Re: Banana effect

Hi,

No changes were introduced in the Physics recently. I saw how your robot 
is falling after its first step, but that seems to occur only to your 
robot (other robots don't seems to have this problem). I have no 
explanation for that. Since how long did you observed this behavior ?

However, after looking at  RoboMarci_vs_yarivus.wva, it seems that you 
walking gait is very unstable: after each step the robot is balancing 
like if it will fall down and finally get stabilized by chance (no wind 
hopefully! ;). The reason why it falls down with BruceTheShark is 
probably because the timing of the movement are slightly different than 
with another competitor. Since the Judo controllers are asynchronous, 
the result of the same controller may be different depending on the load 
of the computer. Maybe because Bruce's controller is also computer 
expensive, the amount of time for your calculation is limited and hence 
the robot_step may not complete with a similar return value as on your 
computer: see 
http://cyberboticspc1.epfl.ch/cdrom/common/doc/webots/reference/section3.1.html#robot_step 
for more details about this. Hence if your walking gait is a bit 
unstable, it may turn out to be very unstable when the timing changes a 
little bit...

I'd recommand you to improve the robustness of your walking gait to get 
a better performance...

-Olivier

Marton Laszlo wrote:

>Hi Olivier,
>
>There was some changes in the physics engine?
>
>Because finally RoboMarci has beaten Vertigo :D,
>But after a few rounds I observed (with BruceTheShark)
>a strange effect, something like that the robot
>stepped onto a banana and he slipped.
>
>So I'm wondering is my step sequence is wrong, but
>then why works on my computer and sometimes in the
>content!
>(RoboMarci vs BruceTheShark  slipped and RoboMarci vs
>yarivus OK)
>
>
>Could you give some tips for me?
>
>Thanks
>Laszlo Marton
>  
>



 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
     http://groups.yahoo.com/group/webots-contest/

<*> To unsubscribe from this group, send an email to:
     [email protected]

<*> Your use of Yahoo! Groups is subject to:
     http://docs.yahoo.com/info/terms/