Comments on: Boids

By: Ben

Ben — Tue, 03 Nov 2009 20:03:45 +0000

Hi Rocco,

I don’t know much about the Blender game engine, but I imagine it has something similar to the pygame main game loop. Sorry I couldn’t be of any more help!

Ben

By: Rocco

Rocco — Thu, 29 Oct 2009 15:54:05 +0000

Yaeh, that’s what i thought. One last question: there are several references to pygame which of course i will get rid of but that ruins the code. i am taking acloser look to see what fixes i can make, in the meantime any help you can offer. I am using thescript in Blender game engine, which is easy to use. of i added what i needed to make it work in blender but am a little hazy on how to fill the pygame while loop for example

By: Ben

Ben — Wed, 28 Oct 2009 15:44:57 +0000

Hi Rocco,

Yes this is a 2D version of boids. A 3D version would follow exactly the same principles, you just need to add extra calculations for the z axis. So where the x and y values are calculated just as another calculation for z.

Hope that helps!

Ben

By: Rocco

Rocco — Wed, 28 Oct 2009 15:27:30 +0000

Looks good but i think it is only 2d correct? Is there a 3d version? i use blender so i guess i would have to change it a bit, the boids at blender work great but are not supported by the game engine ( i am trying to develop a sim) so i am trying to write my own boids. I was trying to make 3d boids that would also scatter when a predator comes around. I just stared learning python but don’t know much, any help you can give or if you have a 3d version would be great

By: Ben

Ben — Thu, 05 Mar 2009 12:32:41 +0000

@lgwe: Yes. Sorry, the download link to the full source code (including this missing code) was broken. I’ve just fixed it.

By: lgwe

lgwe — Thu, 05 Mar 2009 12:09:22 +0000

My guess on the missing functions:

at the beginning add:

import pygame
import random
import math

in the Boid class add:

def distance(self, bb):
return math.sqrt((self.x-bb.x)**2 + (self.y -bb.y)**2)

def move(self):
self.x += self.velocityX
self.y += self.velocityY

By: James Frost

James Frost — Sun, 18 May 2008 18:46:52 +0000

That’s fantastic – thank you!

By: admin

admin — Sun, 18 May 2008 18:44:10 +0000

Sorry, I thought I’d posted all of the code, but you’re right some is missing. I’ve added a link at the bottom to download the full source code.

Let me know if you’ve got any questions about any of it.

By: James Frost

James Frost — Sun, 18 May 2008 17:19:35 +0000

The functions to move the boids, and to get their distance to another boid are missing. I tried to re-create them, but clearly something’s rather wrong with my maths, as all the boids just head to the 4 corners of the screen!

By: admin

admin — Sun, 18 May 2008 17:16:54 +0000

All the code is listed here. You will need to import pygame, but once you’ve done that there shouldn’t be any missing functions.

What errors have you seen when you try to run it?