同学你好，可以参考一下：

https://www.likecs.com/ask-4264740.html

https://www.freesion.com/article/34811041315/

http://t.zoukankan.com/guxin-p-unity-floating-a-object-on-water.html

https://blog.csdn.net/sinat_34014668/article/details/127355826

https://blog.csdn.net/weixin_43673589/article/details/123463124