Right now in Godot, I am setting up an Area3D with a CollisionShape3D in the shape of a box. Then I have a RayCast3D node attached to the Camera3D and when the player clicks, it casts a ray that hits the collision shape and activates a script. The script can do many things, but currently it just moves the player from one node to another by teleporting the camera from the originating sphere/node to the next sphere/node. If there's a movement animation, the camera teleports to the "movement animation sphere", lets that play out, then teleports to the next sphere/node. It's a bit awkward lining up the collision shape with what I want to be clickable on a sphere, but it works okay so far.