Previsualization has been a part of motion picture pre-production for
decades. With the tools available today, PreVis has dramatically
improved every facet of production from story boards, set design,
car chase scripting, camera blocking, logistics, et al.
A prime benefit that previs has to pre-production is the ability to create
storyboards & camera blocking set-ups and highlight any logistical
impediments that a location may have -- *all in one* 3D model.
Gaffers can also get cable run lengths and choose proper placement
of generators and grip trucks.