next category previous category

~~Cad~~
**_CAD definition:**
computer-aided design

ID: _CAD005741

~~Cad~~
**_Definition vector graphics:**
a vector graphics describes a picture through mathematical functions in a 2 or 3-dimensional coordinate system. vectors define lines, curves or surfaces, different than a raster graphics, that stores pixel.

In order to store for example the picture of a circle, a vector graphics requires four values: the situation of the circle center, the circle diameter, the color of the circle line and her/its/their line strength.

Vector graphics can scale infinite in contrast to raster graphics without Qualitätsverlust and become twisted.

Furthermore the qualities of individual lines, curves or surfaces remain gotten with vector graphics and can still be changed also later.

Vector graphics are inappropriate for the representation of complicated pictures like photos since these can be modeled hardly mathematically.

Each pixel would have to be modeled in the extreme case through a surface like approximately a square, through what the benefit of the vector graphics lost, would go. programs, that land on vector graphics, are, for example,:

* CAD programs like AutoCAD, CATIA and ProEngineer. the 2D-CAD-Programm QCad, it takes second place little to commercial products. * illustration programs like for example Freehand, Adobe illustrator, CorelDraw or Xara Xtreme.

Under KDE, there are Kontour and Karbon 14. still, there are the Open Source-Programme Sodipodi and Inkscape to producing of vector graphics under Linux and Windows (Inkscape also for Mac OS X).

In the LaTeX-Community, the program Xfig (under Linux and Mac OS X) is very far widespread. * 3D-Computergrafik-Programme. on the Open Source-Seite, there is in the three-dimensional area POV-Ray, VRML and also phoneys and Wings3D (Modeller). sources:

Wikipedia.

ID: _Defi06035

~~Cad~~
**Euclid **
is a CAD software which has been developed since 1970. Initially written by Jean Marc Brun and Michel Théron at Laboratoire d'informatique pour la mécanique et les sciences de l'ingénieur (LIMSI) for modelling fluid flow, they founded their own company, Datavision in 1979 and then sold a controlling interest in 1980 to the French company Matra Datavision.

Matra then developed EUCLID QUANTUM ,a new generation in 1996, on the CAS.CADE (Computer Aided Software for Computer Aided Design and Engineering) platform. As in 1998 Matra Datavision specialized in software service provider, Dassault Systèmes acquired QUANTUM products : Euclid Styler and Euclid Machinist.

In 1999 Matra Datavision published CAS.CADE in open source on the Internet as Open CASCADE later renamed to Open CASCADE Technology.

The BRL-CAD CAD software imports and exports to the EUCLID file format.

ID: Eucli08875

~~Cad~~
**UNISURF **
was a pioneering surface CAD/CAM system, designed to assist with car body design and tooling. It was developed by French engineer Pierre Bézier for Renault in 1968, and entered full use at the company in 1975.[1][2] By 1999, around 1,500 Renault employees made use of UNISURF for car design and manufacture

ID: UNISU08874