FARAFEL -- A noodles input routine for FEL

Usage:

farafel fara.fel -s

This command will bring up an expert shell in standalone mode.
fara.fel is an FEL dictionary of verbs, attributes and values for
loading noodles models.

The FEL model files are in the directory modfels.  The file all.fel in
this directory will generate all the v7 files for the simulator based
on the FEL model files in this directory.  The v7 noodles models will
be written to a subdirectory named v7 below the current directory.

VERBS
 read -- standard FEL read command to read model files
 quit -- standard FEL command to exit program
 save -- modeled on read, this command will save noodles models as v7 files.
 display -- this command uses X windows (or hoops) to draw a wireframe
            representation of the model
 define -- verb to create low level modelling primitives
 combine -- verb to combine primities and/or complex models into
            complex  models

Attributes for SAVE verb
 TYPE -- only legitimate value for the type attribute is FILE
 NAME -- a string, delimited by double quotes, that is the file name
         to store the objects
 OBJECTS -- a list of one or more objects to store.  If multiple
            objects are specified, a noodles DOMAIN is created with
            each object as a member, and the domain is stored to the
            file.  If one object is in the list, no domain is created
            and only the single object is stored in the file.

Attributes for DISPLAY verb
 TYPE -- the only value for the type attribute is COMPLEX
 OBJECTS -- a list of objects to display.  Each object is displayed
            individually.  The 'q' command in the display window
            causes the next object to be rendered

Attributes specific to DEFINE verb
 TYPE CUBE -- a noodles cube model -- attribute SIZE changes dimensions
 TYPE TUBE -- a noodles cyliner model -- attribute SIZE sets X-Y
              dimensions and HEIGHT sets Z dimension.  DIVISIONS sets 
              the number of faces in the tube
 TYPE SPHERE -- a noodles sphere model -- attibute SIZE changes the
              XYZ dimensions.  DIVISIONS sets the number of faces.
 TYPE COMPLEX -- only COPY is allowed to be specified
 TYPE EXTRUSION -- the VERTICES attribute specifies a list of X-Y
                pairs (each as a list) and HEIGHT specifies the amount
                to extrude.
 COPY symbol -- symbol is the name of model already defined.  A copy
             of this model is produced (if persistent) and returned
             (the model is returned without copying if not persistent)

Attributes specific to COMBINE verb
 TYPE -- UNION, INTERSECTION, DIFFERENCE -- set opereations for models
 OBJECTS -- a list of operands for the operation.  At least two
         operands must be specified

Attributes shared by both DEFINE and COMBINE verbs
 NAME symbol -- value symbol is not quoted.  Every model and
             intermediate model must be named.  These names are used
             to reference the model by the OBJECTS and COPY attributes
             described above 
 MOVE -- a list of doubles for (X Y Z) values to displace the model
 ROTATE -- a list of doubles for (Z Y X) rotations of the model about
           the origin
 SCALE -- its value is a single double to proportionally change the
          size of the model
 SOLID -- A value of TRUE computes the solid portion of the current
          model and disgards extra stuff
 PERSISTENT -- models that are persistent may be referenced by COPY or
           OBJECTS many times.  Models that are not persistent may be
           accessed only once.  Values for persistent are TRUE or
           FALSE.