Re: webots contest

Olivier Michel wrote:
> I tryed to fix the "last updated" column of the hall of fame. Now, it is 
> a bit better (it looks at all the files in the robot's directory and not 
> only the *.class files as it used to do), but not perfect (as it doesn't 
> yet go recursively into sub directories to perform this check).
> 

Looking at it now, there's a whole bunch of robots that claim to have 
been modified Mar.19, at 16:12.  This seems rather... odd.

> 
> 
>>- How exactly does the distance sensor work in the simulation?  It seems 
>>to vary wildly during test matches.  I've been assuming that it is the 
>>distance to whatever is at the center pixel in the camera's image.  Is 
>>that true?
>> 
>>
> 
> No. You should go to the Preferences of Webots and check the box that 
> display the range of the distance sensor, then you will understand that 
> it is not necessarily the center of the image.
> 

Wow, that's pretty cool.  I missed that option before.  Next question:
Do the camera and distance sensor originate from the same place?  What I 
care about is can I depend on the sensor beam always hitting the same 
pixel in the image?  I'll probably just assume that's the case and hope 
that any offset will be fairly small and not cause too much error.

> 
>>- The legs are mirror images in configuration, but that's not how it 
>>appears in the diagram here: http://roboka.org/images/judoka_servos.png
>>The hip servo order doesn't match between the left and right hips.  I 
>>believe the right hip order is the correct one.
>> 
>>
> 
> Do you mean that some rotation arrows need to be fixed on the image ? 
> Actually I am not the author of it, I believe it was contributed by 
> Frans Klip <[email protected]>. I would be glad to publish a 
> fixed version of it if anyone can contribute it.

It's not the rotation arrows, it's there servo labels for the left hip. 
    Maybe when I have some free time, I'll fix it.

> 
>>- How noisy is the GPS measurement in the online matches?  It's 
>>perfectly accurate offline.  We've started using it for some things 
>>recently, which seem to work fine online as well.  The documentation 
>>says the the position measurements are noisy online, but I haven't seem 
>>it seeming to affect anything in the online matches.
>> 
>>
> 
> Actually, it is not noisy online either. We never implemented this noise 
> for contest matches... Shall we do it before the end of the contest ?

Here I'd disagree with Robotman, for reasons of personal preference.  We 
have a vision system for toddler, and it works quite well.  However, I 
really have no interest in vision.  For me, reliable GPS allows us to do 
extra things that we wouldn't be able to do with just vision.  Actually, 
I would be perfectly happy to have GPS data for the opponent available 
as well.  That would allow us to do even more things that just aren't 
reliable at all with vision.

-Joel


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