Subject:
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Re: rtlToronto15 January issues
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Newsgroups:
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lugnet.org.ca.rtltoronto
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Date:
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Mon, 25 Aug 2003 16:35:46 GMT
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Viewed:
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432 times
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On Mon, Aug 25, 2003 at 04:22:43PM +0000, Chris Magno wrote:
> > Wouldn't you have to mark the "correct" way on each joint, and have
> > different markers for the two sides to follow? One robot would
> > follow the "red" markings, while the other follows the "blue"?
>
> Dan, at the last dinner (which you missed) :)
Hey, INS was getting possessive, and didn't want to let me leave the
country. Now that that's fixed, maybe we'll visit for the next event :)
> derek pointed out that any marking is pointless cause you don't know
> from which angle the robot is reading the mark.
>
> at a simple "T" a read stripe means turn left.... BUT if the robot
> reads that red stripe from the "front" or the "back" the same go left
> code could send it in either direction.
Maybe I'm dense. Actually, forget the maybe - but here's what I'm
thinking of (bad ascii art follows):
v
*---<T>---<T>--<T>---*
blue | | | red
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+----<T>---+
^
T - a T joint (duh!)
> - a blue marker
< - a red marker
Calum was saying that at each T joint, there would be a marker as to the
"right" way to go to reach the objective. But, you could go on
alternate routes and still find your way back using markers.
So the blue bot, gets to the first T, and can either follow the blue
marker, or go explore. Then, when it gets to the second T, it has the
same options - follow the blue marker (which would point it twards a way
to the objective), or go explore. If it gets to the T marked with a
'v', and chooses to go down, it will reach the next 'T' (marked with a
'^'), and know it needs to reverse directions in order to reach it's
objective. All the while, the Red robot doesn't care about all these
blue marks, as it's looking for red ones.
Does that make sense? Should I go sit on the sidelines a little longer?
:)
--
Dan Boger
dan@peeron.com
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Message has 2 Replies:
 | | Re: rtlToronto15 January issues
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| (...) I blame the ascii art. :) this is the problem I see. (more ascii art) 1 2 ---...--- I red I I I 3 OK, put a robot at the base of the T. (number 3) as it drives up the pipe, it reads the RED tape. so it should turn left to the # 2. so far easy. (...) (21 years ago, 25-Aug-03, to lugnet.org.ca.rtltoronto)
| | | Re: rtlToronto15 January issues
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| (...) I like it. The original thought was that before each joint there would be 1 strip or 2 1 strip means 'go left' (as left as left can be in a 3 d grid), or 2 stripes means go right (again, same). As pointed out, however, which way's left or (...) (21 years ago, 25-Aug-03, to lugnet.org.ca.rtltoronto)
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Message is in Reply To:
| | Re: rtlToronto15 January issues
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| (...) Dan, at the last dinner (which you missed) :) derek pointed out that any marking is pointless cause you don't know from which angle the robot is reading the mark. at a simple "T" a read stripe means turn left.... BUT if the robot reads that (...) (21 years ago, 25-Aug-03, to lugnet.org.ca.rtltoronto)
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