Convert viewer camera state to BCF perspective camera
BCF uses direction vector instead of look-at point. Direction = normalize(target - position)
Also converts from viewer's Y-up to BCF's Z-up coordinate system.
Convert viewer camera state to BCF perspective camera
BCF uses direction vector instead of look-at point. Direction = normalize(target - position)
Also converts from viewer's Y-up to BCF's Z-up coordinate system.