Autodesk forge 如何从BIM BCF主题视点正确初始化Autodesk Forge 3D viewer？

我正在尝试根据BCF文件中的BIM主题可视化数据正确初始化Autodesk Forge 3D viewer

我已将三维模型（IFC）上载到Autodesk API，并已对其进行处理，我可以使用Autodesk Forge 3D viewer成功地可视化/导航模型

我在Nemetschek SOLIBRI中使用了相同的三维模型（IFC）来创建主题，并使用BIM BCF 2.1标准将其导出（请参阅）

VisualizationInfo中的XML数据：

<PerspectiveCamera>
  <CameraViewPoint>
      <X>2.803843040759871</X>
      <Y>14.568845808384443</Y>
      <Z>0.8249055320631105</Z>
  </CameraViewPoint>
  <CameraDirection>
      <X>0.4898262677194313</X>
      <Y>-0.8652456579090667</Y>
      <Z>0.1068652371988122</Z>
  </CameraDirection>
  <CameraUpVector>
      <X>-0.05264688190667085</X>
      <Y>0.09299722978166312</Y>
      <Z>0.9942735142195238</Z>
  </CameraUpVector>
  <FieldOfView>60.0</FieldOfView>
</PerspectiveCamera>

结果: Forge 3D viewer相机视图与SOLIBRI中的视图不匹配，也与BCF文件中保存为快照png的视图不匹配

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SOLIBRI中的IFC模型和Autodesk处理的IFC模型可能具有不同的坐标系，或者可能存在什么错误？

值不是Forge viewer的目标参数。你必须用下面的公式自己计算

{Target}={CameraViewPoint}+{camerradirection}*{CurrentFocalLength}

问题视图的完整摄影机映射将为：

var lengthScale = 1000; //! Use viwer.model.getUnitString(), the model I loaded is in `mm`, and BCF camera definition is in `m`
var eye = new THREE.Vector3( 2.803843040759871 * lengthScale, 14.568845808384443 * lengthScale, 0.8249055320631105 * lengthScale );
var sightVec = new THREE.Vector3( 0.4898262677194313, -0.8652456579090667,  0.1068652371988122 ).multiplyScalar( viewer.navigation.getFocalLength() );
var target = eye.clone().add( sightVec )
var up = new THREE.Vector3( -0.05264688190667085, 0.09299722978166312, 0.9942735142195238 );

//Since Forge Viewer will apply a global offset to the whole model
var offsetMatrix = viewer.model.getData().placementWithOffset;
var offsetEye = eye.applyMatrix4(offsetMatrix); 
var offsetTarget = target.applyMatrix4(offsetMatrix);
var fov = 60;

var cameraView = {
    aspect: viewer.getCamera().aspect,
    isPerspective: true,
    fov: fov,
    position: offsetEye,
    target: offsetTarget,
    up: up,
    orthoScale: 1
};

viwer.impl.setViewFromCamera( cameraView ); 

---

享受吧

谢谢，解决了。我建议您更新您的文档，没有提到

impl

或

setViewFromCamera

。我未能使用

setViewFromArray

获得相同的结果：文档确实过时了。但是，

impl

是一个私有对象，

setViewFromCamera

是Forge Viewer的私有API。因此，该文件中不会列出。

var lengthScale = 1000; //! Use viwer.model.getUnitString(), the model I loaded is in `mm`, and BCF camera definition is in `m`
var eye = new THREE.Vector3( 2.803843040759871 * lengthScale, 14.568845808384443 * lengthScale, 0.8249055320631105 * lengthScale );
var sightVec = new THREE.Vector3( 0.4898262677194313, -0.8652456579090667,  0.1068652371988122 ).multiplyScalar( viewer.navigation.getFocalLength() );
var target = eye.clone().add( sightVec )
var up = new THREE.Vector3( -0.05264688190667085, 0.09299722978166312, 0.9942735142195238 );

//Since Forge Viewer will apply a global offset to the whole model
var offsetMatrix = viewer.model.getData().placementWithOffset;
var offsetEye = eye.applyMatrix4(offsetMatrix); 
var offsetTarget = target.applyMatrix4(offsetMatrix);
var fov = 60;

var cameraView = {
    aspect: viewer.getCamera().aspect,
    isPerspective: true,
    fov: fov,
    position: offsetEye,
    target: offsetTarget,
    up: up,
    orthoScale: 1
};

viwer.impl.setViewFromCamera( cameraView );