For complex or technically challenging sequences—such as large action scenes, detailed effects shots, or intricate camera moves—the pre-production team often undertakes a dedicated Previsualization (Previs) stage. Previs involves creating a simplified, low-fidelity 3D version of the scene using simple geometry, temporary textures, and basic animation to block out the action.

The purpose of Previs is purely technical and directorial: to work out the choreography of the camera, characters, and effects in 3D space. It ensures that the camera movements are physically plausible and that the scene’s complex geometry works before the high-cost production teams (modelers, texture artists, effects TDs) start their final work. It’s a dress rehearsal in a virtual space.

The finished Previs sequence is far more refined than the simple animatic and acts as a direct technical guide for the Layout and Animation departments. It provides exact camera coordinates, lens information, and movement splines, essentially handing the animators the solved geometry and cinematography, allowing them to focus purely on polishing the final performance.