Polyray
  
 
  This page uses the technique of ray tracing (via
  Povray) to plot algebraic surfaces,
  i.e., surfaces defined by implicit algebraic equations.
  This technique gives excellent results, but requires a relatively
  important amount of time for the computation. You are therefore asked to
  be patient, and not to ask for plots of too high quality (size and
  fluidity of animation).
        The most recent version
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  Please take note that WIMS pages are interactively generated; they are not ordinary
  HTML files. They must be used interactively ONLINE. It is useless
  for you to gather them through a robot program.
  
    - Description: visualize implicit algebraic surfaces by ray tracing. interactive exercises, online calculators and plotters, mathematical recreation and games
 
    - Keywords: interactive mathematics, interactive math, server side interactivity, geometry, algebra, algebraic_geometry, surfaces,graphing,equations