The Bundler import tool and associated methods (orthophotos generation as images or clouds, colored DTM generation, etc.) have been developed in association with Pr. Irwin Scollar, creator of the AirPhoto SE software (A Program for the geometric rectification of aerial images & orthophotos from multiple images).
This (great) software uses internally the Bundler tool to perform automatic intrinsic and extrinsic camera calibration from multiple aerial images.
In order to generate very easily a set of files compliant with the dedicated importation tool in CloudCompare in order to generate orthophotos, just follow the AirPhoto SE tutorial about "Orthophotos".