# Selecting Units of Measure

As you work on your scene objects, you can change their position or how they appear in your scene. To be able to measure the changes in size, rotation, or position, you need to use a system of measurement to make accurate modifications.

To select the measurement unit you want to use in your Toon Boom Studio session:

1. Open the Preferences dialog box. Select Toon Boom Studio > Preferences.

The Preferences dialog box opens.

2. Select the Sceneplanning tab.

3. Select the unit of measure from the Coordinate Units drop-list. You have the following choices:

- centimeters
- inches
- fields: the traditional animation industry standard for the size of a film camera (0.5" X 0.375" at a ratio of 4:3).

By default,Toon Boom Studio uses the traditional field system (measured by North/South/East/West) to measure the distance, position, and size of your elements.

4. Choose from your other Sceneplanning options:

- Select the Show Units option to turn on or off the display of unit values in Sceneplanning fields.
- Select the Use Box Highlighting option to display selections in a bounding box. When disabled, selected elements appear faded.
- Select the Create Linear Spline option to force all new peg functions (motion, rotation and scaling) you create to have no acceleration. New peg functions will have a linear velocity instead. When you de-select this option, motion paths are created with a default ease-in/ease-out velocity.
- Select the Create Constant Keyframes option to force all new keyframes with constant rather than tweened (interpolated) segments.
- Select the Single Cell Selection option to select a single cell when you click on a layer track in the Timeline View, instead of an entire track.

5. Click OK when done or select another tab.

See Also
Basic Sceneplanning Concepts
Setting up Your Studio Session