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。
我已经将3D模型（IFC）上传到欧特克API，它已经被处理，我可以使用欧特克锻造3D查看器成功地可视化/导航模型。
我使用了同样的3D模型（IFC）在Nem schek SOLIBRI中创建了一个Topic，并使用BIM BCF 2.1标准导出了它（见https://github.com/buildingSMART/BCF-XML）。
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>
我尝试在Autodesk Forge 3D viewer上设置相同的摄影机/视图：
viewer.restoreState(JSON.parse(`{
"viewport": {
"eye": [2.803843040759871, 14.568845808384443, 0.8249055320631105],
"target": [0.4898262677194313, -0.8652456579090667, 0.1068652371988122],
"up": [-0.05264688190667085, 0.09299722978166312, 0.9942735142195238],
"projection": "perspective",
"isOrthographic": false,
"fieldOfView": 60.0
}
}`));
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。
也许SOLIBRI中的IFC模型和欧特克处理的IFC模型有不同的坐标系，或者错误是什么？
值不是Forge查看器的目标参数。你得用下面的公式自己算。
{目标}={相机视点}{相机方向}*{货币聚焦长度}
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！
