On the set of a virtual film production, the cast and crew know what's real and what's virtual. But, for the audience, the two should be seamless. So how do filmmakers decide what should be real versus virtual? Your first instinct might be to make as much virtual as possible. This line of thinking has apparent advantages. With virtual production, you don't have to worry about sourcing physical set dressing. Virtual production also makes modifying digital assets—like changing the color or size of digital props—a breeze.