Problems with defining segments

[Transaural Bas]

Hello Arnaud,

First of all, I would like to congratulate you for this magnificent piece of software. It is as good as the pro ones but freeware, which makes live easy for teachers like me. In fact, I am preparing some experiments to perform with my students.

Having said that, I must admit I am a newbie in the matter. Sorry if I am making a huge mistake in my demands.

The question is that I have a Optitrack MoCap system working with 8 v100:r2 cameras with the Motive Full Body software provided by the company (http://www.naturalpoint.com/optitrack/products/motive/). I can export the data in c3d format and the problem comes when I try to create segments out of markers. For example, if I select the following markers:

RANK Right ankle
RTOE Right toe

to create a segment called RightFoot, the software does not allow me to do it. Have a look at these screenshots:

As you can see, the OK button is not activated, which means I am doing something wrong. I have searched on the help pages and documentation but with no luck.

Would you be so kind to let me know what I am doing wrong?

Thanks in advance,

Basilio

[Arnaud Barré]

Hello Basilio

Thanks a lot for your feedback. I’m proud you find Mokka useful and it helps you in your teaching.

Regarding the creation of the segment, only one step is missing: the creation of links (or faces) between markers. To do that, you only need to press on the key ‘e’ or ‘f’ when some markers are selected as you did in your second screenshot. Pressing on ‘e’ create links (or edges) between markers, while pressing on ‘f’ will create a triangle between selected markers (the selection of 3 markers is required in this case).

I should modify the user interface for the creation of a segment. You are not the first user who has issue with it.

Arnaud

On Dec 29, 2013, at 6:12 AM, Transaural Bas <trans...@gmail.com> wrote:

> Hello Arnaud,
>
> First of all, I would like to congratulate you for this magnificent piece of software. It is as good as the pro ones but freeware, which makes live easy for teachers like me. In fact, I am preparing some experiments to perform with my students.
>
> Having said that, I must admit I am a newbie in the matter. Sorry if I am making a huge mistake in my demands.
>
> The question is that I have a Optitrack MoCap system working with 8 v100:r2 cameras with the Motive Full Body software provided by the company (http://www.naturalpoint.com/optitrack/products/motive/). I can export the data in c3d format and the problem comes when I try to create segments out of markers. For example, if I select the following markers:
>
> RANK Right ankle
> RTOE Right toe
>
> to create a segment called RightFoot, the software does not allow me to do it. Have a look at these screenshots:
>
>
>
>
>
>
>
>
>
>

> As you can see, the OK button is not activated, which means I am doing something wrong. I have searched on the help pages and documentation but with no luck.
>
>
>
> Would you be so kind to let me know what I am doing wrong?
>
>
>
> Thanks in advance,
>
> Basilio
>
>

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[Transaural Bas]

Hello Arnaud,

Thanks for your feedback. Now I have completed the model and I can continue investigating this fantastic software.

All the best,
Basilio

[Transaural Bas]

Hello again Arnaud,

I am still discovering all the details of the program. My idea is to perform a complete take with the optitrack system and let students to do the rest of the steps. The first one before analysis is to clean and arrange all the markers: every time a marker is not seen by the system, a new one is created. The user must select all the missed markers and associate them to the proper one. This preprocessing can be done in the motive software (the one that comes with the optitrack cameras), but I was wondering if your software could do it as well. My aim is to let all the students do this important step and not doing myself, handing them out all the data clean and without occlusion problems. I tried to look for a way to do it with Mokka but without success. Is that possible? If not, would you mind to tell me an open source/freeware software that can do this processing, in case you know?

Sorry for asking this straight, but I am a bit lost in this issue.

All the best for year 2014!

Basilio

El domingo, 29 de diciembre de 2013 13:52:59 UTC+1, Arnaud BARRE escribió:

[Arnaud Barré]

Hello Basilio,

Unfortunately, what you are asking for is not possible with Mokka. It is not possible to assign a part of a marker trajectory to another. I do not know any other open-source software able to do this.

All the best for year 2014!

Arnaud

[Transaural Bas]

Hello again,

Thanks for your quick answer. Your support is very much appreciated.

Best regards,
Basilio

[Charlotte Le Mouel]

Hello Arnaud,

I have just discovered Mokka and I am having the same problem with defining segments. I'm not quite sure I understand your answer: when I press e on my keyboard after having selected 2 markers, nothing happens. And no links appear when I try to create a New Segment. Could you please let me know what it is I am doing wrong?

All the best,

Charlotte

[fabien leboeuf]

hello Charlote
 
Don t know what you did precisely.

build a segment through Mokka is simple.

two options.

- use the Mokka user interface, select  markers, click new segment, a new window comes up. select once again markers and type e or f, depending you want to build an edge or a face.

- 2nd option, edit the mvc file. It s just a xml file. have lok at the attached file.

Notice if you use vicon, you can call the vsk as mvc (mokka visual configuration) file

cheers

fabien

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Fabien 

Fabien Leboeuf

Research fellow ( University of salford)

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