[SOLVED] sofa+python

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  • This topic has 2 replies, 3 voices, and was last updated 9 years ago by Hugo.
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  • 2 November 2015 at 18:49 #3910
    lionel
    Blocked

    Hi,
    I have some issues combining sofa and python.

    I have a python script which adds new objects (named A1, A2,…) in my scene with a keyboard event.
    A need to dynamically link a Data from these new objects (for instance, Vec3 positions) with an object already in the scene (named B).

    I don’t know how to do it.
    I tried to retrieve a vector of positions from B as a numpy array and add the new positions from Ai to it. But it did not work.

    Has someone an idea ?

    lionel

    4 November 2015 at 09:15 #3917
    max
    Blocked

    Hello Lionel,

    The position vector is copied when accessed from python, so you need to copy it back for the changes to happen. When using numpy arrays, you also need to convert it to a python list first using .tolist(). Here is a short example:


    import numpy as np

    def createScene(node):

    # create some dofs
    dofs = node.createObject('MechanicalObject', template = 'Vec3')

    # positions are copied
    pos = dofs.position

    # modification
    pos[0][0] = 1

    # debug
    print 'before:', dofs.position

    # commit changes
    dofs.position = pos

    # debug
    print 'after:', dofs.position

    # numpy array
    pos = np.zeros( (10, 3) )
    dofs.position = pos.tolist()

    print 'numpy:', dofs.position

    Hope this helps.

    Best,

    max.

    edit: we really need a preview system for posts + unescaped code characters

    10 December 2015 at 09:29 #4846
    Hugo
    Keymaster

    Thank you for your reply Max.
    This helped (I confirmed it !)

    Cheers,

    Hugo

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