Использующийся размер шрифта (для динамических шрифтов).
If this is set to a non-zero value, the font size specified in the font importer is overriden with a custom size. This is only supported for fonts set to use dynamic font rendering. Other fonts will always use the default font size.
using UnityEngine;
public class Example : MonoBehaviour { void Start() { GetComponent<TextMesh>().fontSize = 12; } }