Basic HTML version of Foils prepared 23 February 97

Foil 8 Describing Terrain in VRML

From Terrain Rendering and GIS using Java and VRML Rome Lab Quarterly Review for CIV -- June 28 96. by Paul Coddington, Alvin Leung, Krysztof Walczak, Byeongsoeb Ki *
Terrain is represented in VRML as polygons (constructed using digital elevation data) with vertex coloring or a texture map for displaying terrain features (obtained from satellite images, maps, or simulation results)
To obtain real-time animation, have reduced the number of polygons to be rendered by using
  • polygon optimization, to approximate the terrain using a smaller number of texture mapped polygons
  • level of detail, to use lower resolution data for regions further from the viewer

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