While previsualization itself requires time and budget to complete, having a well-developed previs plan for how a script will be shot confers many advantages to the smoothness and efficiency of a film’s production. It allows for low-risk experimentation with a film’s artistic vision and can help inform how VFX will integrate with live action.
Previs can help directors refine their vision, alert them to potential problems, and lead to making key decisions like actor blocking, lighting, and camera placement before hitting the set. That can help cost efficiency by reducing reshoots and on-set changes. Clear previs also helps communicate production goals to everyone involved and can help sell potential investors during fundraising rounds.