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Is it possible for a WPF control to have ActualWidth and ActualHeight if it has never been displayed?

I need Viewport3Dfor the sole purpose of performing geometric calculations using Petzold.Media3D.ViewportInfo. I would prefer not to post it in Windowor otherwise render it.

I am trying to accomplish this by instantiating Viewport3Dand setting multiple properties using the following C # method:

private Viewport3D CreateViewport(MainSettings settings)
{
    var cameraPosition = new Point3D(0, 0, settings.CameraHeight);
    var cameraLookDirection = new Vector3D(0, 0, -1);
    var cameraUpDirection = new Vector3D(0, 1, 0);
    var camera = new PerspectiveCamera
    {
        Position = cameraPosition,
        LookDirection = cameraLookDirection,
        UpDirection = cameraUpDirection
    };
    var viewport = new Viewport3D
    {
        Camera = camera,
        Width = settings.ViewportWidth,
        Height = settings.ViewportHeight
    };
    return viewport;
}

Later, I try to use this viewport to convert the location of the mouse to a three-dimensional location using this method:

public Point3D? Point2dToPoint3d(Point point)
{
    var range = new LineRange();
    var isValid = ViewportInfo.Point2DtoPoint3D(_viewport, point, out range);
    if (isValid)
        return range.PointFromZ(0);
    else
        return null;
}

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, WPF ActualWidth ActualHeight Width Height?

HorizontalAlignment VerticalAlignment Left Top , MinWidth MinHeight, ActualWidth ActualHeight.

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MSDN ActualWidth:

, . , , , , .

, , . Measure(Size), Arrange(Rect) . , .

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