**2. Distance learning of engineering graphics**

When teaching basic subjects of undergraduate engineering courses, such as Descriptive Geometry and Technical Drawing, it is necessary to introduce new technologies that help the students learning. Learning can be achieved using the traditional face to face way or by the most recent remote way by means of what is called e-learning or distance learning.

One of the first things an undergraduate in engineering has to study, as part of the core matters of knowledge, is Technical Drawing or Engineering Graphics as the threedimensional (3D) perception of the students in those technical programs is based on Descriptive Geometry. Descriptive Geometry involves the study of different representation systems and more specifically the Orthographic Projection. The orthographic projection, derived from the Gaspard Monge Descriptive Geometry, gives the foundations of the Engineering Drawing and is usually included in most first years of engineering studies. The main disadvantage of the representation systems is that they are based on the work with the projections of the objects and not with the 3D objects directly. Therefore, the students have to develop, if they do not have, the ability to think spatially and operate in the plane in pencil and paper.

The traditional core technical subjects, as Technical Drawing, can be helped to be taught and, what is more important, to be understood by the students by the new technologies and by the new design tools. Any activity in this sense is not enough to help the students to acquire the skills to see and work in 3D. As any other undergraduate courses, Engineering Graphics has to adapt, as well, to the new procedures of distance learning. Many researchers and teachers are involved in this new trend but not many references have been found by the authors (Toledo & Rojas, 2001; Rubio et al., 2007; Morales et al., 2009; Rubio et al., 2010) in which the distance learning is applied to the aforementioned technical field. It is therefore very important to develop tools or/and web applications that allow the introduction of this kind of subjects to the distance learning through the Internet.

The main goal of distance learning in Engineering Graphics or Descriptive Geometry is to search for alternative methods to improve the education-learning process of multiple projection systems focused on high school or undergraduate university programs. Two aspects have to be taken into account:

