[Autodesk Forge viewer]如何获取指定图层中对象的dbIds

Question

我有一个从2d DWG 翻译的SVF 文件并成功加载到Viewer 中。

现在我想查询图层中某些对象的属性/属性。

这是我到目前为止所做的：

let layer = viewer.model.getLayersRoot().children.find(x=> x.name==='Marker');//find the layer named by 'Marker'----{name: "Marker", index: 72, id: 71, isLayer: true}
let objectTree = viewer.model.getData().instanceTree;//get the Object Tree and its One-dimensional array of dbIdList
// stuck here
// looking for some method like objectTree.getIdListInLayer(layerId)

---

欢迎提出任何建议。

Answer 1

很遗憾，目前可能无法执行此操作。请参考这篇文章：

How to get a list of dbids contained in a layer?

Answer 2

根据Eason Kang的回答，没有官方方法可以实现这一点。所以剩下的唯一方法就是迭代 dbIdList。代码如下：

function query(dbId, model, layerName) {
    if (!dbId) return Promise.resolve(null);
    return new Promise(resolve => {
        model.getProperties(dbId, x => {
            let layerProp = x.properties.find(x => x.displayName === 'Layer' && x.displayValue === layerName);
            resolve(!!layerProp ? x : null);
        });
    });
}

Promise.all(Object.keys(objectTree.nodeAccess.dbIdToIndex).map(dbId => query(dbId = dbId - 0, viewer.model, layerName = 'Marker')))
    .then(function(resultList) {
        resultList = resultList.filter(x => !!x);
        console.table(resultList); //this is all the objects in the Marker layer
    });