Version: 2018.2
public bool richText ;

説明

テキスト形式マークアップで HTML-style タグが使用可能になる。

Supported tags are:
<color="htmlcolor">colored text</color>, where "htmlcolor" is a html color string, like "#ff0000" or "red".
<b>bold text</b>
<i>italic text</i>
<size=20>sized text</size>
<material=1>render using custom material index</material>
<quad material=1 size=20 x=0.1 y=0.1 width=0.5 height=0.5/>, to render a single quad using the given material and UVs, used for embedding images in text.
These are only supported for fonts set to use dynamic font rendering, except for the 'color', 'material' and 'quad' tags.

using UnityEngine;

public class Example : MonoBehaviour { void Start() { GetComponent<TextMesh>().richText = true; } }