UnityのTextmeshProで文字を左からフェードして表示させるための奴

TextFadeEffecter.cs

using UnityEngine;
using TMPro;


namespace TMExtension
{

    // Function for TextmeshPro to fade text.
    public class TextFadeEffecter : MonoBehaviour
    {

        [Range(0, 1)]
        public float FadePercent = 0;

        int streamCount = 0;
        TMP_Text m_textMesh;

        protected void Reset()
        {
            m_textMesh = GetComponent<TMP_Text>();
        }

        protected void OnEnable()
        {
            m_textMesh = GetComponent<TMP_Text>();
        }
        
        protected void OnValidate()
        {

            var textMesh = GetComponent<TMP_Text>();
            if(textMesh != null)
            {
                Modify(textMesh);
            }
        }        

        private void Update()
        {
            if (m_textMesh == null) return;
            Modify(m_textMesh);
        }

        void Modify(TMP_Text textMesh)
        {
            var textInfo = textMesh.textInfo;
            
            if (textInfo == null || textInfo.characterCount == 0) return;

            streamCount = textInfo.characterCount;

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

                int materialIndex = charInfo.materialReferenceIndex;
                int vertexIndex = charInfo.vertexIndex;

                float f = i / (float)streamCount;

                float alpha = 1 - Mathf.Clamp01(f - (FadePercent * 2 - 1.0f));

                var col = charInfo.color;
                col.a = (byte)(col.a * alpha);

                var cols = textInfo.meshInfo[materialIndex].colors32;

                for (int k = 0; k < 4; ++k)
                {
                    cols[vertexIndex + k] = col;
                }
            }

            for(int i = 0; i < textInfo.materialCount; ++i)
            {
                if (textInfo.meshInfo[i].mesh == null) continue;

                textInfo.meshInfo[i].mesh.colors32 = textInfo.meshInfo[i].colors32;
                textMesh.UpdateGeometry(textInfo.meshInfo[i].mesh, i);

            }
        }
    }
}