Re: [simspark-devel] New User Manual and Wiki

[Hedayat V. <hed...@gm...>]

Hi Stefan,

/*Stefan Glaser <gla...@gm...>*/ wrote on 05/12/2011 6:15:33 PM 
+0450:
> Hallo all,
>
> I'm currently updating the descriptions in the wiki according to the new
> release. I was able to look up / get most of the information I was
> looking for, but two questions are still not clear to me, which I now
> want to ask you in this mail.
Thanks a lot for your efforts :)

> First of all, I wanted to ask for the unit transmitted by the
> accelerometer. I wanted to document that it now provides RAW-data, but
> it's unclear to me, what's the real meaning of that. Can someone give me
> a pointer on that?
It is the difference of velocity for the body part reported by ODE 
divided by the spent time. AFAIK, ODE uses SI units, so the reported 
acceleration should be in m/s^2.

About lines, probably Yuan can provide some help. :P

Good luck!
Hedayat

> The socond problem I'm unclear about is the description of the field
> lines. I visualized the field lines to get some idea, where they are
> located and why the agent sees so much of them. Then I realized that the
> middle circle is modelled with 10 small field lines. If the complete
> circle is seen (what is often the case for most of the robots during a
> game), this results in 20 coordinates located around a relatively small
> spot in a very simple arrangment, also supported by the middle line. I
> wonder about the purpose of putting in this kind of modelling of the
> middle circle. 20 coordinates is a lot of traffic - in fact close to 50%
> of the currently visible field lines are needed to model the middle
> circle. I'm also not sure how realistic this is compared to a real
> scenario... but I have no experience with that. But since I expect the
> vision-errors to be applied separately on each coordinate, it should be
> absolutely no problem to do e.g. a camera calibration within a few cycles.
> Overall I struggle a bit with giving a clear decription to the field
> lines. The normal lines don't need a special description, but if the
> middle circle stays this way, I have to add some special description to
> the arrangement of these lines.
>
> Best regards,
> Stefan
>
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