       Tcl-SIPP (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 the photo widget in the  Tk  X11
       toolkit  is  also provided.  Events such as button presses
       may take place while rendering is in progress.
