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In the stages of understanding and study, by students, of descriptive geometry, the treble orthogonal projection of a point, creates problems in the situations in that one or more descriptive coordinates are zero. Starting from these considerations the authors have created an original computer program which offers to the students the possibility to easily understanding of the way in which a point is represented, in draught, in the treble orthogonal projection whatever which are its values of the descriptive coordinates.

In this paper the authors present a study and the conclusions they reached, regarding the possibility to automatically representing a pergola, when a CAD system is used. Also, a computer program, made by the authors is presented. This software was named Pergola and it offer the opportunity to sketch a pergola which cover a rectangular or circular area, when using the AutoCAD Architecture or AutoCAD computer program.

The paper presents the authors’ contributions for developing a computer code for teaching of descriptive geometry using the computer aided learning techniques. The program was implemented using the programming interface and the 3D modeling capabilities of the AutoCAD system.

In the steps preceding the dimensioning and printing of a technical drawing for construction, a series of settings must be made which, if not done correctly, make that the printed drawing and the elements represented in that drawing not comply with the rules of the technical drawing for constructions and the representations made are not correctly understood. Bearing in mind these elements, the authors have developed an original computing program that works on the AutoCAD software interface, which helps users make the necessary settings so that the sheets will finally respect the technical drawing rules regarding the correct use of the print format, of choosing of the title block, of the scale of representation, and the optimal view of delimiters and quota values. [ABSTRACT FROM AUTHOR]

Sometimes, in the drawing's process of a part, it is necessary to be determine a plane by using the value of the dihedral angle between this and another plane, which is already known. The authors did not find in the literature solutions for this problem, but they observed that can be easily found only methods for measuring of the dihedral angle. Starting from these considerations, in this paper, the authors propose two solutions for specifying a plane by using the dihedral angle, then compares them and recommend one of the two. Finally, the authors present the solutions offered for this problem by the computer programs when 3D model is used. [ABSTRACT FROM AUTHOR]

The technical drawing is one of the fundamental disciplines that helps to the forming of the students because, it offers all the rules through that the engineering drawings are correctly achieved. Also, the knowledge acquired to this discipline, during the years of study, help the specialists, from the domain of the technical sciences, to understand the drawings, thus giving them the possibility to obtain the elements represented in drawings. Starting from these data the authors have proposed and have accomplished a statistical analysis through which to observe, on a sample of students, the steps that raise the most difficulties in the activity of achieving of a technical drawing because this activity, in addition, requires understanding of the elements that must represented.

In this paper the authors make a critical analysis of the advantages offered by the parametric drawing use by comparison with the AutoLISP computer programs used when it comes about the parametric design. Studying and analysing these two work models the authors have got to some ideas and conclusions which should be considered in the moment in that someone must to decide if it is the case to elaborate a software, using the AutoLISP language, or to establish the base rules that must be followed by the drawing, in the idea to construct outlines or blocks which can be used in the projection process.