Is there an option to draw the current path in the Game View, in the same manner it shows up in the Scene View?
The path is rendered using Gizmos, meaning they will not show up in the game. However in the editor you can make it show up in the GameView by ticking the toggle which says “Gizmos” (possibly disabling 3D gizmos as well) next to the GameView screen.
Ah, Thanks. That is what I needed for now!
I need to know how to render the path in the game (and builds) as a 3D spline / cylinder / line / whatever. I need to be able to see the path in a build. How would I go about this?
There are various ways to do this. You could try the unity line renderer (https://docs.unity3d.com/Manual/class-LineRenderer.html) or a 3rd party library such as Vectrocity (https://www.assetstore.unity3d.com/en/#!/content/82).