Marker labelling about bioviz HOT 3 OPEN

Hi!
@jfslin

visualize the c3d file markers

For your first question, it is possible to show experimental markers, but only programmatically (I did not add the button yet) using the load_experimental_markers to which you can pass the path to a C3D file or the marker in a Pyomeca compatible format.

marker names, both of the ones on the model itself, as well as my c3d file?

It is unfortunately currently impossible to show the names of the markers

Also, is there a link to bioviz documentations somewhere? I didn't notice a link when i went through the readme page

Not really as it is more an interface than an actual library... We are planning to rewrite the core in C++ to make it faster..

I can see in the documentation that I can calculate the marker positions manually using biorbd.rigidbody.markers and calculate my RMSE, but just want to make sure that this isn't already being calculated - maybe the Kalman filter residual?

My first thought was what you just did, but you are right, I think the Kalman filter residual is equivalent, but probably squared (as it does not make sense to compute the square root while performing the algorithm

Hope this answers your questions!

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@pariterre thank you for the tips.

• 'load_experimental_markers` worked great
• I was able to get extract the marker positions from model.markers(q) and calculate the Euclidean distance manually

My remaining question: I was hoping for marker names so I can make sure the proper c3d marker is being associated to the model marker after performing Kalman IK. Are there any other features that might be possibly useful? Is there any way to draw a line between the model marker and the c3d marker? Or have them to be different colours?

Thank you.

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Hi @jfslin
There is currently no way to have separate colors for each markers, but it would be an relatively easy fix to make (if you follow the path of "marker_colors" you could see that you basically just have to replace the value by a list and slice the value with [].

For the marker names, it is possible to fetch them from model.markerNames(). Again, there is currently no way to print them on screen though..

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