GLVis visualization tool

                 _/_/_/  _/      _/      _/  _/
              _/        _/      _/      _/        _/_/_/
             _/  _/_/  _/      _/      _/  _/  _/_/
            _/    _/  _/        _/  _/    _/      _/_/
             _/_/_/  _/_/_/_/    _/      _/  _/_/_/

                          http://glvis.org

GLVis is an OpenGL tool for visualization of finite element meshes and functions.

For building instructions, see the file INSTALL. Copyright information and licensing restrictions can be found in the file COPYRIGHT.

When started without any options, glvis starts a server which waits for a socket connections (on port 19916 by default) and visualizes any received data. This way the results of simulations on a remote (parallel) machine can be visualized on the local user desktop.

GLVis can also be used to visualize a mesh with or without a finite element function (solution), as in 'glvis -m cube.mesh3d'. For parallel computations, GLVis supports input from several parallel socket connections as well as the visualization of parallel meshes and grid functions saved in separate files from the command line as in 'glvis -np 4 -m mesh -g solution'. In both cases, it will stitch the results to show the global mesh and solution. GLVis can also run a batch sequence of commands (GLVis scripts), or display previously saved socket streams. For a complete list of command line options, type 'glvis -h'.

Depending on the data type, variety of manipulations can be performed by using the mouse and by typing (case sensitive) keystrokes in the GLVis window. Here is a partial list of the available functionality. Some of these keys can also be provided as input, using the '-k' command-line option and the 'keys' script command.

GLVis is distributed under the terms of the BSD-3 license. All new contributions must be made under this license. See LICENSE and NOTICE for details.

SPDX-License-Identifier: BSD-3-Clause LLNL Release Number: LLNL-CODE-443271 DOI: 10.11578/dc.20171025.1249

Mouse functions

Left - Rotate the viewpoint Middle - Translate the viewpoint Right - Zoom in (up) / Zoom out (down) Left+Shift - Start spinning the viewpoint (according to dragging vector)

Basic key commands

h - Prints a short help message in the terminal

r - Reset the plot to 3D view R - Cycle through the six 2D projections (camera looking in +/- x/y/z direction) j - Turn on/off perspective s - Turn on/off unit cube scaling

c - Toggle the colorbar and caption display state C - Change the main plot caption p/P Cycle forward/backwards through color palettes (lots of options, use F6 for a menu) t - Cycle materials and lights (5 states) l - Turns on/off the light g - Toggle background color (white -> black)

a - Toggle the bounding box axes The options are: -> none -> bounding box with coordinates of the corners -> bounding box without coordinates -> red, green, blue colored main x, y, z axes; dashed box m - Toggle the "mesh" state The options are: -> no mesh or level lines -> draw the element edges (i.e. the mesh) -> draw the level lines (use F5 to modify the level lines) e - Toggle the "elements" state (see below for vector functions) The options are: -> show surface elements (corresponding to the function) -> show no surface elements -> show element attributes (2D) -> show element det(J) (2D) -> show element 1/det(J) (2D) -> show element kappa (2D) -> show element kappa + 1/kappa (2D)

S - Take an image snapshot or record a movie (in spinning mode). By default, the screenshots are taken in png format, using libpng. When GLVis is compiled with libtiff support (see INSTALL) then the screenshots are taken internally and saved in TIFF format (.tif extension). If both of these options are disabled during the build process, GLVis will use SDL to take screenshots in bmp format, which it will then convert to png if ImageMagick's 'convert' tool is available.

Ctrl+p - Print to a PDF file using gl2ps. Other vector formats (SVG, EPS) are also possible, but keep in mind that the printing takes a while and the generated files are big.

q - Exit

Advanced key commands

f - Change the shading type (the way the elements and mesh are drawn) The options are: -> one triangle / quad per element with a constant normal -> one triangle / quad per element with normals averaged at the vertices -> multiple triangles / quads per element, also allowing for the visualization of discontinuous functions and curvilinear elements (use o/O to control subdivisions)

o/O - Control element subdivisions (2D) there are two subdivision factors: -> element subdivision factor s1 -> boundary subdivision factor s2 O - Cycle through the "subdivision functions", (prints a message in the terminal when changed) The options are: -> Increase subdivision factor: s1 += s2 -> Decrease subdivision factor: s1 -= s2 -> Increase bdr subdivision factor: s2++ -> Decrease bdr subdivision factor: s2-- o - perform the current "subdivision function"

A - Turn on/off the use of anti-aliasing/multi-sampling b - Display/Hide the boundary in 2D scalar mode. Use Shift+F9/F10 to cycle through the boundary attributes. L - Turn on/off logarithmic scale \ - Set light source position (see Right+Shift)

• • Zoom in / - Zoom out

• • Stretch in z-direction

• • Compress in z-direction [ - Enlarge the bounding box (relative to the colorbar) ] - Shrink the bounding box (relative to the colorbar) ( - Shrink the visualization window ) - Enlarge the visualization window . - Start/stop z-spinning (speed/direction can be controlled with '0'/'Enter')

arrow keys - Manual rotation 1,2,3,4,5,6,7,8,9 - Manual rotation along coordinate axes Ctrl+arrow keys - Translate the viewpoint

Ctrl+o - Toggle an element ordering curve in 2D and 3D

i - Toggle cutting (clipping) plane in 2D y/Y - Rotate cutting plane (theta) in 2D z/Z - Translate cutting plane in 2D

` - Toggle a ruler, with initial origin at the center of the bounding box. The origin can be later moved with '~'. The options are: -> none -> coordinate axes lines -> coordinate axes planes ~ - Enter new ruler origin

k/K - Adjust the transparency level. The balance of transparency can be further adjusted with ',' and '<'.

! - Toggle the use of (1D) texture (smooth interpolation of colors) The options are: -> use discrete texture, the number of colors used depends on the current palette -> use smooth texture (interpolated from current palette)

F3/F4 - Shrink/Zoom each element towards its center, to better visualize the different element shapes F5 - Change the range and number of the level lines F6 - Palette menu (negative repeat number flips the palette) F7 - Change the minimum and maximum values F8 - List of material subdomains to show F9/F10 - Walk through material subdomains F11/F12 - Shrink/Zoom material subdomains (to the centers of the attributes) Shift+F7 - Set the bounding box from the terminal

Advanced mouse functions

Middle+Ctrl - Object translation (moves the camera left/right/up/down) Middle+Ctrl+Shift - Object translation (turns the camera left/right/up/down) Middle+Ctrl+Alt - Moves the camera forward/backward (vertical mouse motion) and tilts the camera left/right (horizontal mouse motion) Right+Ctrl - Object scaling (see also '[' and ']') Left+Alt - Tilt Right+Shift - Change light source position (see '')

Vector data commands

v - Toggle the "vector" state (uses vector subdivision factor, accept u/U) The options are: -> do not show vectors -> show vectors as displacement -> show vector field; vectors are uniformly scaled; the color varies with the magnitude (or the current "vector-to-scalar function", see keys u/U) -> show vector field as above, but the vectors are scaled proportionally to their magnitude V - Change the scaling of the vectors relative to the default

d - Toggle the "displaced mesh" state: (see also keys 'n'/'b') The options are: -> do not show displaced mesh -> show displaced mesh -> assuming displacement field show deformation using Cartesian lines -> assuming displacement field show deformation using polar lines n - increase the displacement amount in 10% steps, wraps around from 100% to 0% b - decrease the displacement amount in 10% steps, wraps around from 0% to 100% B - Display/Hide the boundary in 2D vector mode

e - Toggle the "elements" state (vector data version) The options are: -> show surface elements corresponding to the current "vector-to-scalar function" -> do not show surface elements -> assuming a displacement field show det(J)/det(J_d) -> assuming a displacement field show det(J_d)/det(J)

u/U - Change the "vector-to-scalar function" and the vector subdivision factor U - Toggle the functionality of 'u' (prints a message in the terminal when changed). The options are: -> Increase the vector subdivision factor -> Decrease the vector subdivision factor -> Cycle through "vector-to-scalar functions" choices: -> magnitude: sqrt(vx^2+vy^2) -> direction from -pi to pi: atan2(vy,vx) -> x-component: vx -> y-component: vy -> divergence: div(v) -> curl: curl(v) [skipped for H(div) elements] -> anisotropy in grad(v) [skipped for H(div) elements]

3D data commands

i - Toggle cutting (clipping) plane The options are: -> none -> cut through the elements -> show only elements behind the cutting plane I - Toggle the cutting plane algorithm used when the option "cut through the elements" is selected. The two algorithms are: -> slower, more accurate algorithm for curved meshes (default) -> faster algorithm suitable for meshes with planar faces x/X - Rotate cutting plane (phi) y/Y - Rotate cutting plane (theta) z/Z - Translate cutting plane E - Display/Hide the elements in the cutting plane M - Display/Hide the mesh in the cutting plane

o/O - Refine/de-refine elements

u/U - Move level surface value up/down v/V - Add/Delete a level surface value

w/W - Move boundary elements up/down in direction of the normal (i.e. "plot" the boundary values in normal direction)

F3/F4 - Shrink/Zoom boundary elements (to the centers of the attributes) F8 - List of boundary subdomains to show F9/F10 - Walk through boundary subdomains F11/F12 - Shrink/Zoom material subdomains (to the centers of the attributes)

3D vector data commands

v - Toggle the "vector" state The options are: -> do not show vectors -> show vectors as displacement -> show vector field; vectors are uniformly scaled; the color varies with the magnitude (or the current "vector-to-scalar function", see key F) -> show vector field as above, but the vectors are scaled proportionally to their magnitude -> show the subset of the vector field with scalar function around a given value (adjusted with keys u/U and w/W) -> show the vector field restricted to the boundary of the domain V - Cycle the "vector" state in the opposite direction of 'v'

u/U - Move the level field vectors (in the appropriate "vector" state) w/W - Add/Delete level field vector (in the appropriate "vector" state)

d - Toggle the "displaced mesh" state: (see also keys 'n'/'b') The options are: -> do not show displaced mesh -> show displaced mesh n - increase the displacement amount in 10% steps, wraps around from 100% to 0% b - decrease the displacement amount in 10% steps, wraps around from 0% to 100%

F - Change the "vector-to-scalar function" The options are: -> magnitude: sqrt(vx^2+vy^2+vz^2) -> x-component: vx -> y-component: vy -> z-component: vz