TextMesh.fontSize

Description

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;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Example() {
        GetComponent<TextMesh>().fontSize = 12;
    }
}