**Different Kinds of Virtual Humans**
*Today, I am seeing three broad categories of virtual humans:*
1. *Mathematical model-based*
1. *Generative AI*
1. *3D Models*
*All three terms are slightly problematic. As far as I know there is not really a distinct term for mathematical model-based human digital twins. They might be described as “virtual-virtual beings”, due to their ghost-like nature. The term “Synthetic Media” seems to be changing from neural network based media to a more broad umbrella. “Deepfakes” are generally defined as being used for malicious purposes. “Generative AI” seems to work best now to describe asynchronous neural network based media. “CGI” is also fraught with contradictions. Technically, it is all computer generated “imagery”, and technically it is all mathematically based. *