       TSIPP  (TSIPP)  is  a 3D image specification and rendering
       toolkit for use with Tcl and Tk.  It provides a  Tcl  com-
       mand  interface  to  SIPP,  the  SImple  Polygon Processor
       library.  This provides a command interface  for  creating
       3-dimensional  scenes  and rendering them using a scanline
       z-buffer algorithm.  The Tcl interpretive programming lan-
       guage  is used to provide a powerful, yet simple interface
       to this library.  The scene may be written to either a PPM
       format  file,  as  defined by the PBMPlus toolkit or a RLE
       file, as defined by the Utah Raster Toolkit.

       An interface to render to a Tk photo image  is  also  pro-
       vided.  Events such as button presses may take place while
       rendering is in progress.
