The molecule can rotate around “external” axes, fixed to viewport, or
around “internal” axes, attached to the molecule. The default rotation
center is the geometric center of the molecule's boundbox.
*rotate* and *spin* commands use the same syntax.
a) Common
*spin on* starts spinning as specified by the previous spin or set spin
commands.
*spin off* stops spinning
Defaults: rotate +10 degrees, spin at +10 degrees per second, external Y
axis.
b) Rotation around an external XYZ axis
*rotate *X, Y or Z* *angle
*spin *X, Y or Z speed
*set spin *X, Y or Z speed (for compatibility with Jmol v.10 and
Rasmol/Chime; requires spin on to start spinning).
**
really what it is is:
rotate [molecular] [some_axis] angle
spin [molecular] [some_axis] speed
where [molecular] is the optional keyword MOLECULAR
and [some_axis] is one of:
a) x, y, z, -x, -y, -z,
b) axisangle {x y z}
c) $xxx where xxx is a drawn line or plane
(in the case of a plane, the rotation is around a normal through the
geometric center)
d) [point] [point]
where [point] is anything that defines a point in space, including:
{x y z} molecular coordinates
{a/b c/d e/f} fractional coordinates
$xxx where xxx is a drawn object such as a point, line, or plane
{atom expression} geometric center of a set of atoms
In the case of (c) and (d), MOLECULAR is implied.
I think that's all there is to it.
**
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