Which of the following techniques is NOT typically used to create realistic backgrounds in film?

Set building is a fundamental aspect of film production that involves constructing physical sets to create realistic environments for a scene. This method allows filmmakers to have direct control over the design, lighting, and spatial relationships within the scene, making it a primary technique used to set the stage for any film narrative.

On the other hand, matte paintings, blue screen techniques, and models and miniatures are more specialized methods that can be employed to enhance or create backgrounds, especially in scenarios where real locations are impractical or impossible to film. Matte paintings use artistic renderings to create expansive backgrounds; blue screen allows filmmakers to composite various elements together digitally, creating environments that wouldn't be feasible to physically construct; and models and miniatures provide a scaled-down representation of real-world objects or locations, often used in special effects.

Given that set building directly contributes to creating realistic settings, it stands apart from the more supplementary and specialized techniques utilized to achieve background realism in film.