> Why I can not write this:
> ======================================
> rotate <xvibrate, 0, 0>?
> ======================================
> It gives me an error.

the cosd function requires that transforms.inc has been included into the
script
the other way is to use not worrying about transforms.inc
cos(clock*2*pi*[rest_of_function]) instead of
cosd(clock*360*[rest_of_function])

#include "transforms.inc"
> > #declare damping = 5;
> > #declare frequency = 5;
> > #declare framerate = 25;
> > #declare frames = 100
> >
#declare xvibrate = [distance or rotation
angle]*cosd(clock*360*(frames/framerate)*frequency)*pow(2.817,-clock*(frames/framerate)*damping);

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