       Errors  in  TSIPP  are  handled via the standard Tcl error
       mechanism.  This allows the programmer to trap errors with
       catch  or  receive  a procedure stack tracing of where the
       error occurred.  Often a error is  caused  by  an  invalid
       specification  of  an  object or surface. These errors are
       generally not caught until  rendering,  manifesting  them-
       selves  as  a  floating point exception or a math function
       domain errors.  Probably the best  solution  when  one  of
       these errors occurs is to remove objects from the scene or
       surfaces from objects until the error disappears.
