to see this displayed in Cesium.
EDIT: just noticed this article from 2 days ago
Perhaps Cesium could reach out to the Boring Company and/or these casinos, demonstrating the underground tunnel visualization capabilities.