Beginner in Anybody

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1

Hallo,

I’m a new user of the Anybody software. I’ve done already several
tutorials to become familiar with the Anyscript language.

But in my opinion it is a big step now, to do more complex models.

First I wanted to get the joint reaction force and some muscle
forces in the lower extremity during several activities:

  • gait, stairways etc.

The gait model is already available, so I can change now the walking
speed under JointsandDrivers.any?

Do I have to provide every full body model with ground reaction
forces or only the version of the lower extremities?

How can I simulate in the easiest way stairway walking? By changing
the gait model or do I have to build an own model bottom up?

Where can I get driver informations for several activities (as going
stairways etc.)? (Bergmann etc?)

I hope you can give me further advice as I’m only a beginner in body
modeling.

Best regards

2

Hi ?

The gait model is driven by maker trajectories, so each marker have
a vector of time values and with corresponding recorded positions.

This setup means that the motion are parameterized in terms of
marker positions, so there are no easy way to make the gait faster.
The only way to do so would be to change the timevector of all the
markers and force plate data.

About the ground reaction forces:
You can run a model with or without measured reaction forces to the
enviroment around it. If you have measured forces these are applied
like for example in the Gait3D model. If the forces have not been
measured you need to apply the correct kind of boundary conditions
to the environment. A good example of this is the
PedalDemoConditonal here the model push a pedal with a predefined
load on and the reaction force between the foot and the pedal is
automatically determined.

We do not at the moment have a model walking on stairs but in
principle it can be made in the same way as the Gait3D model. You
will need marker data from a stair experiment to drive it.

Bergman has published the Hip98 CD you can download it from this
link

http://www.charite.de/bml/main.php?
action=literature&lc=30&li=t&ta=350#art350

I think there are some data there for walking on stairs, but i am
not sure.

Before attempting to make your own model i would recomend that you
carefully browse through the Gait3D model. Especially the
JointAndDrivers.any file, here it is essential to understand the
concept of the AnyKinLinear measures which can measure either in
global coordiantes of local coordinates by chaniging the Ref
property.

On www.anybodytech.com you will also be able to find a webcast on
the gait model which might be usefull.

Please ask again if you have further questions.

Best regards
Søren AnyBody Support

— In anyscript@yahoogroups.com, “knox40” <knox40@…> wrote:
>
> Hallo,
>
> I’m a new user of the Anybody software. I’ve done already several
> tutorials to become familiar with the Anyscript language.
>
> But in my opinion it is a big step now, to do more complex models.
>
> First I wanted to get the joint reaction force and some muscle
> forces in the lower extremity during several activities:
> - gait, stairways etc.
>
> The gait model is already available, so I can change now the
walking
> speed under JointsandDrivers.any?
>
> Do I have to provide every full body model with ground reaction
> forces or only the version of the lower extremities?
>
> How can I simulate in the easiest way stairway walking? By
changing
> the gait model or do I have to build an own model bottom up?
>
> Where can I get driver informations for several activities (as
going
> stairways etc.)? (Bergmann etc?)
>
> I hope you can give me further advice as I’m only a beginner in
body
> modeling.
>
> Best regards
>

3

Dear Soren,

i have a question regarding this gait issue …is it possible that is you
have the motion capture data for the markers in the Gait3D model to copy and
paste these data in each of the text files of the corresponding marker, and
to run the model simply using your new data? if yes, what about the force
plate data file, do you still can do the same (copy and paste)? and is the
configuration of the force plates in the Gait3D model provided in AnyBody?

Best regards

On 8/30/07, AnyBody Support <support@anybodytech.com> wrote:
>
> Hi ?
>
> The gait model is driven by maker trajectories, so each marker have
> a vector of time values and with corresponding recorded positions.
>
> This setup means that the motion are parameterized in terms of
> marker positions, so there are no easy way to make the gait faster.
> The only way to do so would be to change the timevector of all the
> markers and force plate data.
>
> About the ground reaction forces:
> You can run a model with or without measured reaction forces to the
> enviroment around it. If you have measured forces these are applied
> like for example in the Gait3D model. If the forces have not been
> measured you need to apply the correct kind of boundary conditions
> to the environment. A good example of this is the
> PedalDemoConditonal here the model push a pedal with a predefined
> load on and the reaction force between the foot and the pedal is
> automatically determined.
>
> We do not at the moment have a model walking on stairs but in
> principle it can be made in the same way as the Gait3D model. You
> will need marker data from a stair experiment to drive it.
>
> Bergman has published the Hip98 CD you can download it from this
> link
>
> http://www.charite.de/bml/main.php?
> action=literature&lc=30&li=t&ta=350#art350
>
> I think there are some data there for walking on stairs, but i am
> not sure.
>
> Before attempting to make your own model i would recomend that you
> carefully browse through the Gait3D model. Especially the
> JointAndDrivers.any file, here it is essential to understand the
> concept of the AnyKinLinear measures which can measure either in
> global coordiantes of local coordinates by chaniging the Ref
> property.
>
> On www.anybodytech.com you will also be able to find a webcast on
> the gait model which might be usefull.
>
> Please ask again if you have further questions.
>
> Best regards
> Søren AnyBody Support
>
> — In anyscript@yahoogroups.com <anyscript%40yahoogroups.com>, “knox40”
> <knox40@…> wrote:
> >
> > Hallo,
> >
> > I’m a new user of the Anybody software. I’ve done already several
> > tutorials to become familiar with the Anyscript language.
> >
> > But in my opinion it is a big step now, to do more complex models.
> >
> > First I wanted to get the joint reaction force and some muscle
> > forces in the lower extremity during several activities:
> > - gait, stairways etc.
> >
> > The gait model is already available, so I can change now the
> walking
> > speed under JointsandDrivers.any?
> >
> > Do I have to provide every full body model with ground reaction
> > forces or only the version of the lower extremities?
> >
> > How can I simulate in the easiest way stairway walking? By
> changing
> > the gait model or do I have to build an own model bottom up?
> >
> > Where can I get driver informations for several activities (as
> going
> > stairways etc.)? (Bergmann etc?)
> >
> > I hope you can give me further advice as I’m only a beginner in
> body
> > modeling.
> >
> > Best regards
> >
>
>
>

[Non-text portions of this message have been removed]

4

Dear Soren,

I have another question regarding playing with the Gait3D model…
If you want to use that model and you have some other subject with a
different height (taller or shorter) than the data (dimensions) of the
person in the example provided and you tried to type in these dimensions say
for the thigh and it was taller, so when you load the model you will see the
legs going through the force plates in the model and then the Inverse
analysis will not function…
so how you can scale the model again according to the new dimensions/heights
to fit and stay in touch with the force plates and have the model working.

Thanks so much for your cooperation.

Best regards

[Non-text portions of this message have been removed]

5

Hi

In principle this is possible, but there are more changes thats
needs to be done to make this approach work.

If you replace all the marker data with new marker data you will
almost certain have a model that will not run kinemtically. First of
all the data could come from a person of a different size, secondly
the start location of the marker and the person could be different
from the previous data set. So to make it work you will need a good
guess on the starting position of the human that will match as close
as possible the starting position of the new data set. Similarly you
need to change the AnyMan.any file to obtain a person of the correct
size.

About the force plates i am a bit unsure what you mean, it wil try
to answer. In the Gait3D model the force plates are modeled
according to the data we had available, this was center of pressure
location, force and moment. If you have the same data avaible you
can do the copy and paste in prinple. If the data is provided in
another way than this, the environment.any file needs to rebuild. In
principle there are no restrictions on how the force plate data
should look like, in almost any case an environment.any file can be
made that will work on the data provided.

Best regards
Søren

— In anyscript@yahoogroups.com, “Moataz Eltoukhy” <meltoukhy@…>
wrote:
>
> Dear Soren,
>
> i have a question regarding this gait issue …is it possible
that is you
> have the motion capture data for the markers in the Gait3D model
to copy and
> paste these data in each of the text files of the corresponding
marker, and
> to run the model simply using your new data? if yes, what about
the force
> plate data file, do you still can do the same (copy and paste)?
and is the
> configuration of the force plates in the Gait3D model provided in
AnyBody?
>
> Best regards
>
> On 8/30/07, AnyBody Support <support@…> wrote:
> >
> > Hi ?
> >
> > The gait model is driven by maker trajectories, so each marker
have
> > a vector of time values and with corresponding recorded
positions.
> >
> > This setup means that the motion are parameterized in terms of
> > marker positions, so there are no easy way to make the gait
faster.
> > The only way to do so would be to change the timevector of all
the
> > markers and force plate data.
> >
> > About the ground reaction forces:
> > You can run a model with or without measured reaction forces to
the
> > enviroment around it. If you have measured forces these are
applied
> > like for example in the Gait3D model. If the forces have not been
> > measured you need to apply the correct kind of boundary
conditions
> > to the environment. A good example of this is the
> > PedalDemoConditonal here the model push a pedal with a predefined
> > load on and the reaction force between the foot and the pedal is
> > automatically determined.
> >
> > We do not at the moment have a model walking on stairs but in
> > principle it can be made in the same way as the Gait3D model. You
> > will need marker data from a stair experiment to drive it.
> >
> > Bergman has published the Hip98 CD you can download it from this
> > link
> >
> > http://www.charite.de/bml/main.php?
> > action=literature&lc=30&li=t&ta=350#art350
> >
> > I think there are some data there for walking on stairs, but i am
> > not sure.
> >
> > Before attempting to make your own model i would recomend that
you
> > carefully browse through the Gait3D model. Especially the
> > JointAndDrivers.any file, here it is essential to understand the
> > concept of the AnyKinLinear measures which can measure either in
> > global coordiantes of local coordinates by chaniging the Ref
> > property.
> >
> > On www.anybodytech.com you will also be able to find a webcast on
> > the gait model which might be usefull.
> >
> > Please ask again if you have further questions.
> >
> > Best regards
> > Søren AnyBody Support
> >
> > — In anyscript@yahoogroups.com <anyscript%
40yahoogroups.com>, “knox40”
> > <knox40@> wrote:
> > >
> > > Hallo,
> > >
> > > I’m a new user of the Anybody software. I’ve done already
several
> > > tutorials to become familiar with the Anyscript language.
> > >
> > > But in my opinion it is a big step now, to do more complex
models.
> > >
> > > First I wanted to get the joint reaction force and some muscle
> > > forces in the lower extremity during several activities:
> > > - gait, stairways etc.
> > >
> > > The gait model is already available, so I can change now the
> > walking
> > > speed under JointsandDrivers.any?
> > >
> > > Do I have to provide every full body model with ground reaction
> > > forces or only the version of the lower extremities?
> > >
> > > How can I simulate in the easiest way stairway walking? By
> > changing
> > > the gait model or do I have to build an own model bottom up?
> > >
> > > Where can I get driver informations for several activities (as
> > going
> > > stairways etc.)? (Bergmann etc?)
> > >
> > > I hope you can give me further advice as I’m only a beginner in
> > body
> > > modeling.
> > >
> > > Best regards
> > >
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>

6

Hi

The “AnyMan.any” can be used for scaling the model to fit the size
of a subject. Here you can type in the directly the segment length,
etc.

Best regards
Søren AnyBody Support

— In anyscript@yahoogroups.com, “Moataz Eltoukhy” <meltoukhy@…>
wrote:
>
> Dear Soren,
>
> I have another question regarding playing with the Gait3D model…
> If you want to use that model and you have some other subject with
a
> different height (taller or shorter) than the data (dimensions) of
the
> person in the example provided and you tried to type in these
dimensions say
> for the thigh and it was taller, so when you load the model you
will see the
> legs going through the force plates in the model and then the
Inverse
> analysis will not function…
> so how you can scale the model again according to the new
dimensions/heights
> to fit and stay in touch with the force plates and have the model
working.
>
> Thanks so much for your cooperation.
>
> Best regards
>
>
> [Non-text portions of this message have been removed]
>