CAD system

GiD is a CAD system that features the widely used NURBS surfaces (trimmed or not) for geometry definition. A complete set of tools is provided for quick geometry definition and edition including typical geometrical features such as transformations, intersections or Boolean operations.


GiD allows the generation of large meshes in a fast and efficient manner for surfaces and volumes. Unstructured, semi-structured, structured, embedded or Cartesian meshes can be generated, as well as 2D and 3D anisotropic meshes (boundary layer).

Several element types are supported (triangles, quadrilaterals, circles, hexahedra, prisms, tetrahedra or spheres) considering also different degree of elements: linear and quadratic. Several mesh editing tools allow users to have full control of any type of mesh. A plug-in system allows incorporating external volume meshers inside GiD.

CAD cleaning & repairing

Several automatic CAD cleaning operations are performed automatically when importing a geometrical CAD model. There are also a handful of graphical tools to detect errors and repair geometries allowing the generation of a proper mesh for the simulation.

Some of the meshers integrated in GiD reduces to the minimum the need of repairing operations and they are able to generate a mesh directly from the imported geometry, even with non-watertight volumes.

Geometry reconstruction

GiD includes tools to convert any surface mesh into a NURBS surfaces representation. This has many advantages when dealing with discrete data as input for the numerical simulation (for example medical images, 3D scanners, etc.), as smooth representation of CAD data, memory savings and access to CAD edition tools.

Assign data to geometry or mesh

Easy assignment of any kind of data to geometry or mesh (boundary conditions, material properties, loads, etc.). Geometrical and mesh entities can be organized in Layers and Groups, where analysis data can be assigned to. This information along with other simulation properties can easily be sent to the solver thanks to GiD’s customization features.

Isogeometric analysis (IGA) support

GiD includes IGA capabilities for modelling, pre- and postprocessing and visualization of results on NURBS based geometries.

  • GiD’s powerful CAD system working with trimmed NURBS surfaces.
  • Exchange NURBS geometries with various formats (IGES, STEP, ACIS …).
  • Graphical assignment of materials, boundary conditions, loads, B-Rep properties, coupling information, etc. directly to the geometry.

Import & export

  • CAD geometrical data can be read in IGES, STEP, Parasolid, ACIS, VDA, DXF, KML (Google Earth), Shapefile and Rhinoceros file formats. Also several cartographical and topographical formats are supported.
  • Following a customized template, all information (mesh and simulation data) is exportable in any format.
  • The geometry export formats are IGES, ACIS, STEP, DXF or Rhino.
  • Mesh data can be read in NASTRAN, STL, VRML, 3DStudio, CGNS, VTK and other formats.

Advanced visualization tools

  • Stereoscopic view: a model can be managed interactively in 3D, and stereoscopic snapshots and animations can be generated.
  • Shadows: providing a better depth perception of the 3D model and a more realistic rendering.
  • Environment reflection: an environment can be defined to be reflected on the model, useful to detect surface imperfections.
  • Mirror and floor effects: a virtual floor can be defined to be used as a mirror, or to project the shadow of the model onto it.

What’s GiD

GiD has been designed to cover all the common needs in the numerical simulation field from pre to post processing: geometrical modeling, effective definition of analysis data, meshing, data transfer to analysis software, as well as the analysis and visualization of numerical results.

GiD: from pre to postprocessing

GiD: the universal, adaptive and user-friendly pre and post processor

  • Universal: GiD is ideal for generating all the information required for the analysis of any problem in science and engineering using numerical methods.
  • Adaptive: GiD is extremely easy to adapt to any numerical simulation code. GiD’s input and output formats can be customized and made compatible with any existing software.
  • User-friendly: A development focused on the user´s needs, provides with simplicity, speed and effectiveness for users.

GiD adaptive features

  • Multilingual: GiD GUI is adaptable to any language.
  • Multiplatform: GiD has been developed using C++, Tcl/Tk and OpenGL in order to provide the best performance and portability for MS Windows, Linux or macOS.
  • Multiple calculation options: Local and remote computing (an application is available to run calculations remotely from GiD).

Why use GiD

  • It reduces time and costs associated with numerical analysis.
  • High speed, high quality and robust meshing and data input definition reduces the analysis preparation time for complex geometries.
  • Direct use of CAD data combined with GiD geometric modeling capabilities reduces redundancy and costs associated to model creation.
  • Easy interface and communication with in-house software codes and CAD systems.
  • It reduces the learning time and improves efficiency via an intuitive graphical user interface.

Who needs GiD

  • Engineering companies eager to unify their data input and results visualization environment through a variety of numerical simulation codes.
  • Universities and R+D centers wishing to provide a user-friendly environment for pre and post processing, which would allow them to develop and use a variety of codes in computational science and engineering.
  • Engineers and scientists that want to have individual access to a powerful pre and postprocessing system for the research and application of numerical simulation codes.