An item for a MarkupPartText3d.
This class describes how to render one text item. The item may consist of several lines.
The horizontal orientation (in world coordinates) of the text.
The text will be drawn in this direction. The vector does not need to be normalized.
The up vector of the text to draw (in world coordinates).
This is the vertical (y) orientation of the text. The vector does not need to be normalized.
The height of the text (in world coordinate system) along the upVector.
This will control the size of the text. As the height of each character is unique, the given height is the height of the letter A.