# Atom Modify

- Element
- Property
- Analysis
- Position
- View
- Length
- Angle

Change here Length properties between atoms and other objects.

### Property

The supported Length properties, the same as for Atom->Measure, are listed below. Atoms and other objects may belong to different parents and may be bonded or not. Only objects in the current layer can be chosen.

An easy technique to select the objects is to click the mouse sucessively over their visual representations, in the sequence shown in the dialog.

2-Atom Distance

The distance between Atom1 and Atom2.

Atom 2-Atom Distance

The distance between Atom1 and the direction defined by Atom2-Atom3.

Atom 3-Atom Distance

The distance between Atom1 and the plane defined by Atom2-Atom3-Atom4.

Atom Direction Distance

The distance between an Atom and a Direction.

Atom Plane Distance

The distance between an Atom and a Plane.

### Value

After selecting the property and the objects, set Value to the desired length and press Ok to activate the change. An error is shown when some of the objects are not recognized, or when the changing direction cannot be determined.

For all properties, of all the objects selected by users only the first atom is actually translated. Atoms bonded to the first atom are also translated, as long as they are not bonded by cyclic structures to any of the other selected objects (without this restriction, all atoms in a ring would be translated!).

For all properties, the direction between the first atom and the other objects is always preserved. Value can take negative values, in which case the first atom and the other modified atoms are reflected to the other side of the reference objects.

When a calculation ends, GAMGI keeps the objects identification. To start a new calculation, just click the mouse over a new object: GAMGI automatically cleans the previous data and inserts the new object identification. When a new property or page is chosen, previous data is automatically removed.
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