### 4.2.2. Common Options

The Common options are:

Auto Save

  Select the time between automatic saves.

  To turn off automatic saves, set Auto Save to `Never`.

  Note: This option affects more than one CFX product.

Temporary directory

  To set a temporary directory, click Browse to find a convenient directory where the autosave feature will save state files.

The following sections describe the options under Common:

- Appearance
- Viewer Setup
- Units

#### 4.2.2.1. Appearance

The appearance of the user interface can be controlled from the Appearance options. The default user interface style will be set to that of your machine. For example, on Windows, the user interface has a Windows look to it. If, for example, a Motif appearance to the user interface is preferred, select to use this instead of the Windows style.

1. Under GUI Style, select the user interface style to use.

2. For Font and Formatted Font, specify the fonts to use in the application.

   Note: It is important not to set the font size too high (over 24 pt. is not recommended) or the dialog boxes may become difficult to read. Setting the font size too small may cause some portions of the text to not be visible on monitors set at low resolutions. It is also important not to set the font to a family such as Webdings, Wingdings, Symbols, or similar type faces, or the dialog boxes become illegible.

#### 4.2.2.2. Viewer Setup

1. If you have complicated simulations that feature many overlapping lines, you can specify a Picking Tolerance that will increase the resolution for picking operations. Values must be between 1 (low resolution) and 0 (very high resolution); the default value is 0.1. Note that increasing the resolution will slow printing times.

2. Select Double Buffering to use two color buffers for improved visualization.

   Double Buffering is a feature supported by most OpenGL implementations. It provides two complete color buffers that swap between each other to animate graphics smoothly. If your implementation of OpenGL does not support double buffering, you can clear this check box.

3. Select or clear Unlimited Zoom.

   By default, zoom is restricted to prevent graphics problems related to depth sorting. Selecting Unlimited Zoom allows an unrestricted zoom.

##### 4.2.2.2.1. Mouse Mapping

The mouse-mapping options enable you to assign viewer actions to mouse clicks and keyboard/mouse combinations. These options are available when running in stand-alone mode. To adjust or view the mouse mapping options, select Edit > Options, then Common > Viewer Setup > Mouse Mapping. For details, see Mouse Button Mapping.

#### 4.2.2.3. Units

1. Under System, select the unit system to use. Unit systems are sets of quantity types for mass, length, time, and so on.

   The options under System include `SI`, `CGS`, `English Engineering`, `British Technical`, `US Customary`, `US Engineering`, or `Custom`. Only `Custom` enables you to redefine a quantity type (for example, to use inches for the dimensions in a file that otherwise used SI units).

   The most common quantity types appear in the main Options dialog box; to see all quantity types, click More Units.

2. Select or clear Always convert units to Preferred Units.

   If Always convert units to Preferred Units is selected, the units of entered quantities are immediately converted to those set in this dialog box.

   For example, if you have set Velocity to `[m s^-1]` in this dialog box to make that the preferred velocity unit, and elsewhere you enter `20 [mile hr^-1]` for a velocity quantity, the entered value is immediately converted and displayed as `8.94078 [m s^-1]`.

The two sets of units are:

- The units presented on this dialog box, which control the default units presented in the user interface as well as the units used for mesh transformation.

- The solution units. For details, see Setting the Solution Units.

##### 4.2.2.3.1. Additional Help on Units

For additional information about units, see Mesh Units.

Release 18.2 - © ANSYS, Inc. All rights reserved.