How to get the model object tree of 2D drawing

Question

I use viewer.getObjectTree = function(onSuccessCallback, onErrorCallback) to get the model object tree, then traverse from the root node down to all leaf nodes. Here is the code:

viewer.getObjectTree(function (objTree) {
    objTree.enumNodeChildren(
        objTree.getRootId(),
        function (dbId) {
            // Work with dbId
        },
        true
    );
};

However, it works only for 3D model. 2D model does not jump into the callback events. How can I get all object Ids of a 2D layout/drawing?

Answer 1

I found the reason. 2D layout/drawing does not have its model object tree (just layers). It uses different data structure with 3D model. 3D uses an instance tree to get all nodes, but 2D uses a string of DbIds.

To navigate objects in 3D model, use viewer.getObjectTree and viewer.model.getData().instanceTree.

To navigate objects in 2D layout, use viewer.model.getData(). I can get a list of DbIds from viewer.model.getData().stringDbIds