anchor.diff:  parameters, as shown in the
   <<effects#spatial-effects,effect examples>>.
   
  -== Digging Deeper
  +=== Digging Deeper
   
   For more details, see the
   http://deepsymmetry.org/afterglow/doc/afterglow.effects.params.html[API
   documentation].
   
  -#### License
  +==== License
   
   +++<a href="http://deepsymmetry.org"><img src="assets/DS-logo-bw-200-padded-left.png" align="right" alt="Deep Symmetry logo"></a>+++
   Copyright © 2015 http://deepsymmetry.org[Deep Symmetry, LLC]
  
positive.code: parameters and get lovely shifting rainbow cues, as shown in the
  <<effects#oscillator-effects,effect examples>>.
  
  == Direction Parameters
  
  Direction parameters are one way to tell a group of fixtures to point
  in a particular direction, or move in unison or in a coordinated
  pattern. They are used with <<effects#direction-effects,Direction
  Effects>>. (<<parameters#pan-tilt-parameters,Pan Tilt Parameters>> are
  the other way to work with this kind of effect.) The basic way to
  
negative.code: the show variable was stored) or <<oscillated-parameters,oscillated
  parameters>>.
  
  === Pan Tilt Parameters
  
  A more traditional way of aiming fixtures (in contrast to
  <<parameters#direction-parameters,Direction Parameters>>) involves
  