无法获取instanceTree autodesk

Question

我得到这个错误:未捕获的TypeError:>无法读取未定义的属性'getRootId‘，即使我使用Autodesk.Viewing.GEOMETRY_LOADED_EVENT..still也没有效果。

Answer 1

当您想访问instanceTree时，您只需等待Autodesk.Viewing.OBJECT_TREE_CREATED_EVENT被触发

viewer.addEventListener(Autodesk.Viewing.OBJECT_TREE_CREATED_EVENT, function () {

  var instanceTree = model.getData().instanceTree //cool
})

Answer 2

你不应该使用instanceTree数据结构，但函数/操作，这是受支持的方式。如果您需要枚举叶节点，请尝试类似于described here的方法

function getAllLeafComponents(viewer, callback) {
    var cbCount = 0; // count pending callbacks
    var components = []; // store the results
    var tree; // the instance tree

    function getLeafComponentsRec(parent) {
        cbCount++;
        if (tree.getChildCount(parent) != 0) {
            tree.enumNodeChildren(parent, function (children) {
                getLeafComponentsRec(children);
            }, false);
        } else {
            components.push(parent);
        }
        if (--cbCount == 0) callback(components);
    }
    viewer.getObjectTree(function (objectTree) {
        tree = objectTree;
        var allLeafComponents = getLeafComponentsRec(tree.getRootId());
    });
}