Hi,
I’m working with the anybody gait model, and would like to change the
marker set from the current Kit Vaughan marker set, to the Helen Hayes
Vicon VCM (Roy Davis) marker set.
What changes would I have to make in the Anyscript files?
I would also like to know how exactly the markers are used to define
bone structure and drive the model.
I look forward to hearing from you.
Heena
Hi Heena
Welcome to the group
I am afraid that this is a complex question which is difficult to answer in
detail.
First of all it is important to understand the way the current model relies
on selecting and driving individual dof from each marker and is measuring in
the local coordinate system of the segments, not the global ref system. I
think the way to shift the marker set, is to identify equivalent markers in
the Helen Hayes marker set, that “resembles” the markers from Kit Vaughan.
By “resembles” I mean that marker can be used for driving the same dof in
the model. So as example find a knee marker in the Helen Hayes markerset
and replace it with a knee marker in the current gait model and so on. So
you need to do multiple changes in the JointAndDriver.any file to shift the
markerset.
There is a webcast “GaitModeling” about the gait model please see
http://www.anybodytech.com/199.0.html this will give you more information
about how the model is driven and the concept behind (you need to log into
the user area of www.anybodytech.com <http://www.anybodytech.com/> to see
this, it is free)
The GaitModel is not the simplest one in terms of kinematics, if you have
not done so, I would recommend to go through the tutorials. Especially the
one about the mechanical elements http://www.anybodytech.com/675.0.html
I hope this helps you move on, otherwise please write again.
Best regards
Søren, AnyBody support
From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com] On Behalf
Of sann2392
Sent: 12 November 2007 13:20
To: anyscript@yahoogroups.com
Subject: [AnyScript] Anybody Gait Model
Hi,
I’m working with the anybody gait model, and would like to change the
marker set from the current Kit Vaughan marker set, to the Helen Hayes
Vicon VCM (Roy Davis) marker set.
What changes would I have to make in the Anyscript files?
I would also like to know how exactly the markers are used to define
bone structure and drive the model.
I look forward to hearing from you.
Heena
[Non-text portions of this message have been removed]
Hey Søren
Thanks for your previous reply.
I did as you said, and had a look at the JointsAndDriver.any file,
but the markers which I need to change, these being p4 & p11 (right
and left tibial tubercle) and p6 & p13 (right and left greater
trochanter) don’t seem to be present in this file. Does that mean
that these are not used in driving the model? Are they merely used
for defining the model at the start?
I would like to replace these four markers with their equivalent in
the Helen Hayes marker set, i.e. replace p4 & p11 with tibial wands,
and p6 & p13 with femoral wands. Since they’re not present in the
JointsAndDriver.any file does that mean I would not have to make any
changes in that file?
Look forward to hearing from you.
Heena
— In anyscript@yahoogroups.com, “AnyBody Support” <support@…>
wrote:
>
> Hi Heena
>
>
>
> Welcome to the group
>
>
>
> I am afraid that this is a complex question which is difficult to
answer in
> detail.
>
>
>
> First of all it is important to understand the way the current
model relies
> on selecting and driving individual dof from each marker and is
measuring in
> the local coordinate system of the segments, not the global ref
system. I
> think the way to shift the marker set, is to identify equivalent
markers in
> the Helen Hayes marker set, that “resembles” the markers from Kit
Vaughan.
> By “resembles” I mean that marker can be used for driving the same
dof in
> the model. So as example find a knee marker in the Helen Hayes
markerset
> and replace it with a knee marker in the current gait model and so
on. So
> you need to do multiple changes in the JointAndDriver.any file to
shift the
> markerset.
>
>
>
> There is a webcast “GaitModeling” about the gait model please see
> http://www.anybodytech.com/199.0.html this will give you more
information
> about how the model is driven and the concept behind (you need to
log into
> the user area of www.anybodytech.com
<http://www.anybodytech.com/> to see
> this, it is free)
>
>
>
> The GaitModel is not the simplest one in terms of kinematics, if
you have
> not done so, I would recommend to go through the tutorials.
Especially the
> one about the mechanical elements
http://www.anybodytech.com/675.0.html
>
>
>
> I hope this helps you move on, otherwise please write again.
>
>
>
> Best regards
>
> Søren, AnyBody support
>
>
>
> _____
>
> From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com]
On Behalf
> Of sann2392
> Sent: 12 November 2007 13:20
> To: anyscript@yahoogroups.com
> Subject: [AnyScript] Anybody Gait Model
>
>
>
> Hi,
>
> I’m working with the anybody gait model, and would like to change
the
> marker set from the current Kit Vaughan marker set, to the Helen
Hayes
> Vicon VCM (Roy Davis) marker set.
>
> What changes would I have to make in the Anyscript files?
>
> I would also like to know how exactly the markers are used to
define
> bone structure and drive the model.
>
> I look forward to hearing from you.
>
> Heena
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
Hi Heena
That is correct i also browsed through the JointAndDriver.any file and these
markers are not used for driving the model.
Basically these markers are not used for anything they are just visualized
so that it is possible to visually judge the distance between the marker on
the model and the equivalent free recorded marker.
As described in the webcast the leg has only 18 dof so we can only drive
these 18 dof, no more no less. This makes it impossible (using the procedure
in the Gait3D model) to make use of all the markers. So some of them like
the ones you have mentioned are not used for driving the model.
I do not think that you should try to make use of these markers unless you
have a good reason for it. So if you have found equivalent markers for all
the remaining markers I would not recommend including these markers.
If you have the same marker numbering for all the remaining markers you
should not make changes in the JointAndDriver.any I file I guess.
It is normally a good idea to go though the JointAndDrivers.any file and
make a small sketch of the model, it is important to understand the concept
of the “Ref=0” in the AnyKinLinear measures. This “Ref=0” ensures that each
marker is measuring wrt to its own coordinate system. If you are in doubt
about the orientation of a coordinate system you can always draw a
coordinate system (by writing AnyDrawRefFrame drw={}; inside the refnode)
Please ask again if you have more questions…
Best regards
Søren, anybody Support
From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com] On Behalf
Of sann2392
Sent: 19 November 2007 13:56
To: anyscript@yahoogroups.com
Subject: [AnyScript] Re: Anybody Gait Model
Hey Søren
Thanks for your previous reply.
I did as you said, and had a look at the JointsAndDriver.any file,
but the markers which I need to change, these being p4 & p11 (right
and left tibial tubercle) and p6 & p13 (right and left greater
trochanter) don’t seem to be present in this file. Does that mean
that these are not used in driving the model? Are they merely used
for defining the model at the start?
I would like to replace these four markers with their equivalent in
the Helen Hayes marker set, i.e. replace p4 & p11 with tibial wands,
and p6 & p13 with femoral wands. Since they’re not present in the
JointsAndDriver.any file does that mean I would not have to make any
changes in that file?
Look forward to hearing from you.
Heena
— In anyscript@yahoogrou <mailto:anyscript%40yahoogroups.com> ps.com,
“AnyBody Support” <support@…>
wrote:
>
> Hi Heena
>
>
>
> Welcome to the group
>
>
>
> I am afraid that this is a complex question which is difficult to
answer in
> detail.
>
>
>
> First of all it is important to understand the way the current
model relies
> on selecting and driving individual dof from each marker and is
measuring in
> the local coordinate system of the segments, not the global ref
system. I
> think the way to shift the marker set, is to identify equivalent
markers in
> the Helen Hayes marker set, that “resembles” the markers from Kit
Vaughan.
> By “resembles” I mean that marker can be used for driving the same
dof in
> the model. So as example find a knee marker in the Helen Hayes
markerset
> and replace it with a knee marker in the current gait model and so
on. So
> you need to do multiple changes in the JointAndDriver.any file to
shift the
> markerset.
>
>
>
> There is a webcast “GaitModeling” about the gait model please see
> http://www.anybodyt <http://www.anybodytech.com/199.0.html>
ech.com/199.0.html this will give you more
information
> about how the model is driven and the concept behind (you need to
log into
> the user area of www.anybodytech.com
<http://www.anybodyt <http://www.anybodytech.com/> ech.com/> to see
> this, it is free)
>
>
>
> The GaitModel is not the simplest one in terms of kinematics, if
you have
> not done so, I would recommend to go through the tutorials.
Especially the
> one about the mechanical elements
http://www.anybodyt <http://www.anybodytech.com/675.0.html>
ech.com/675.0.html
>
>
>
> I hope this helps you move on, otherwise please write again.
>
>
>
> Best regards
>
> Søren, AnyBody support
>
>
>
> _____
>
> From: anyscript@yahoogrou <mailto:anyscript%40yahoogroups.com> ps.com
[mailto:anyscript@yahoogrou <mailto:anyscript%40yahoogroups.com> ps.com]
On Behalf
> Of sann2392
> Sent: 12 November 2007 13:20
> To: anyscript@yahoogrou <mailto:anyscript%40yahoogroups.com> ps.com
> Subject: [AnyScript] Anybody Gait Model
>
>
>
> Hi,
>
> I’m working with the anybody gait model, and would like to change
the
> marker set from the current Kit Vaughan marker set, to the Helen
Hayes
> Vicon VCM (Roy Davis) marker set.
>
> What changes would I have to make in the Anyscript files?
>
> I would also like to know how exactly the markers are used to
define
> bone structure and drive the model.
>
> I look forward to hearing from you.
>
> Heena
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
[Non-text portions of this message have been removed]