5.7 Add fragments OpenGL

In order to complete the basic 3D molecular editor add, remove and change atom functions, the capability to add entire new fragments was added to VEGA. It's based on the powerful integrated database engine that allows the use of standard fragment libraries and the creation of personalized too. These features increment the user productivity due to fast molecule building.
Selecting the Edit -> Add -> Fragments menu item the following wizard is showed:

Select database and fragment

As first step, you must select the Group library and the Fragment. The library is automatically opened clicking on the group name. 

Click Next

When you click on the fragment name, its 3D structure is showed in the main window. Press the Next button to continue.

Pick a fragment hydrogen

Now you must click a fragment hydrogen in the main window that will be merged with another molecule hydrogen in order to build the bond. Press Next to continue.

Selecting the molecule hydrogen and the Next button the bond will be completed.

Set the torsion

At the end, you can adjust the torsion angle between the molecule and the fragment clicking the torsion buttons. Click the Finish to place definitively the fragment. Now the tool is ready to bind another fragment to the molecule.
Please remember that when the workspace is empty (no molecule loaded), the first wizard step is operative only and the Previous button, when active, allows to go to the previous wizard step.

The fragment libraries are simple zip files placed in the Data/Fragments folder and created by the Database Explorer. You can use this tool to change/expand the standard database. The preferred molecule file format to use in these libraries is the IFF, because it can contain the best number of information.