[SOLVED] Export the state of a specified node

Hi,

First of all, I am aware that similar questions have been answered… Unfortunately, I am still struggling ;(

What I am trying to do is to obtain the position values of one single node and plot a graph of displacement vs time. With the WriteState function, I have managed to export the positions of 10450 nodes which is the total number of vertex on my mesh, but it is too difficult to read so I am wondering if there is a convenient way to output the state of one point at every timestep.

#Export info
        pneu.createObject('WriteState', filename=path+'/data/pneu.data', writeX='true', writeX0='false',writeV='false', DOFsX='1')

I have read the post which seems like a solution: https://www.sofa-framework.org/community/forum/topic/get-the-position-value-from-a-mechanicalobject-point-in-python/

And added these lines to my controller:

    def onEndAnimationStep(self, dt):
        #access the 'position' state vector
        myMOpositions = self.myMechanicalObjectPointer.findData('position').value
        # print the position value of the DOF 5793
        print str(t)
        print str(myMOpositions[5783][0])+' '+str(myMOpositions[5783][1])+' '+str(myMOpositions[5783][2])
        return 0

However, I have no idea of where to find the outputs in the default user interface. Can anyone give some suggestions?

Many thanks,
Owen