async loadIfc(file, fitToFrame = false) {
            await this.IFC.loadIfc(file, fitToFrame);
        }
@deprecated Use `IfcViewerAPI.IFC.loadIfc()` instead.
Loads the given IFC in the current scene.
@file IFC as File.
@fitToFrame (optional) if true, brings the perspectiveCamera to the loaded IFC.