This paper is a final work for Graphic Control of Solar Light & Natural Lighting Course, which belong to the Doctorate Program Curricullum of Achitectonic Representation of the Escuela Superior de Arquitectura, Universitat Politecnica de Catalunya, in Barcelona, Spain. The main idea of this work was to find and to describe the advantages of informatics and technology tools used for the study of the solar obstructions. The traditional technique adopted in our graduate course was static and repetitive. What would had to be a system of analysis of natural light behaviour and the influence produced by the buildings around, as a constructed medium, was presented as a drawing exercise in spherical perspective. Our work was well received not only because we obtained a complete luminic analysis, correct, expressive and realistic, but too, as a research in which clearly appears the multiple tools offered by technology to realize such a study.