Visual navigation of large environments using textured clusters

ABSTRACT

A visual navigation system is described which uses texture mapped primitives to represent clusters of objects to maintain high and approximately constant frame rates. In cases where there are more unoccluded primitives inside the viewing frustum than can be drawn in real-time on the workstation, this system ensures that each visible object, or a cluster that includes it, is drawn in each frame. The system supports the use of traditional “level-of-detail” representations for individual objects, and supports the automatic generation of a certain type of level-of-detail for objects and clusters of objects. The concept of choosing a representation from among those associated with an object that accounts for the direction from which the object is viewed is also supported. The level-of-detail concept is extended to the whole model and the entire scene is stored as a hierarchy of levels-of-detail that is traversed top-down to find a good representation for a given viewpoint. This system does not assume that visibility information can be extracted from the model and is thus especially suited for outdoor environments.

REFERENCES

• 1: John M. Airey , John H. Rohlf , Frederick P. Brooks, Jr., Towards image realism with interactive update rates in complex virtual building environments, Proceedings of the 1990 symposium on Interactive 3D graphics, p.41-50, February 1990, Snowbird, Utah, United States
• 2: Kurt Akeley, Reality Engine graphics, Proceedings of the 20th annual conference on Computer graphics and interactive techniques, p.109-116, September 1993 [doi>10.1145/166117.166131]
• 3: Thomas A. Funkhouser , Carlo H. Séquin, Adaptive display algorithm for interactive frame rates during visualization of complex virtual environments, Proceedings of the 20th annual conference on Computer graphics and interactive techniques, p.247-254, September 1993 [doi>10.1145/166117.166149]
• 4: Thomas A. Funkhouser , Carlo H. Séquin , Seth J. Teller, Management of large amounts of data in interactive building walkthroughs, Proceedings of the 1992 symposium on Interactive 3D graphics, p.11-20, June 1992, Cambridge, Massachusetts, United States [doi>10.1145/147156.147158]
• 5: Paulo William Cardoso Maciel, Visual navigation of large environment using textured clusters, Indiana University, Indianapolis, IN, 1995
• 6: John Rohlf , James Helman, IRIS performer: a high performance multiprocessing toolkit for real-time 3D graphics, Proceedings of the 21st annual conference on Computer graphics and interactive techniques, p.381-394, July 1994 [doi>10.1145/192161.192262]
• 7: Harvey R. SchiEman. Sensation and Perception an Integmted .Appmach. John Wiley & Sons, New York, 1990.
• 8: Inc. Silicon Graphics. Gmphics Libmry Programming Guide, Volumes I and II, 1992.
• 9: Inc. Silicon Graphics. React In Iti: A description of real-time capabilities of Iriz 5.3 on Onyz/Chullenge multiprossor systems., 1994.

INDEX TERMS

Primary Classification:
  I. Computing Methodologies
  I.3 COMPUTER GRAPHICS
      I.3.7 Three-Dimensional Graphics and Realism
          Subjects: Virtual reality

Additional Classification:
  G. Mathematics of Computing
  G.2 DISCRETE MATHEMATICS
      G.2.2 Graph Theory
          Subjects: Trees

  I. Computing Methodologies
  I.3 COMPUTER GRAPHICS
      I.3.7 Three-Dimensional Graphics and Realism
          Subjects: Color, shading, shadowing, and texture

General Terms:
Design, Measurement, Performance