Re: breveCreatures screensaver

Hi Jon,

Great -- that fixes the flinging bug.  Two other minor observations: 
First, I wasn't able to reset the population using the option in the 
screen saver panel in System Prefs.  Throwing out the 
breveCreatures.xml file in ~/Library/Preferences did the trick.  
Second, I noticed the version number of version 1.1 says 1.0.

-Clay

On Nov 2, 2005, at 1:24 PM, jon klein wrote:

>
> On Nov 2, 2005, at 3:52 PM, Clayton T. Morrison wrote:
>
>> Jon,
>>
>> The screen saver is very pretty -- I've had it running for several 
>> days now.
>>
>> I do have one suggestion: the creatures sometimes start their run 
>> flying through the air and the fitness test begins while they're 
>> still in the air (I think this happens when they are long and part of 
>> them starts in the floor and the physics rockets them out at high 
>> velocity, or perhaps an instability due to random join setting).  The 
>> result is evolution toward long, thin "fliers" that travel long 
>> distances simply because they started partially embedded in the floor 
>> (or whatever initial condition sends them sailing through the air).  
>> (I'm aware that this may not be guaranteed to happen -- if a 
>> population starts out avoiding this condition, there may be a much 
>> lower probability of it occurring later, and so perhaps no one else 
>> has seen this yet.)  The fix would be to start the fitness test after 
>> they've landed stably on the ground.  Then the search would be over 
>> fitter walkers rather than projectiles.  (Not that I have anything 
>> against projectile locomotion, I just think evolving a walker would 
>> be more interesting...)
>
> Hi Clay,
> thanks for the bug report!
>
> breveCreatures has been updated to version 1.1 and the problem has 
> been fixed:
>
> http://www.spiderland.org/breve/breveCreatures.html
>
> Please let me know whether you encounter any other bugs or unrealistic 
> behaviors!
>
> - jon klein
> _______________________________________________
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>
>
Clayton T. Morrison
Postdoctoral Research Fellow
Center for Research on Unexpected Events (CRUE)
USC Information Sciences Institute
[email protected]
(310) 448-8430

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