t,translation for translational motions
r,rotation for rotational motions
s,scale for scaling motions
-<axis> can be either of x,y,z for the respective axes
+<axis> can be either of x,y,z for the respective axes. Negative axes can
+ be specified by prepending a '-' to the axis name.
<unit> (optional) can be r,rad, or radian to specify that the columns
should be interpreted as radians instead of the default degrees.
+For a single frame all column specifications must be consecutive in the
See sampleanimation.txt for an example.