Unity 如何动态修改不规则模型贴图上的字

主要思路： 利用RenderTexture

效果：

场景 添加一个 渲染RenderTeture的摄像机 添加一个画布（背景、字体）

资源 新建RenderTexture 新建一个材质 材质引用贴图RenderTexture

修改Text的值 材质贴到模型上 此时已经能直接看到效果了

如何保存？

    public string str;
	public RenderTexture m_RenderTexture;
	private void _SaveRenderTexture(RenderTexture renderTexture)
	{
		RenderTexture active = RenderTexture.active;
		RenderTexture.active = renderTexture;
		Texture2D outImage = new Texture2D(renderTexture.width, renderTexture.height, 
		TextureFormat.ARGB32, false);
		outImage.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
		outImage.Apply();
		RenderTexture.active = active;
		byte[] bytes = outImage.EncodeToPNG();
		string path = string.Format("Assets/MyImg/{0}.png", str);
		FileStream fileStream = File.Open(path, FileMode.Create);
		BinaryWriter writer = new BinaryWriter(fileStream);
		writer.Write(bytes);
		writer.Flush();
		writer.Close();
		fileStream.Close();
		Destroy(outImage);
		outImage = null;
		Debug.Log("保存成功！" + path);
	}