Chimera Commands Index
angle atom1 atom2 atom3
[ atom4 [ dihedral true | false ]]
angle object1 object2
The angle command measures angles:
Any atom specification
that gives the proper number of atoms can be used.
The order of specification is important, but atoms need not be connected.
Objects are specified by ID as shown in the
For angle measurements, axes and planes are treated as infinite.
The angle value in degrees is reported in the
status line and
- formed by three atoms
- formed by four atoms (dihedral angle,
or if dihedral false is specified, the angle between the
atom1-atom2 and atom3-atom4 vectors). The
dihedral keyword can be truncated, and the option is default true.
Synonyms for true: True, T, t, 1. Synonyms for false: False, F, f, 0.
- between two geometric objects (two axes, two planes, or one axis and one
plane) created with define or
Three or four atoms can be
specified collectively using the word selected, sel, or
picked if the current selection
contains only those atoms; the
order in which the atoms were selected
(most likely picked) is used.
When order information is lacking
(for example, the atoms were selected simultaneously),
the angle actually measured may not be the one intended.
The angle command provides a static measurement;
changes are not reported automatically.
Angles formed by atoms can be monitored continuously using the