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Behavioral Animation

Behavioral Animation Procedural Animation Type? Behavioral Animation Introduced by C. Reynolds (1987) Animating many things at one time A group of the same species (flock of birds, school of FISH ) “boids” Instead of animating individually, specify rules Behavioral Animation

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Behavioral Animation

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  1. Behavioral Animation Procedural Animation Type?

  2. Behavioral Animation • Introduced by C. Reynolds (1987) • Animating many things at one time • A group of the same species (flock of birds, school of FISH) • “boids” Instead of animating individually, specify rules

  3. Behavioral Animation Two main forces control group: • Collision avoidance- each member must avoid collision with other members and the environment • Tendency toward group centering (staying together) • Implies knowing about other members • Localized, not global so that flock splitting can occur

  4. Additional Forces • Velocity matching of neighboring boids (like merging on a freeway) • Attraction/repulsion (like bees attracted to sweets) • Behaviors • Migration • follow-the leader (leader has pre-scripted path) • Predator-prey(two species or additional actor)

  5. Resultant • To determine resultant vector, don’t use averaging. • Instead, use priority allocation based on finite (normalized) resource A boid is moving through a force field. Assume that the boid’s trajectory is determined 75% from current trajectory and 25% from external forces. If the current trajectory is (1,1,1) and the external force is (0,2,0), what is the next trajectory after one time step?

  6. Perception • Boid aware of itself and 2-3 neighbors • See what’s ahead of it within limited field of view • Distance visible in front is limited • Influenced by objects (obstacles, force fields) based on distance & size

  7. Next Step • Massive/crowd animation

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