TextMesh wordwrap

I liked Hudi's answer so much I made it in to a reusable class. Just attach to any TextMesh, then set public properties:

UnwrappedText = Set this instead of TextMesh.Text.

MaxWidth = Max width you want to allow

NeedsLayout = Reset to true anytime you modify anything that requires a recalculation to be done (font size, UnwrappedText property, MaxWidth, etc)

ConvertNewLines = Just makes it so you can type \n in the Unity editor to get a new line character.

Edit: I added the BreakPartIfNeeded code because the original version wasn't breaking in the middle of a word if needed, and then it was also causing every word after that to cause a break because the mesh extents were too wide. You can bypass the BreakPartIfNeeded if you are positive you do not need, and you want the code to be more optimized.

 using UnityEngine;
 using System.Collections;
 
 [RequireComponent(typeof(TextMesh))]
 public class SmartTextMesh : MonoBehaviour
 {
     TextMesh TheMesh;
     public string UnwrappedText;
     public float MaxWidth;
     public bool NeedsLayout = true;
     public bool ConvertNewLines = false;
 
     void Start()
     {
         TheMesh = GetComponent<TextMesh>();
         if (ConvertNewLines)
             UnwrappedText = UnwrappedText.Replace("\\n", System.Environment.NewLine);
     }
 
     string BreakPartIfNeeded(string part)
     {
         string saveText = TheMesh.text;
         TheMesh.text = part;
         
         if (TheMesh.renderer.bounds.extents.x > MaxWidth)
         {
             string remaining = part;
             part = "";
             while (true)
             {
                 int len;
                 for (len = 2; len <= remaining.Length; len++)
                 {
                     TheMesh.text = remaining.Substring(0, len);
                     if (TheMesh.renderer.bounds.extents.x > MaxWidth)
                     {
                         len--;
                         break;
                     }
                 }
                 if (len >= remaining.Length)
                 {
                     part += remaining;
                     break;
                 }
                 part += remaining.Substring(0, len) + System.Environment.NewLine;
                 remaining = remaining.Substring(len);
             }
 
             part = part.TrimEnd();
         }
 
         TheMesh.text = saveText;
 
         return part;
     }
 
     void Update()
     {
         if (!NeedsLayout)
             return;
         NeedsLayout = false;
         if (MaxWidth == 0)
         {
             TheMesh.text = UnwrappedText;
             return;
         }
         string builder = "";
         string text = UnwrappedText;
         TheMesh.text = "";
         string[] parts = text.Split(' ');
         for (int i = 0; i < parts.Length; i++)
         {
             string part = BreakPartIfNeeded(parts[i]);
             TheMesh.text += part + " ";
             if (TheMesh.renderer.bounds.extents.x > MaxWidth)
             {
                 TheMesh.text = builder.TrimEnd() + System.Environment.NewLine + part + " ";
             }
             builder = TheMesh.text;
         }
     }
 }