How do you make a mini-cam or mini-map using three.js?
Two camera views. One mini-map "mini-cam" - top right corner (see image below), and the main camera view should span the rest of the scene (the rest, without the border in image below).
N.B. This actually can't quite be done via the viewport method, as the scene shouldn't be cropped off by the x-dimensionality, but should stretch out.