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The techniques of representation by digital photogrammetry and laser scanning make it possible to obtain accurate three-dimensional models and are necessary to support the production of documents about built heritage, a process that can trigger advances in knowledge concerning the represented object. Through these technologies, a study is carried out to generate information about two elements of the eclectic architecture of Pelotas, one of them, the half-dome of a Chapel, authored by José Isella, and the other, the skylight of a mansion, which still has unproven indicators regarding its authorship. An analysis of formal organization under a geometric approach whas used, to identify aspects as that cloud increase or refute personal doubt. The associative logic between the parts of the elements and the mastery in controlling the anamortic effects promoted by these elements increase the hypothesis that Isella is also responsible for the skylight design