*3.2. The Importance of Preparation in Pre-Production*

Audiovisual projects such as film animation or video games are exceptionally complex, and the procedures they have been developing and turning into knowledge with their experience can certainly be beneficial to apply to a photogrammetry challenge that should

have a photorealistic final look. With this conviction, this project has assumed some of their techniques.

A key factor for the success of the project, given the restrictions that were to be experienced during data collection, was to be aware of the relevance of the pre-productionstyle decision-making process. What had been studied and agreed upon during this phase significantly determined the subsequent capacity for action, since it contained an element that was lacking in both the filming and post-production stages, i.e., time [48]. In the specialized literature, significant relevance is always given to the duration and intensity of this phase [49,50].

The first decision was to work on a draft script with a fixed number of sequences. It was prepared according to the capabilities that the project wanted to demonstrate: the creation of environments, the simulation of past scenarios with naturalness, and mastery over the scenery. This mastery was especially directed towards the fidelity of the geometry, the variety in the application of textures, and the animation of light sources.

Foresight and the careful preparation of the capture allows for decisions to be made ahead of time in terms of overcoming the main challenges, which allows more time to be dedicated to study and optimization of the workflow, thereby avoiding confusion. This factor will also help to define the areas where authenticity and accuracy are more or less important, so that the script does not conflict with the pre-production workflow of time optimization. On the contrary, storytelling should be another criterion by which to define technical parameters such as the number of polygons and their layout [17]. It is important to establish fluid communication between those who develop the script and the members of the team responsible for taking the shots and processing the digital models in order to optimize work times and effort.
