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

Question

我有一个SVF文件，从2d DWG翻译过来并成功加载到Viewer中。

现在我想查询图层中某些对象的属性/属性。

以下是我迄今所做的：

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) 

---

任何建议表示赞赏。

Answer 1

不幸的是，目前可能无法做到这一点。请参考这个帖子：

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

Answer 2

据陈奕迅康的回答，没有达到这个没有正式的办法。所以剩下的唯一方法就是迭代dbIdList。下面是代码：

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 
    });