Re: breveCreatures screensaver

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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