How to access the "root" Scene Nodes graph

kng_ito

Hi,

I am trying to access some nodes in Scene Nodes graph with python.
For node-based objects like Nodes Modifier, I can use BaseList2D.GetNimbusRef() to access the graph, but I don't know how to get into the "root" Scene Nodes graph. Is there an invisible BaseList2D that holds the root Scene Nodes graph and I can use the same way from that object?

The code below is how I did it for node-based objects to access their nodes. I hope there is a way to access the root Scene Nodes graph in a similar way.

import maxon

def main():
    nbr = op.GetNimbusRef("net.maxon.neutron.nodespace")
    graph = nbr.GetGraph()
    root = graph.GetRoot()
    
    # Iterate over the direct children of the graph root.
    nodesList = []
    root.GetChildren(nodesList, maxon.NODE_KIND.NODE)
    for node in nodesList:
        print(node)
        
if __name__ == '__main__':
    main()

I would appreciate any examples or tips you could give me. Thank you.

ferdinand

Hey @kng_ito,

Thank you for reaching out to us. The "root" element of the document bound scene nodes graph is a scene hook. In case you are unfamiliar with that concept, SceneHookData is a plugin type of scene elements that are present by default in every scene. Scene hooks do not have any relation to scene nodes, it is just a coincidence that they both have the word "scene" in their name.

We have this C++ example for how to do it, and here I did the same in Python. There is also GraphDescription.CreateGraph which can be used to retrieve graphs for given items. E.g., when you pass it a BaseDocument, it will return the document bound scene nodes graph for you.

Cheers,
Ferdinand

kng_ito

Hi @ferdinand ,
Thanks as always for your clear answers, It solved the problem for me!