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3.1 Interactive mode 3.2 Non-interactive mode 3.3 Command-line options 3.4 Mouse actions 3.5 Keyboard shortcuts
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To launch Gmsh in interactive mode, just double-click on the Gmsh icon, or type
> gmsh |
at your shell prompt in a terminal. This will open two windows: the graphic window (with a status bar at the bottom) and the menu window (with a menu bar and some context-dependent buttons).
To open the first tutorial file (see section A. Tutorial), select the `File->Open' menu, and choose `t1.geo' in the input field. When using a terminal, you can specify the file name directly on the command line, i.e.:
> gmsh t1.geo |
To perform the mesh generation, go to the mesh module (by selecting `Mesh' in the module menu) and choose the dimension in the context-dependent buttons (`1D' will mesh all the lines; `2D' will mesh all the surfaces--as well as all the lines if `1D' was not called before; `3D' will mesh all the volumes--and all the surfaces if `2D' was not called before). To save the resulting mesh in the current mesh format click on the `Save' button, or select the appropriate format and file name with the `File->Save As' menu. The default mesh file name is based on the name of the current active model, with an appended extension depending on the mesh format(3).
To create a new geometry or to modify an existing geometry, select 'Geometry' in the module menu, and follow the context-dependent buttons. For example, to create a spline, select `Elementary', `Add', `New' and `Spline'. You will then be asked to select a list of points, and to type e to finish the selection (or q to abort it). Once the interactive command is completed, a text string is automatically added at the end of the current script file. You can edit the script file by hand at any time by pressing the `Edit' button in the `Geometry' menu and then reloading the model by pressing `Reload'. For example, it is often faster to define variables and points directly in the script file, and then use the GUI to define the lines, the surfaces and the volumes interactively.
Several files can be loaded simultaneously in Gmsh. The first one defines the active model and the others are `merged' into this model. You can merge such files with the `File->Merge' menu, or by directly specifying the names of the files on the command line. For example, to merge the post-processing views contained in the files `view1.pos' and `view5.msh' together with the geometry of the first tutorial `t1.geo', you can type the following command:
> gmsh t1.geo view1.pos view5.msh |
In the Post-Processing module (select `Post-Processing' in the module menu), three buttons will appear, respectively labeled `A scalar map', `Nodal scalar map' and `Element 1 vector'. In this example the views contain several time steps: you can loop through them with the small "remote-control" icons at the bottom of the graphic window. A mouse click on the view name will toggle the visibility of the selected view, while a click on the arrow button on the right will provide access to the view's options.
Note that all the options specified interactively can also be directly specified in the script files. You can save the current options of the current active model with the `File->Save Options' menu. This will create a new option file with the same filename as the active model, but with an extra `.opt' extension added. The next time you open this model, the associated options will be automatically loaded, too. To save the current options as your default preferences for all future Gmsh sessions, use the `File->Save Default Options' menu instead. Finally, you can also save the current options in an arbitrary file by choosing the `Gmsh options' format in `File->Save As'.
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Gmsh can be run non-interactively in `batch' mode, without GUI(4). For example, to mesh the first tutorial in batch mode, just type:
> gmsh t1.geo -2 |
To mesh the same example, but with the background mesh available in the file `bgmesh.pos', type:
> gmsh t1.geo -2 -bgm bgmesh.pos |
For the list of all command-line options, see 3.3 Command-line options.
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Geometry options:
-0
-tol float
Mesh options:
-1, -2, -3
-part int
-saveall
-o file
-format string
-bin
-algo string
-smooth int
-optimize[_netgen]
-order int
-clscale float
-clmin float
-clmax float
-clcurv
-rand float
-bgm file
Post-processing options:
-noview
-link int
-combine
Display options:
-nodb
-fontsize int
-theme string
-display string
Other options:
-
-a, -g, -m, -s, -p
-pid
-listen
-v int
-nopopup
-string "string"
-option file
-convert files
-version
-info
-help
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In the following, for a 2 button mouse, Middle button = Shift+Left button. For a 1 button mouse, Middle button = Shift+Left button and Right button = Alt+Left button.
Move the mouse:
Left button:
Ctrl+Left button: Start a lasso zoom or a lasso selection/unselection
Middle button:
Ctrl+Middle button: Orthogonalize display
Right button:
Ctrl+Right button: Reset to default viewpoint
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(On Mac Ctrl is replaced by Cmd (the `Apple key') in the shortcuts below.)
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