## Edit menu

The edit menu provides access to several display properties settings etc.

##### Contents:

- Colormap Editor
- Grouping
- Material Editor
- Background Color Editor
- Timestep Control
- Math Module Window
- Stop Processing
- Camera Settings
- Object Clip Planes

#### Colormap Editing

Colormap editor lets you read predifned colormaps or define and save your own colormap. Colormap is used by all the data displaying functions in elmerpost to map scalar values to colors in display window.

Colormap editor is launched by selecting the menu item Colormap from the Edit menu at the main window.

When started the colormap editor gives an picture of the current colormap in a window. The colormap indexes run from the top-left corner to right and down.

A number of knot points are shown with circles inside the color boxes. You can change a color of a box with a knot by clicking the box with left mouse button when pointer is inside the box and using the slider at the bottom of the window. The current knot is shown with green circle whereas the other knots are red. You can also add a knot to any of the boxes by clicking a box with the middle mouse button. You can move a knot around using left mouse button to click to a knot and dragging. When the pointer is above a knot you can delete the knot by pressing Shift key and middle mouse button simultaneously.

You can view the edited colormap without closing the editor by pressing the Apply button.

##### Colormap file format

In addition to editing colormap interactively colormap can be given from a definition file.

An example of a colormap file is given below:

    !
    !
    ! Default colormap
    !
    ! code   index   red  green  blue
    !
      knot      0     0     0     100  ! start from blue
      knot     42     0    100    100  ! to cyan
      knot     85     0    100     0   ! to green
      knot    128    100   100     0   ! to yellow
      knot    170    100    0      0   ! to red
      knot    213    100    0     100  ! to magenta
      knot    255    100   100    100  ! to white

The file is composed of rows beginning with the keyword knot followed by an index to the colormap followed by red, green and blue values of an colormap entry with this index. The size of the colormap is given by the largest index to the colormap. The red, green and blue values are given in percentage values from 0 to 100.

#### Grouping

Grouping of elements is given in the element model file. Currently the only functional use of the grouping information is to restrict the display of elements to selected groups. This can be accomplished using the window given by the menu choice Edit => Grouping shown below.

A known problem with the display of groups is that it doesn't apply to the line mode mesh display.

#### MaterialEditor

Material editor lets you change the surface color settings. It has two modes: Ambient & Diffuse and Specular. In both modes you can use the color sliders to adjust the color of the diffuse reflection and specular reflection respectively. The shininess slider is used to give value of the specular exponent and thus applies only to specular reflection. Lowering the value of the specular exponent increases the angle with which the specular reflection spot can be seen to eye and vice versa.

In the leftmost picture only diffuse reflection is used (the specular color is black). In the middle picture the specular color is allmost white and the value of the shininess setting is 20. In the rightmost picture the shininess is 5.

#### Background Color Editor

The menu entry Edit => Background Color is used to set the color of graphics window background. Use the red, green, and blue sliders to set the color or pick one of the predifined colors in the list box at the bottom of the window.

#### Controlling Timesteps

The menu entry Edit => Timestep Control launches a panel that allows one to interactively view the timestep range read in from the model file.

At the top of the window is shown the current timestep as a number and a slider value. Both can be changed at will.

Below are the settings for looping over specified range of timesteps. You can set the minimum and maximum timestep to be looped over, the increment of the timestep in between and also the number of times the loop is to be executed.

At the second line you can give any Elmerpost command which will be executed after each update of display has been done. This option can be used for example to save the current picture in a file. You can refer to current timestep as variable named "t". The loop will be executed when you press the Loop button and can be stopped prematurely by pressing the same button again.

#### The Math Module

The menu entry Edit => Math Module Window launcehes a text window with direct access to the Elmerpost MATC- matrix language. Refer to MATC-documentation.

At the bottom of the created window there is a command line input window where you can give any MATC-command. The results, if any, are shown in the text window immediately above, and a list of previous commands given at the topmost window.

#### Stop Processing

Edit => Stop Processing tries to stop Elmerpost from doing whatever it is doing. This of cause requires that user interface loop is active at the time (otherwise you won't be able to select this item), refer to TCL/TK documentation.

#### Camera Configurations

The menu entry Edit => Load Camera Configurations lets you define camera (viewing) settings. There are several parameters to consider. First of all there are the parameters related to viewer: the point in space where the viewer is located (From x,From y,From z), the point in space where the view is focused (To x,To y,To z) and the 'up' direction of for the viewer (Up x,Up y, Up z). Projection type of the camera, either perspective or orthogonal procjection can be selected. The parameter called 'View Angle' acts like a zoom in a real camera: increasing the value gives a wider view and also 'zooms out' the model. The range of view in direcetion of the view can be set from the 'Near Clip' and 'Far Clip' settings. Finally one can set the viewport i.e. the part of the graphics window which is used for rendering this cameras view.

One can also read camera configurations from a file, an example of such a file is given below defining three cameras on the scene. The cameras are located at different angles with regard to the model and divide the drawing area between themselves.

    !
    ! camera configuration three view
    !
    !
    camera      camera1
    from        0 0 5
    to          0 0 0
    up          0 1 0
    viewport    0 0 0.5 1.0
    projection  perspective
    field angle 30
    clip        0.1 20         ! near far

    camera      camera2
    from        5 0 0
    to          0 0 0
    up          0 1 0
    viewport    0.5 0 1 0.5
    projection  perspective
    field angle 30
    clip        0.1 20         ! near far

    camera      camera3
    from        3 3 3
    to          0 0 0
    up          0 1 0
    viewport    0.5 0.5 1 1
    projection  perspective
    field angle 30
    clip        0.1 20         ! near far

#### Object Clip Planes

In addition to viewing clipping planes (see the Camera Settings previously), which are always aligned with viewing coordinate planes, you can interactively set six additional clipping planes in model coordinate space. The coordinates for the plane settings are scaled so that the largest coordinate direction for the model is scaled to range from minus one to plus one.