Installation and use
- Put the python file into scripts/addons/ directory
- Press F8 to refresh Blender
- Open the user preferences window add-ons tab
- In the add curve category, turn on the bezier curve offset tool
- In curve edit mode, select a spline(any point in spline) and press W-key-> Bezier curve offset or hotkey Ctrl+R.
- Set the value for distance and steps.