Line metrics.

TextMesh Pro sets line metrics automatically when you generate a font Asset.

If the generated values produce strange or incorrect results, you can tweak the line metrics settings to fine-tune the font.

Most line metric values are relative to the Baseline, which is the horizontal line that characters sit on.

Values for above-the-baseline metrics, such as the Ascender height, are greater that the Baseline value.
Values for below-the-baseline metrics, such as the Descender height, are less than Baseline value.

Metric:	Function:
Line Height	The distance between the tops of consecutive lines. If you set the line height to a value greater than the combined size of the Ascender and Descender, it creates a gap between lines. If you set a line height to a value less than the combined size of the ascender and descender results in potential overlap between characters on different lines.
Ascender	The ascender height, which specifies how far characters can extend above the baseline. It corresponds to the top of a line.
Cap Height	The height of capital letters from the baseline.
Baseline	The baseline height. The baseline is the horizontal line that characters sit on.
Descender	The descender height, which specifies how far characters can extend below the baseline.
Underline Offset	The position of underlines relative to the baseline.
Strikethrough Offset	The position of strikethrough lines relative to the baseline.
Superscript/ Subscript Offset	Adjust the baseline for superscript and subscript text.
Super/ Subscript Size	The scale of superscript and subscript text relative to the normal font size.
Padding	The amount of padding between characters in the font atlas texture. TextMesh Pro sets this value when you generate the font Asset. It is not editable.
Width/Height	The font atlas texture's width and height, in pixels. TextMesh Pro sets these values when you generate the font Asset. They are not editable.