At Wednesday's Billboard Music Awards, Madonna performed her latest single, "Medellín", with Latin singer Maluma. However, they (and their flesh-and-blood dancers) weren't alone on the Las Vegas stage. Several virtual versions of the pop icon joined them: a secret agent, a musician, a cha-cha instructor and a bride. Augmented reality brought Madonna's personas to life with the help of volumetric capture -- essentially 3D video -- and Unreal Engine.