Most conventional CAD systems have been proved to be Computer-Aided Drafting systems. They do not offer sufficient support for the design activity. The reason is that they cannot understand the semantic information and keep the semantic information throughout the whole design process. The semantic information here means the functional requirements on the design product. The designer is responsible for maintaining the functional requirements in different design phases. This is such a heavy burden for him that he cannot concentrate on the creative part of the desgin activity. In this book a new constraint- based geometric modelling method is introduced. This method combines the advantages of the three existing methods. Object- oriented concept is used to develop this method. The implementation of a CAD system called RelCAD', based on this method, is also introduced in this book.
Most conventional CAD systems have been proved to be Computer-Aided Drafting systems. They do not offer sufficient support for the design activity. The reason is that they cannot understand the semantic information and keep the semantic information throughout the whole design process. The semantic information here means the functional requirements on the design product. The designer is responsible for maintaining the functional requirements in different design phases. This is such a heavy burden for him that he cannot concentrate on the creative part of the desgin activity. In this book a new constraint- based geometric modelling method is introduced. This method combines the advantages of the three existing methods. Object- oriented concept is used to develop this method. The implementation of a CAD system called RelCAD', based on this method, is also introduced in this book.
