Reactive pedestrian path following from examples

To present an accurate and compelling view of a new environment, architectural and urban planning applications both require animations of people. Ideally, these animations would be easy for a non-programmer to construct, just as buildings and streets can be modeled by an architect or artist using commercial modeling software. In this paper we explore an approach for generating reactive path following based on the user's examples of the desired behavior. The examples are used to build a model of the desired reactive behavior. The model is combined with reactive control methods to produce natural 2D pedestrian trajectories. The system then automatically generates 3D pedestrian locomotion using motion capture resequencing algorithms. We discuss the accuracy of the model of pedestrian motion and show that simple direction primitives can be recorded and used to build natural, reactive, path-following behaviors.