Abstract
By three-dimensional (3-D) CAD system being used rapidly, 3-D CAD system has been incorporated into the education. The design and drawing education by using 3-D CAD generally designs some parts, supports the ability to assemble the parts three-dimensionally. In that case, to check 3-D CAD data in detail, the teacher needs a lot of labors. Therefore, we have developed a system to check 3-D CAD data automatically. When the Check-Model (checked 3-D CAD data) is incorrect, it is necessary for a mechanism that checks the mistake. In order to check the mistake, the judgment of the agreement of three-dimensional shape assumed three conditions concerning the surface, "agreement of the number of surface", "agreement of the shape of surface", and "agreement of the direction of surface". This paper describes the Development of educational 3D-CAD check system.
