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(transform-incr objectID centerID frameID [rotate|translate|translate-scaled|scale] x y z [origin|bbox-center] [dt [smooth]])dt argument is present,
the objeto is moved at each time step such that its average movimento
equals one instance of the movimento per dt seconds.  E.g. 
  (transform-incr  World World World  rotate  6.28318 0 0  10.0)
rotates the World about its X axis at 1 turn (2pi radians) per 10 seconds.