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Convergent photogrammetry is achieved by taking multiple images from different angles to capture a three-dimensional representation of a subject. This technique relies on the principle of triangulation, where images taken from various viewpoints allow for the calculation of depth and spatial relationships among points within the scene. Each photograph serves as a unique perspective, and when these images are processed—often using specialized software—data can be extracted to create accurate models or measurements of the object being photographed.

This method significantly enhances the ability to gather detailed geometric information as opposed to using a single viewpoint, which lacks the depth information needed for three-dimensional reconstruction. Furthermore, relying solely on film-based cameras or manual measurement techniques does not align with the advanced capabilities and efficiencies that convergent photogrammetry offers. Different angles are essential for a comprehensive understanding of the subject's form and structure, making the chosen option the most accurate representation of how convergent photogrammetry works.