Autodesk : fitToView()在聚焦对象后以编程方式缩小

Question

在使用fitToView(objectIds，model)选择并聚焦对象之后，我想通过编程将相机放大，而不是通过鼠标事件。

我尝试了下面的代码，它能够放大，但是3D空间被扭曲了。如果你知道如何正确放大，请告诉我。

// select and isolate target object
let dbid = [1137]
viewer.impl.visibilityManager.isolate(dbid, viewer.model)
viewer.select(dbid)

//focus on target object
viewer.getAggregateSelection((data) => {
    let rootId = data.selector.getInstanceTree().nodeAccess.rootId
    viewer.fitToView(rootId, viewer.model)
})

//zoom out camera
let cam = viewer.getCamera().perspectiveCamera
cam.zoom *= 0.05
viewer.impl.syncCamera();

Answer 1

您需要更改的不是缩放属性，而是摄像机的位置：

var nav = viewer.navigation

var pos = nav.getPosition()

var target = nav.getTarget()

var viewdir = new THREE.Vector3()

viewdir.subVectors (pos, target).normalize()

// zooms out by 100 along the view direction
viewdir.multiplyScalar (100)

pos.add(viewdir)

nav.setPosition(pos)

Answer 2

您需要更改的不是缩放属性，而是设置摄像机位置：

let camera = this.viewer3D.getCamera();

viewer.fitToView(dbIds, null, true); //provide your device id to locate

var direction = new THREE.Vector3();

camera.getWorldDirection( direction );

//set distance move the camera forward to your needs (gives value in minus for zoomout)

camera.position.add( direction.multiplyScalar(-15)); 

let fov = viewer.navigation.getVerticalFov();  //or horizontalFov

viewer.navigation.setRequestTransition(true, camera.position,viewer.navigation.getTarget(), fov);

//if not work then try fov + 20,30,40 etc..