[Dprglist] Fwd: LF intersection angle rule

[Doug Paradis]

David,
      Going from entry point to exit point is not considered enough. You
have to follow the line. For example, the segmented S curves, the robot
needs to follow the curve  and make an S type movement. Another example is
the stain elements, the robot needs to follow the line across the stain not
follow the outside edge of the stain.

Regards,
Doug P.

On Sun, Dec 10, 2017 at 1:11 AM, David Anderson <davida at smu.edu> wrote:

> Great meeting today.
>
> Doug, I have a question based on Ron and Carl's presentations, perhaps it
> has already been answered, to wit:
>
> As I understand, the line following course consists of an assembly of
> square tiles, each of which has an entry and exit point.
>
> Is it sufficient for the robot to just identify the entry and exit points,
> and drive directly from one to the other?
>
> That is, it would not follow the line per se, though with sufficiently
> large robot the differences would probably be pretty negligible, but it
> would follow the course.
>
> thanks,
> dpa
>
>
>
> On 12/09/2017 08:18 AM, Doug Paradis wrote:
>
> John,
>     Currently, the intersecting lines are always straight and all
> intersections are 90 degrees. Curves lines at an intersection would be a
> possible addition to further challenge courses (interesting idea). The link
> to the course layout is at
> https://www.dprg.org/wp-content/uploads/2017/11/DPRG-
> Roborama-2011b-Challenge-Level-LF-Course.pdf
> <https://www.dprg.org/wp-content/uploads/2017/11/DPRG-Roborama-2011b-Challenge-Level-LF-Course.pdf>
> If you have any additional questions, let me know. I would love to see your
> work on the tests that you are developing.
>
> Regards,
> Doug P.
>
> On Sat, Dec 9, 2017 at 12:36 AM, John Swindle <swindle at compuserve.com>
> wrote:
>
>> Doug,
>>
>> I'd say the crossing in your drawing was about either 30 degrees or 150
>> degrees, and since it could come in on either side, I'd have to look for
>> both. I am not asking that the rules state which side the angle is measured
>> from. My issue is that I am developing a two-step test that covers all the
>> conditions in the Challenge, but in the steps I need to include something
>> that rejects the intersections. I am OK with rejecting any line that is 70
>> degrees to 110 degrees on either side. If the intersecting line is
>> straight, the test is a bit more robust. If each side is 70 to 110 degrees
>> (a bent intersecting line), my two-step test might fail.
>>
>> Doing it "that's just wrong" way,
>> John Swindle
>>
>>
>> -----Original Message-----
>> From: Doug Paradis <paradug at gmail.com>
>> To: John Swindle <swindle at compuserve.com>
>> Cc: DPRG <dprglist at lists.dprg.org>
>> Sent: Fri, Dec 8, 2017 11:52 pm
>> Subject: Re: LF intersection angle rule
>>
>> John,
>>     In the challenge course, all the intersections are 90 degrees. The
>> rule was written to allow crossing variations in the future. I'm thinking
>> that  70-90 degrees would represent the smallest angle of the intersection.
>> I not sure that is right, just the way I would interpret the angle.
>> if you saw an intersection that was like this:
>>            |   /
>>            | /
>>            /
>>          / |
>>         /  |
>>        /   |
>>
>> What angle would you say the intersection was?
>>
>> Regards,
>> Doug P.
>>
>> On Fri, Dec 8, 2017 at 9:03 PM, John Swindle < <swindle at compuserve.com>
>> swindle at compuserve.com> wrote:
>>
>> Doug,
>>
>> The Line Following Challenge rules say "Intersections may cross with
>> angles of 70 - 90 degrees." Doesn't that really mean 70 to 110 degrees? Is
>> the intersecting line straight, or can it bend at the intersection?
>>
>> Thanks,
>> John Swindle
>>
>>
>>
>>
>
>
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