Animated text, makes text mesh pro do the sine wave!

SineWaveTextAnimation.cs

using UnityEngine;
using TMPro;

public class SineWaveTextAnimation : MonoBehaviour
{
    public TMP_Text textMesh;
    public float frequency = 5.0f;
    public float amplitude = 5.0f;
    private TMP_TextInfo textInfo;
    private bool[] animateCharFlags;

    void Awake()
    {
        if (textMesh == null)
        {
            textMesh = GetComponent<TMP_Text>();
        }

        textInfo = textMesh.textInfo;
    }

    void Update()
    {
        textMesh.ForceMeshUpdate();
        textInfo = textMesh.textInfo;
        int characterCount = textInfo.characterCount;

        // Initialize or update our flags array
        if (animateCharFlags == null || animateCharFlags.Length < characterCount)
        {
            animateCharFlags = new bool[characterCount];
        }

        // Reset flags
        for (int i = 0; i < animateCharFlags.Length; i++) animateCharFlags[i] = false;

        // Custom logic to detect <wave> tags and set flags
        DetectWaveTags();

        if (characterCount == 0) return;

        for (int i = 0; i < characterCount; i++)
        {
            TMP_CharacterInfo charInfo = textInfo.characterInfo[i];
            if (!charInfo.isVisible) continue;

            // Check if this character is marked for animation
            if (!animateCharFlags[i]) continue;

            int materialIndex = charInfo.materialReferenceIndex;
            int vertexIndex = charInfo.vertexIndex;
            Vector3[] vertices = textInfo.meshInfo[materialIndex].vertices;

            float wave = Mathf.Sin(i + Time.time * frequency) * amplitude;

            for (int j = 0; j < 4; j++)
            {
                Vector3 offset = vertices[vertexIndex + j];
                offset.y += wave;
                vertices[vertexIndex + j] = offset;
            }
        }

        for (int i = 0; i < textInfo.meshInfo.Length; i++)
        {
            textInfo.meshInfo[i].mesh.vertices = textInfo.meshInfo[i].vertices;
            textMesh.UpdateGeometry(textInfo.meshInfo[i].mesh, i);
        }
    }
    private void DetectWaveTags()
    {
        // Initialize or reset the animateCharFlags array
        if (animateCharFlags == null || animateCharFlags.Length < textMesh.textInfo.characterCount)
        {
            animateCharFlags = new bool[textMesh.textInfo.characterCount];
        }
        for (int i = 0; i < animateCharFlags.Length; i++)
        {
            animateCharFlags[i] = false; // Reset the flag for each character
        }

        TMP_TextInfo textInfo = textMesh.textInfo;
        for (int i = 0; i < textInfo.linkCount; i++)
        {
            TMP_LinkInfo linkInfo = textInfo.linkInfo[i];
            // You can check linkInfo.GetLinkID() if you're looking for specific links
            for (int j = 0; j < linkInfo.linkTextLength; j++)
            {
                int characterIndex = linkInfo.linkTextfirstCharacterIndex + j;
                if (characterIndex < animateCharFlags.Length)
                {
                    animateCharFlags[characterIndex] = true; // Mark characters within links for animation
                }
            }
        }
    }

}