State of the art of garment CAD development consists in thetransition from implementation of the automated analysis at separate stages tointellectual complex system creation that provides informational unity of thewhole product life span.
Nowadays, initial steps of cloth design actually areeliminated from CAD/CAM process line. Visual shape formation factors of model,such as primary description of design object and main esthetic criterion ofdeveloped model, are completely not taken into account in modern systems.Thats why creation of garments artistic design subsystem is necessary inautomated system for improving conceptual decision of models form.
Initial step of cloth design is garment sketch design whichat the present moment is implemented by two different methods. The first one isformation and decryption of flat sketch, specified as set of lines. Thesecond one is sketch design as 3Dimensional model, it means as set of flat andspatial lines. Sketch design in both cases is implemented in modern CADsystems by the means of computer graphics, though decryption of sketch with theaim of achieving parametric information for construction of involute of modelsurface completes by constructor subjectively, without automated systemsupport.
A whole number of scientific researches, directed todevelopment of sketch design methods in 3D CAD, were made in the MGUDT in orderto design intellectual 3D sketch module. The most optimal method of garmentvisual form design in automated system was defined on the base of the analysisof consecutive estimation of garment compositional decision process.
This method is based on the formation of graphic image withthe usage of basic form elements, such as volumetric geometric figures.
Scheme of the consecutive formation 3dimensional sketch asexample of female dress is represented at the pic.1.
Succession of sketch formation consists of three steps:
- basic form selection,
- basic form edition,
- modeling of the visual form.
At the first step, according to the visual estimation,comparison of the model form with geometric figures that already exist in thedata base, takes place. This way the features that describe volumetricgeometric form of the garment are defined.
Secondly, new geometric features of the form concerning thebasic form of the element are determined. Thereby geometric features of theform are defined.
Third step defines constructive and compositional meanstowards achievement of specified model form. They characterize special featuresof the form, it means define modeling method.
Developed method of the 3D sketch design provides its ownself-descriptiveness, as for the needs of CAD, as for the needs of engineer-constructor. Information about peculiarity of model form geometric type can beused for definition of the garment form design methods and for the modelingmethods selection.Parametric information of the 3 Dimensional garmentvisualization enables one to define necessary values and factors duringconstruction development.
Advantage of such method of the 3D sketch design is the ability of using formerly included geometric forms in the system. This step allows user to avoid labor-intensive process of graphic visualization design for every new garment. Design of different compositional decisions of the model is achieved by the combination and regulation methods of the basic element form values. They can be of three types: elliptical or sphere- shaped; cylindrical and cone- form. At the pic.2 you can see versions of basic elements form combinations.
Introduced approach has a row of significant advantages because it ensures accuracy and consistency of engineering process, and also exposes modelors creativity. This approach allows user to cope successfully with the task of complex and combined cut garment construction design. Because modeler, while working with the 3 Dimensional model, achieves objective information about virtual garment form and persons body interrelation.
About the Authors
Getmanzeva V.V. is Senior Lecturer of the GT department, Razin I.B. is Associate Professor and Head of CAD department, Andreeva E.G. is Professor and Head of the GT department.
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