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    • Levels of detail for crowds and groups 

      CASSELL, JUSTINE; VILHJALMSSON, HANNES; DINGLIANA, JOHN; MACNAMEE, BRIAN; PETERS, CHRISTOPHER; GIANG, THANH; DOBBYN, SIMON; O'SULLIVAN, CAROL ANN (Blackwell, 2002)
      Work on levels of detail for human simulation has occurred mainly on a geometrical level, either by reducing the numbers of polygons representing a virtual human, or replacing them with a two-dimensional imposter. ...
    • Real-time Collision Detection and Response using Sphere-trees 

      O'SULLIVAN, CAROL; DINGLIANA, JOHN (1999)
      In this paper we address the problem of collision detection and response in real-time animation systems. We describe an approach, which approximates objects using sphere-trees, and uses an interruptible detection algorithm ...