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Prey Behavior through Influence Maps

Prey Behavior through Influence Maps. Alicia Yeargin CS380, Fall 2011. The Idea. How the idea came together… Big Cat Diary + Old, Useless Prototype = Idea. Behavior of Prey Animals. What does a herd of prey do?. Behavior of Prey Animals.

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Prey Behavior through Influence Maps

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  1. Prey BehaviorthroughInfluence Maps Alicia Yeargin CS380, Fall 2011

  2. The Idea • How the idea came together… • Big Cat Diary + Old, Useless Prototype = Idea.

  3. Behavior of Prey Animals • What does a herd of prey do?

  4. Behavior of Prey Animals • What does a herd of prey do? (According to Video Games) • Research into the subject showed that animal AI more often than not consisted of random wandering behaviors. I dunno, lol. Hey, where ya’ going?

  5. Behavior of Prey Animals • What does a herd of prey do? (Really.) Credit: Wildebeest herd, Flicker, h_savill http://www.flickr.com/photos/h_savill/209372013/

  6. Behavior of Prey Animals • What does a herd of prey do? (Step 1) • Migrate in a direction.

  7. Behavior of Prey Animals • What does a herd of prey do? (Step 2) • SOME migrate in a direction. • SOME eat.

  8. Behavior of Prey Animals • What does a herd of prey do? (Step 3) • SOME migrate in a direction. • SOME eat. • SOME face different directions.

  9. Behavior of Prey Animals • What does a herd of prey do? (Step 4) • Run when there’s a predator.

  10. Influence Map • What it is (in my implementation)… • 2D grid of values, ranging from -2.0 to 2.0. • The blue represents attracting forces (negative values). • The red represents repulsing forces (positive values).

  11. Influence Map • What I do (in my implementation)… • An array of particles serve as the representation for prey. • Simply have x, y for position and x, y for direction. • They start in a random direction and read from the map.

  12. Influence Map • What this does (in my implementation)… • Creates “guided” randomness. (Unpredictable + Logical) • Individual points move uniquely from one another. • Each point’s path across the map is different each time.

  13. Influence Map • How I used this (in my implementation)… • Used walls of red to mimic herding. • Used wall of blue to mimic migration. • Used special green squares to mimic stopping and eating.

  14. Influence Map • A special case (in my implementation)… • The map can be changed in real time to alter behavior. • A special predator mode can simulate predator presence. • Added in a trail of repulsing red squares to mouse.

  15. Why it matters… • You may have the best-looking environments…

  16. Why it matters… • …but you need something to make it feel ALIVE…

  17. Why it matters… • …and something else to make it BELIEVABLE.

  18. End. Demo...

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