SeGaCH Workshop, VAST 2008


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SeGaCH Workshop, VAST 2008

  1. 1. An algorithm to show monuments in virtual words for cultural heritage ELIOS Lab Riccardo Berta ELIOS Lab, DIBE, University of Genoa [email_address]
  2. 2. Presentation Outline <ul><li>Research context: Travel in Europe project </li></ul><ul><li>Trade-off: photorealism vs model simplicity </li></ul><ul><li>Solutions: a architectonic-style Likelihood principle </li></ul><ul><li>Monument problem: very complex shapes </li></ul><ul><li>Standard billboard technique </li></ul><ul><li>Dynamic billboard applied to monuments </li></ul><ul><li>Example </li></ul><ul><li>Conclusions </li></ul>
  3. 3. Travel in Europe (TiE) project <ul><li>Travel in Europe (TiE): European project co-funded by Culture 2000 programme </li></ul><ul><li>Implement an innovative mean to promote and divulgate the European heritage </li></ul><ul><ul><li>The main target audience: high-school students aged 14 to 18 </li></ul></ul><ul><li>An easy-to-access online environment </li></ul><ul><ul><li>Users will live challenging and compelling game experiences by interacting with virtual representations of European heritage </li></ul></ul><ul><li>The project exploits the concept of travel </li></ul><ul><ul><li>Engaging by itself </li></ul></ul><ul><ul><li>Supports geographic contextualization </li></ul></ul>
  4. 4. TiE Vision <ul><li>A player of TiE moves in a 2D space representing the map of Europe </li></ul><ul><li>The player visits some cities and regions that are reconstructed in 3D </li></ul><ul><li>He faces 2D trials (microGames: mGs) embedded in the 3D reconstructions to obtain scores </li></ul><ul><ul><li>mGs will concern the local artistic heritage and will be contextualized </li></ul></ul><ul><ul><ul><li>E.g. an art game concerning the Van Cleve’s “Adoration of the Magi” picture will be played in the 3D reconstruction of the San Donato church in Genoa’s historical center, where the picture is conserved </li></ul></ul></ul>
  5. 5. 2D Europe Map
  6. 6. 3D world
  7. 7. Trade-off <ul><li>Trade-off </li></ul><ul><ul><li>Photorealism </li></ul></ul><ul><ul><ul><li>Highly impressive </li></ul></ul></ul><ul><ul><ul><li>Culturally correct and meaningful experience </li></ul></ul></ul><ul><ul><ul><ul><li>The player as a sort of art/history detective </li></ul></ul></ul></ul><ul><ul><li>Models’ weight and complexity </li></ul></ul><ul><ul><ul><li>Allow interactive real-time online exploration </li></ul></ul></ul>
  8. 8. POIs and RBAs <ul><li>Point of Interests (PoI) </li></ul><ul><ul><li>High-detail, rigorous reconstructions of a building </li></ul></ul><ul><ul><ul><li>Cathedral, theather, Renaissance palace </li></ul></ul></ul><ul><li>Random Building Areas (RBA) </li></ul><ul><ul><li>Dynamically built using a statistical template-based algorithm </li></ul></ul><ul><ul><ul><li>Exploit a statistical description of the architectonic parameters </li></ul></ul></ul><ul><ul><ul><li>Use a limited set of textures that are instances of architectonic features representative of that area (e.g windows, portals, etc.) </li></ul></ul></ul>
  9. 9. POIs
  10. 10. RBAs
  11. 11. Likelihood principle <ul><li>Architectonic-style likelihood principle </li></ul><ul><ul><li>Allows users to live experiences similar to a real visit of a city limiting the effort in 3D modeling: </li></ul></ul><ul><ul><ul><li>Like in a real visit: a visitor perceives the feeling of being in a precise place but usually does not perceive/remember the particulars of each distinct building </li></ul></ul></ul>
  12. 12. Monuments <ul><li>A major problems: monuments </li></ul><ul><ul><li>Very complex modeling task </li></ul></ul><ul><ul><li>Very important to realize a virtual model of a city </li></ul></ul>
  13. 13. Billboard (or “sprite”) videogame technique <ul><li>A 2D image integrated into a 3D scene </li></ul><ul><li>This 2D image always faces the viewer </li></ul><ul><ul><li>In other words: the billboard plane is always perpendicular to the view direction from the camera. </li></ul></ul><ul><li>Billboarding is used to create an illusion </li></ul><ul><ul><li>Although it is 2D, it often represents a 3D object. </li></ul></ul><ul><ul><ul><li>Example: tree, foliage,etc.. </li></ul></ul></ul>
  14. 14. Billboard videogame technique <ul><li>Used for: </li></ul><ul><ul><li>“ foliage replicator” </li></ul></ul><ul><ul><li>Trees </li></ul></ul><ul><ul><li>... </li></ul></ul><ul><ul><li>Example: Torque Game Engine Demo </li></ul></ul>
  15. 15. Dynamic Billboard for Monuments <ul><li>A modified billboard algorithm: </li></ul><ul><ul><li>the billboard for monument is composed of several textures that are displayed at different viewing angles </li></ul></ul><ul><ul><li>This allows to see the monument from multiple angles, instead of it always looking the same, no matter from what angle you viewed it </li></ul></ul>
  16. 16. Dynamic Billboard for Monuments <ul><li>Content collection: </li></ul><ul><ul><li>You can imagine the monument as if it were surrounded by a sphere, and the digital camera placed in N positions in the sphere equator </li></ul></ul><ul><ul><li>The camera lenses are directed towards the center of the sphere </li></ul></ul><ul><ul><li>It is necessary to provide for each monument N pictures taken with the camera’s line of sight perpendicular to the monuments and spaced equally on the equator line </li></ul></ul>
  17. 17. Dynamic Billboard for Monuments
  18. 18. Dynamic Billboard for Monuments
  19. 19. Dynamic Billboard for Monuments <ul><li>Example from TiE prototype </li></ul>
  20. 20. Conclusions and Future Works <ul><li>Project started in Nov 2006 </li></ul><ul><li>User needs analysis performed </li></ul><ul><ul><li>Students, teachers, art experts from 8 countries </li></ul></ul><ul><li>Design deliverable </li></ul><ul><ul><li>Game engine, cultural environment mechanisms, MMORG architecture, trial games </li></ul></ul><ul><li>Content Collection (semi-automatic) </li></ul><ul><ul><li>Rules for 3 rd parties to provide maps and pictures from the cities to be implemented </li></ul></ul><ul><ul><li>Contents for the trial-games </li></ul></ul><ul><li>Implementation has started, and we have a demo that include some cities </li></ul>