q = getQuaternionParameter(i);
}
i = iToken + 1;
if (q == null)
error(ERROR_invalidArgument);
AxisAngle4f aa = q.toAxisAngle4f();
axis.set(aa.x, aa.y, aa.z);
/*
* The quaternion angle for an atom represents the angle by which the
* reference frame must be rotated to match the frame defined for the
* residue.