How do I draw a simple line in Qt3D?

[Lindsey]

I feel like this should be pretty straightforward, but for my life I can't figure out how to draw a basic line using Qt 3D. The only guidance I've been able to find on the subject is this obscure video, in which there's an off-putting amount of raw byte buffer and memory manipulation going on via scarcely documented classes. dunkin survey

Is there a better way to do this using the shiny new API that I'm missing?