unityzgy/Assets/Scripts/GameObjectCtrl/Text3DCtrl.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Text3DCtrl : MonoBehaviour
{
    public TextMesh textMesh;
    public LookAtState LookAtState = LookAtState.LookAt;
    Transform targetTrans;
    float angleX;

    public void SetLayer(string LayerName)
    {
        this.gameObject.layer = LayerMask.NameToLayer(LayerName);
    }

    public void SetLookTarget(Transform transform)
    {
        targetTrans = transform;
        angleX = this.transform.localEulerAngles.x;
    }

    public void SetTextSize(float size)
    {
        if (size != 0)
            textMesh.characterSize = size;
    }

    // Update is called once per frame
    void Update()
    {
        if (targetTrans&&transform.gameObject.activeSelf)
        {
            transform.LookAt(transform.position + targetTrans.rotation * Vector3.forward,
                  targetTrans.rotation * Vector3.up);
            if (LookAtState == LookAtState.LookAtKeepX)//保持X轴 只旋转Y轴
            {
                Vector3 eulerAngles = this.transform.localEulerAngles;
                eulerAngles.x = 0;
                eulerAngles.z = 0;
                this.transform.localEulerAngles = eulerAngles;
            }
        }
        //this.transform.eulerAngles += new Vector3(0,180,0);
    }

    public void SetName(string text)
    {
        textMesh.text = text;
    }

    //选选取的时候 改变文字颜色
    public void ChangeTextColor(Color newColor)
    {
        textMesh.color = newColor;
    }
}

public enum LookAtState
{
    //看向目标
    LookAt,

    //看向目标 同时保持X轴
    LookAtKeepX,
}