Fish

aboeing · 2003-09-07T21:41:38

Hi, I am trying to implement a schooling fish behaviour, and have applied some of the concepts from boids, but my fish act very much like birds. (Specifically they either follow the "destination" point in a V-formation, or, if I change the parameters enough they will form a sphere around the destination - neither is how fish move) So can anyone tell me either whats wrong with my code, or what parameters / extra influences I need on the fish. Cheers. void CalcDir(Boid *b, int me, int nBoid) { Vector3 heading; heading = dest-pos; heading.Normalize(); // dir=heading; float ndiv; ndiv=0; Vector3 seperation; Vector3 alignment; seperation=Vector3(0,0,0); alignment=Vector3(0,0,0); Vector3 centerpos=pos; for (int i=0;i<nBoid;i++) { if (i==me) continue; Vector3 dist; dist=pos-b[i].pos; float md; md=dist.Mag(); float tsize=percieved_size+b[i].size; if (md<tsize) { centerpos+=b[i].pos; float severity=(tsize-md)/tsize; //0..1 severity*=2; severity*=severity; seperation+=(dist*severity); ndiv++; alignment+=b[i].dir; } } if (percieved_size>size) { percieved_size/=1.1f; } if (percieved_size<size) { percieved_size=size; } centerpos=centerpos/ndiv; Vector3 cohesion; cohesion = centerpos-pos; cohesion.Normalize(); seperation.Normalize(); alignment.Normalize(); //changing the parameters below changes the 'behaviour' of the fish. dir=(heading*1.0f)+(seperation*0.3f)+(alignment*0.2f)+(cohesion*0.8f); dir.Normalize(); dacl=dir; //set the direction of the acceleartion of the fish } [edited by - aboeing on August 8, 2003 10:52:10 AM]

Artificial Intelligence Programming

Started by aboeing August 08, 2003 09:48 AM

20 comments, last by aboeing 20 years, 7 months ago

aboeing

180

Author

September 02, 2003 09:12 PM

heh, uh yeah sorry, maybe i shouldof made it clearer.

Download the program here

That program will show a number of fish swimming around, and requires Windows and DirectX 8.1.

me:www.adrianboeing.com

johnnyBravo

100

September 07, 2003 09:36 PM

experiment with the fisht movingin the average direction of all other fish and add a slight inaccuracy to that direction and that would make the fish school turn etc while all following each other.

I did this and added a shark, it looked ok

also wen the fish are scared they ignore everything and run until certain distance away

that would be Pi radians direction from shark + a slight left or right to get away

[edited by - johnnyBravo on September 7, 2003 10:41:38 PM]

Fish

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Fish

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