[SOLVED] value assignment of mechanicalState in xml fiels

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  • 2 May 2017 at 07:05 #9025
    shang
    Blocked

    hi,everyone
    Does someone know that if we can assign the value of position like the case of array in xml files. For example, we can assign position = “0 0 0 0 0 0 1″, or the other case position=”@GeomagicDevice.positionDevice”, I want to assign position[0]= GeomagicDevice.positionDevice, and the rest elements of position be numerical values like position[1] = “0 0 0 0 0 0 1”,position[2] = “1 0 0 0 0 0 1”,position[3] = “2 0 0 0 0 0 1″position[4] = “3 0 0 0 0 0 1”, as a result, I want values of position to be “GeomagicDevice.positionDevice
    0 0 0 0 0 0 1
    1 0 0 0 0 0 1
    2 0 0 0 0 0 1
    3 0 0 0 0 0 1
    ”
    but I cannot find a solution how to achieve this. Does any one have an idea about this? Thank you !

    2 May 2017 at 18:28 #9034
    Hugo
    Keymaster

    Hi Xiaojuan,

    The data positionDevice of the class GeomagicDriver is not a vector of positions, but just a single Rigid coordinate. So all you can do is to manually define the data positionDevice with one rigid, for instance:

    
<GeomagicDriver positionDevice="0 0 0 0 0 0 1" />

    Cheers,

    Hugo

    2 May 2017 at 18:31 #9035
    Hugo
    Keymaster

    To answer your other question : how to define manually the vector of positions of the Mechanical Object.

    At my best knowledge, this is not feasible as you described in XML using

    
<MechanicalObject position[i] = ".." />

    Three solutions are available (taking the case of a Rigid-templated MechanicalObject):

    • give the position manually in the scene: 
      
<MechanicalObject template="Rigid" position="0 0 0 0 0 0 1
1 0 0 0 0 0 1
2 0 0 0 0 0 1
3 0 0 0 0 0 1" />
    • you can describe your position vector in an obj (e.g. “mesh.obj”) file like 
      
v 0 0 0 0 0 0 1
v 1 0 0 0 0 0 1
v 2 0 0 0 0 0 1
v 3 0 0 0 0 0 1

      and load this obj in SOFA, and assign these loaded positions:

      
<MeshObjLoader name="loadingFile" filename="mesh.obj" />
...
<MechanicalObject position="@loadingFile.position" />
    • or do it in Python using a PythonScriptController, see examples in the Python plugin.

    Does this help ?
    Cheers,

    Hugo

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