TextBlockVisual3DSize Property

Gets or sets a Size of the 3D plane model that will show the text. When the Size is Empty (by default), the BorderSize will be used. If BorderSize is also Empty, then TextBlock will be measured and its desired size will be used. It is also possible to set only Size.Height and leave Size.Width 0 or NaN. In this case the used width will be calculated from BorderSize or TextBlock size. This way it is easy to specify only the desired text height in 3D space and the TextBlockVisual3D will automatically calculate the width of the model.

public Size Size { get; set; }