无法获取 instanceTree Autodesk

Question

我收到此错误：未捕获的 TypeError:> 无法读取未定义的属性“getRootId” 即使我正在使用 Autodesk.Viewing.GEOMETRY_LOADED_EVENT.. 仍然没有效果。

Answer 1

当你想访问instanceTree时，你只需要等待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

您不应该使用instanceTree 数据结构，而是使用受支持的功能/操作。如果您需要枚举叶节点，请尝试类似于described here：

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());
    });
}