FDE is FACSGen's file format for storing dynamic expressions. "FDE" stands for FACSgen Dynamic Expression.

A FDE file only stores the information representing an animation (animation curves, control points, duration, etc...).

Here are a few reasons why you'd like to save a .fde file:

• Simply to save your work, and keep it for later editing.
• In order to create video files in batch, you'll need to prepare a folder containing multiple animation files.
• To edit the content of an animation using its xml representation, rather than manually editing the curve with the gui.

A FDE file is actually a simple XML file, which can easily be read and written by humans and machines.

Editing FDE files (or creating them from scratch) can be useful in many situations. For example:

• When you need to set the intensity of a control point to a precise value that you'd like to type in manually.
• When you want to automatically create a large number of animation files:
  Pick your favorite programming language, and write a script that creates/edits the FDE files you need in a procedural manner.

In order to save a video or an image sequence of an animation, please refer to the Batch Video Export section.