how to add PointKinematics analysis to FD

[Sina Porsa]

Hi every one.
I want to add an analysis (PointKinematics) to the forward dynamics. In other words, I want to run this analysis during forward dynamic.
I made some changes to the <ForwardTool> xml file.
I changed this:
.
.
<AnalysisSet name="Analyses">
<objects/>
<groups/>
</AnalysisSet>

with this:
.
.
<AnalysisSet name="Analyses">
<objects>
<PointKinematics name="PointKinematics">
<on> true </on>
<start_time> 0.000000000000000000 </start_time>
<end_time> 0.10000000000000000000 </end_time>
<step_interval> 1 </step_interval>
<in_degrees> true </in_degrees>
<body_name> calcn_r </body_name>
<relative_to_body_name> none </relative_to_body_name>
<point_name> NONAME </point_name>
<point> 0.01000000 -0.01000000 -0.02000000 </point>
</PointKinematics>
</objects>
<groups/>
</AnalysisSet>

when I want to run the modified version of the forwardtool, it ends up with this error:
" Runtime Error!
Program: C:\Program Files\OpenSim2.2.1\jdk\jre\bin\java.exe
This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information."

Any Idea?
Regards,
Sina

[Ayman Habib]

Hi Sina,

The attribute <relative_to_body_name> should be specified to an actual Body name (e.g. "ground") Please let me know if that solves your problem. Also please file a bug as we should give an informative error message rather than quietly crash if the body is not specified.

Please let me know how that goes.
-Ayman

[Sina Porsa]

Hi Ayman,
It did not solve the problem.
This is the new xml:
.
.
<in_degrees> true </in_degrees>
<body_name> calcn_r </body_name>
<relative_to_body_name> ground </relative_to_body_name>
<point_name> NONAME </point_name>
<point> 0.00000000000000000000 0.00000000000000000000 0.00000000000000000000 </point>
.
.
It crashes again,
Thanks,
Sina

[Ayman Habib]

Hi Sina,

Looking into the code I don't think that specifying a body name under <relative_to_body_name> is critical (ground is assumed otherwise). I used the following XML snippet to test in a ForwardTool setup file:
<AnalysisSet name="Analyses">
<objects>
...
<PointKinematics name="PointKinematics">
<on> true </on>
<start_time> 0.000000000000000000 </start_time>
<end_time> 1.0000000000000000000 </end_time>
<step_interval> 1 </step_interval>
<in_degrees> true </in_degrees>
<body_name> Pendulum </body_name>
<relative_to_body_name> NONE </relative_to_body_name>
<point_name> NONAME </point_name>
<point> 0.01000000 -0.01000000 -0.02000000 </point>
</PointKinematics>
..
</objects>
</AnalysisSet>

Could this be model specific, or could the crash be happening somewhere else?

Please let us know.

Best,
-Ayman

[Sina Porsa]

Hi Aymen,
The problem does not arise from the model (the Osim file).
I can run the regular FD tool to integrate state equations for this OSIM file. But when I add the "POINTKINEMATICS" it ends up to an error.
Is there anyway I can attach my xml and osim files here?
I have no idea what is the problem !!
Regards,
Sina

[Sina Porsa]

Hi Ayman
I just tried to run it on another computer and it ended up to the same error.
any idea?
Regards,
Sina

[Ayman Habib]

Hi Sina,

Please file a bug report and attach all the necessary files (in one zip) and I'll take a look and let you know.

Best,
-Ayman