See also: CAD

The drawing computer-assisted (CAD) is a whole of techniques making it possible to produce drawings with a computer software. One distinguishes it from the Synthèse of image insofar as it is not a question of the calculation of returned of a digital model but of the execution of graphic orders (milked, various forms…). So in CAD, the mouse and the keyboard replace the pencil and the other instruments of the draftsman. The user of a tool CAD must know, in addition to the handling of the computer, conventions of representations applied.

The produced drawings are generally carried out in vectorial mode (milked coherent), whereas the synthesized image is an association of independent pixels Bitmap. In other terms, the software of CAD allots coordinates (X, Y for the plans 2D and X, Y, Z for the models 3D). Each elements of a drawing is called Entités and each entities thus contains properties of colors, thickness, copy, type of line, etc…

The interest of the CAD, is initially that of data processing, i.e. primarily a contribution of feasibility in management of the documents, facilitating the edition of modifications, filing, the reproduction, the transfer of information, etc

There exists as much of software of CAD than of trades using the drawing. The mechanic, the architect, but also the electronics specialist and the geometrician have tools today facilitating the creation of a plan, a diagram, with directed orders trades, adapted databases, and also of the catalogs of components provided by the manufacturers.

There is thus relation between the CAD and the technique DIGITAL of DMA (or DIGITAL Matte Artist , Peinture hiding place numerical).

The major part of time, the very many Technical digital used to create a Peinture hiding place made with the assistance of the Informatique will use the CAD in order to create the major part of the effects not being able to be created using the Numeric photography. One will be able to say that the operator uses the system to express himself, to bring to work what technology cannot create automatically.

The elements Bitmap contained in painting hiding place are: various photographs or one paints masks to synthesize the images units. One can thus say that the CAD (best the painter hides have the major part a good academic formation in drawing computer-assisted) or some of its Techniques of calculation computerized are seen transferred towards a new under-field.

One often confuses CAD and CAD: the CAD does not have as a function the first edition of the drawing. It is about computer tools often related to a trade, functioning in language object says, and allowing the virtual organization of technical functions. That allows then the simulation of behavior of the designed object, the possible edition of a plan or an automatic and additional diagram being. In CAD, a feature is a feature and the software does not allow the technical interpretation of the unit.

The CAD is especially used by format CGM (Computer Graphic Metafile). Format CGM makes use very little of the CAM. It is very little used in data processing owing to the fact that it cannot be read and writes only by the principal design software vectorial. Certain software of final improvement of images can only read it. It codes the colors in RVB), and is thus not intended for the paper impression.

See too

• software Category of CAD