Released under the GNU LESSER GENERAL PUBLIC LICENSE.
Download (Windows users, right click and "Save As")
This script is freely distributable
AC3D versions prior to version 5 have not been tested with this script.

Crease is an AC3D script that allows you to set the crease on multiple objects at once. Without this plugin, the user must set the crease angle on each object individually.
Copy the crease.tcl file to your AC3D scripts folder (for example, if using Windows, C:\Program Files\AC3D5\scripts) and (re)start AC3D.
You will find the "Set crease..." menu item under the "Tools" menu.
Select the items for which you would like to set the Crease value. Enter the crease value you'd like to set in the edit box and click "Set crease angle".