//MPRender-rexx/SETATTR

SETATTR :


   NAME   
  SETATTR -- Sets the attributes of a variable etc.

   SYNOPSIS
  SETATTR( BASEADDRESS/A,NAME/A,VALUE/A )

   FUNCTION
  Sets the current value of a specified field.

   INPUTS
  BASEADDRESS - As returned by - parse arg Base -.
  NAME        - Name of variable to set attributes for:
                Movement - 0 to 1024 - the proportion of movement
                              from the first image to the second image;
                Red1     - 0 to 1024 the proportion of image 1 Red to use;
                Green1   - As Red1 for Green;
                Blue1    - As Red1 for Blue;
                Red2     - 0 to 1024 the proportion of image 2 Red to use;
                Green2   - As Red2 for Green;
                Blue2    - As Red2 for Blue;
                Produce  - 1 to render the frame - 0 to skip;
                RPlus    - 0 to 255 to add to Red in rendered image;
                GPlus    - As RPlus for Green;
                BPlus    - As RPlus for Blue;
                RMinus   - 0 to 255 to subtract from Red in rendered image;
                GMinus   - As RMinus for Green;
                BMinus   - As RMinus for Blue;
                DX       - 0 to ? - X amount to skip;
                DY       - 0 to ? - Y amount to skip.
  VALUE       - Value to use.

   RESULT
  Returns error 10 if invalid NAME.

   EXAMPLE
  parse arg Base;SetAttr Base RMinus 12

   NOTES
  Should only be called from PRESCRIPT scripts.
  It is a good idea to call - Numeric digits 12 - for correct processing
  of BASEADDRESS.

   BUGS
  Allows setting of read only variables (i.e. those listed in GETATTR()
  which are not listed here). Does not validate that a valid BASADDRESS
  is passed.

   SEE ALSO
  GETATTR().