Transform point from DWG model coordinates to autodesk forge viewer coordinates (new WGS.LmvMatrix4 undefined) - autodesk-forge

Question

I am trying to display a point on model displayed in the Autodesk forge viewer. However I am unable to figure out how to transform the point. I found the next question that seems to resolve this question:
Transform point from DWG model coordinates to autodesk forge viewer coordinates
When I try to use the function of this question:
var vpXform = viewer.model.getPageToModelTransform(viewportId).clone();
var invVpXform = new WGS.LmvMatrix4(true);
invVpXform.getInverse(vpXform, true);
var ptInCadX = ...;
var ptInCadY = ...;
var verticesInViewer = new THREE.Vector3().set(ptInCadX, ptInCadY, 0).applyMatrix4(invVpXform);
It shows the next error: Uncaught ReferenceError: WGS is not defined
And if I try it without the WGS.LmvMatrix4, it shows the following error: Uncaught ReferenceError: new LmvMatrix4 is not defined
I'm using the latest version of the Forge Viewer, v7.Can someone help me finding what am I doing wrong?
Thank you very much.

Answer 1

Here's an updated version of the snippet:
// Start by getting a list of all viewports in your model
let viewports = viewer.model.getData().viewports;
// Choose a viewport you want to use for the design-to-viewer coordinate mapping (it must include a `transform` property);
// in my case I'll just pick the first one
let viewport = viewports[0];
// Load the viewport transform into a three.js matrix
let xform = new THREE.Matrix4().fromArray(viewport.transform);
// Compute the inverse transxform
let inverse = new THREE.Matrix4().getInverse(xform, true);
// Use the inverse transform to convert design coordinates to paper coordinates
let someX = 0, someY = 0;
let viewerCoords = new THREE.Vector3().set(someX, someY, 0).applyMatrix4(inverse);