Digital 3D visualization of film scenes using game engines like Unity/Unreal before principal photography; reduces on-set time by 15–25%.
Technical Details
Previz utilizes game engine-based rendering systems like Unity or Unreal Engine 4/5, enabling real-time rendering at 60-120fps. Standard working resolutions are 1920x1080 pixels, with final previz deliveries outputting in 2K (2048x1080) or 4K (4096x2160). Typical scenes contain 50,000-500,000 polygons per frame. Three main variants exist: Gray-Boxing (simple geometric shapes), Techviz (technically precise models), and Postviz (post-production visualization of already shot plates).
History & Development
In 1977, Douglas Trumbull developed early computer-assisted previz techniques for "Close Encounters of the Third Kind." Industrial Light & Magic established digital previz as a standard workflow with "Jurassic Park" in 1993. In 2002, Colin Green founded The Third Floor, the first specialized previz studio. With "Avatar" (2009), previz reached a new quality level through Virtual Production integration. Since 2018, real-time ray-tracing graphics cards like the NVIDIA RTX series have enabled photorealistic previz in real time.
Practical Application in Film
"Mad Max: Fury Road" used 2,400 previz shots for the entire chase sequence choreography. Marvel Studios produces an average of 800-1,200 previz shots per film, with 40-60% of the final camera work being adopted. The workflow includes script breakdown, 3D layout, animation, and review cycles of typically 3-5 iterations per sequence. Previz reduces set time by 15-25% but increases preproduction duration by 8-12 weeks.
Comparison & Alternatives
Storyboards visualize statically; previz moves. Animatics combine 2D boards with camera movement but do not achieve the spatial precision of 3D previz. Techviz focuses on exact technical feasibility, while Postviz combines already shot material with planned VFX elements. Virtual Production partially replaces previz with direct LED volume shooting but costs €50,000-€80,000 per shooting day compared to €3,000-€5,000 per previz minute.