SIGGRAPH 97 Visual Proceedings CD Rom
             Supplementary Material for Technical Sketch
          "Intelligent Transmission of 3D Polygonal Models"
          -------------------------------------------------   

                         Peter J. C. Brown

                        Computer Laboratory
                      University of Cambridge
                            Pembroke St
                             Cambridge
                              CB2 3QG
                                UK
                           pjcb2@cam.ac.uk


Descriptions of the supplementary files:

 - readme.txt (text), readme.unx, readme.mac 
     This file. 

 - Two parts of the image associated with the technical sketch: 
     cessna1.gif (GIF) 
         The view of the original Cessna VRML model. 
     cessna2.gif (GIF) 
         The view of the selectively refined version of the Cessna. 

 - Text and figures of the Technical Report referenced in the
   sketch. This TR details our selective refinement construction and 
   geomorphing algorithms applied to terrain modelling. 
     trtext.pdf (PDF) 
         Text of the Technical Report. 
     trfigs.pdf (PDF) 
         2 pages of figures associated with the Technical Report. 

 - Two animations which are alternative views of one traversal over a 
   mesh which represents the Mt St Helens terrain dataset and which is
   selectively refined according the the current viewpoint. The 
   animations demonstrate the unobtrusive way in which geomorphs can 
   introduce (and remove) detail from an animated scene. 
     anim1.mov (Quicktime) 
         The traversal into the crater from its intended viewpoint. 
         Continual alterations to the RCF force the resolution of the 
         viewed area to be increased (by geomorphing) as the viewer
         nears the crater. 
     anim2.mov (Quicktime) 
         The same traversal as a plan view of the selectively-refined 
         mesh with the visible geomorphs highlighted. Note that when a
         refining or coarsening which lies outside the current view 
         frustum is required, it is performed without any geomorphing.