async pickIfcItem(focusSelection = false, removePrevious = true) {
            const found = this.context.castRayIfc();
            if (!found)
                return null;
            const result = await this.selection.pick(found, focusSelection, removePrevious);
            if (result == null || result.modelID == null || result.id == null)
                return null;
            return result;
        }
Highlights the item pointed by the cursor and gets is properties.
@focusSelection If true, animate the perspectiveCamera to focus the current selection
@removePrevious whether to remove the previous subset