TextMesh.fontStyle

Description

The font style to use (for dynamic fonts).

If this is set to a value other then normal, the font style set in the font importer is overriden with a custom style. This is only supported for fonts set to use dynamic font rendering. Other fonts will always render in normal style.

GetComponent.<TextMesh>().fontStyle = FontStyle.Bold;

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Example() {
        GetComponent<TextMesh>().fontStyle = FontStyle.Bold;
    }
}