Intersection of two paths given start points, bearings and elevations

[vinnitu]

Hello!

I saw page Intersection of two paths given start points and bearings part.
This example works on the ground only. But what if start points have altitude coordinate and elevation angles to target.
Can we use this code to determine intersection point in 3d?

In my case it is drone with radiotransmitter and antennas directed to it. And we still know (lat, lon, alt) with bearings(azimuths) and evelevation angles to drone. How to calculate (lat, lon, altitude) of drone?