OverlayManager错误。 未捕获的TypeError：无法读取未定义的属性'hasOwnProperty'

Question

I am trying to use the Overlay Manager for Autodesk Forge Viewer V7. When calling overlayManager.addScene('my_scene') I get the following error:

Uncaught TypeError: Cannot read property 'hasOwnProperty' of undefined.

It doesn't seem like overlayScenes is ever defined, but addScene calls this.impl.overlayscenes.hasOwnProperty

I created an extension and called the following code in the constructor of my extension:

function ClickableMarkup() {

    Autodesk.Viewing.Extension.call(this, viewer, options);
    let overlayManager = new 
    Autodesk.Viewing.OverlayManager();

    // Add scene -> Throws Error
    overlayManager.addScene('my_scene');

}

How do I fix this error?

Answer 1

Try pass the current Viewer's implementation object in to properly initialize the manager:

let overlayManager = new 
    Autodesk.Viewing.OverlayManager(viewer.impl);