Autodesk forge 查看器 api v7.* 对齐多个 2d dwg 模型

Question

我在项目中使用 Autodesk Forge 查看器 v7.*。 在这个项目中，我必须展示从上传到 BIM360 的.dwg文件派生的多个 2d 模型。 我可以加载每个 model 并且它们彼此堆叠，但它们的 alignment 似乎完全错误。 我已经尝试了各种loadOptions ，还尝试过调整 model 的总转换，但他们的 alignment 仍然看起来很随机。 这是代码的一部分：

onDocumentLoaded = (doc, id, resolve, reject) => {
    // A document contains references to 3D and 2D geometries.
    let geometries = doc.getRoot().search({ 'type': 'geometry' })
    if (geometries.length === 0) {
      console.error('Document contains no geometries.')
      return
    }

    // Choose any of the avialable geometries
    let initGeom = geometries[0]


    let ops = {
      placementTransform: new window.THREE.Matrix4(),
      modelSpace: true,
      globalOffset: { x: 0, y: 0, z: 0 },
      applyRefPoint: true,
      isAEC: true, // to align the models,
    }

    // Load the chosen geometry
    let svfUrl = doc.getViewablePath(initGeom)
    this.viewerApp.loadModel(svfUrl, ops, (model) => this.onModelLoaded(model, id, resolve, reject), (error) => reject(error))
  }

如您所见，我尝试了一些加载选项，但在加载 2d 模型时它们似乎都无关紧要。 它们确实对 3d（.ifc、.rvt、.nwd）型号有影响。

我还尝试在加载 model 后更新转换：

transformModel = (viewer, model, transform) => {

    let translation = new window.THREE.Vector3();
    let rotation = new window.THREE.Quaternion();
    let scale = new window.THREE.Vector3();
    transform.decompose(translation, rotation, scale);

    function transformFragProxy(fragId) {

      var fragProxy = viewer.impl.getFragmentProxy(
        model,
        fragId);

      fragProxy.getAnimTransform();


      fragProxy.position = translation;

      fragProxy.scale = scale;

      fragProxy.quaternion._x = rotation.x;
      fragProxy.quaternion._y = rotation.y;
      fragProxy.quaternion._z = rotation.z;
      fragProxy.quaternion._w = rotation.w;

      fragProxy.updateAnimTransform();
    }

    var fragCount = model.getFragmentList().fragments.fragId2dbId.length;
    //fragIds range from 0 to fragCount-1
    for (var fragId = 0; fragId < fragCount; ++fragId) {

      transformFragProxy(fragId);
    }
  }

onModelLoaded = (model, id, resolve) => {

    if (!model.isLoadDone()) {
      // wait for loading complete, 2d models are not completely loaded even though onModelLoaded is called
      setTimeout(this.onModelLoaded, 0.1, model, id, resolve)
    } else {
      // done loading
      // force transformation
      this.transformModel(this.viewerApp, model, new window.THREE.Matrix4());
      this.viewerApp.impl.sceneUpdated(true);
      // .. rest op code here
    }

  }

Answer 1

如果所有其他方法都失败，请尝试使用placementTransform选项手动应用翻译：

const mat4 = new THREE.Matrix4()
mat4.makeTranslation(10,10,10)
//...
NOP_VIEWER.loadDocumentNode(document, geometry, {
   placementTransform: mat4, 
   keepCurrentModels: true
})