TM Facility

When using BimViewer, some walls don't show in the Viewer (but that works fine in the Xeokit SDK Viewer). [geometry.zip](https://github.com/xeokit/xeokit-bim-viewer/files/7072133/geometry.zip) Here is attached geometry.xkt (generated by @xeokit/xeokit-ifc-to-xkt from ifc file...

I've experienced some issues when using this library for developping a proxy via Web Api .NET Core 2.2 : Autodesk.Viewing.endpoint.setEndpointAndApi(`${EnpointApiUrl}/api/forge`, 'modelDerivativeV2'); Hope thoses issues will be fixed in next release....