using UnityEngine;

using System.Collections;

public class WaterSin : MonoBehaviour {

    GameObject gameobject1;

    MeshFilter meshFlider;

    MeshRenderer meshRender;

    public Material material;

    private float totalHeight;

// Use this for initialization

    void Start()

    {

        //Create Mesh

        gameobject1 = new GameObject("Mesh");

        meshFlider = gameobject1.AddComponent<MeshFilter>();

        meshRender = gameobject1.AddComponent<MeshRenderer>();

        meshRender.material = material;

        meshFlider.mesh = new Mesh();

        Vector3[] veritices = new Vector3[20];

        Vector3[] normal = new Vector3[20];

        Vector2[] uv = new Vector2[20];

        int[] triangles = new int[18 * 3];

        for (int i = 0; i < 10; i++)

        {

            veritices[i] = new Vector3(i - 5, 0, 0);

            veritices[i + 10] = new Vector3(i - 5, 1, 0);

            uv[i] = new Vector2(0.1f * i, 0);

            uv[i+10] = new Vector2(0.1f * i, 1);

            normal[i] = new Vector3(0, 1, 0);

            normal[i + 10] = new Vector3(0, 1, 0);

        }

        for (int i = 0; i < 9; i++)

        {

            triangles[i * 3] = i;

            triangles[i * 3 + 1] = i + 10;

            triangles[i * 3 + 2] = i + 1;

            triangles[(i + 9) * 3] = i + 10;

            triangles[(i + 9) * 3 + 1] = i + 11;

            triangles[(i + 9) * 3 + 2] = i + 1;

        }

        meshFlider.mesh.vertices = veritices;

        meshFlider.mesh.triangles = triangles;

        meshFlider.mesh.uv = uv;

        meshFlider.mesh.normals = normal;

        meshFlider.mesh.RecalculateBounds();

    }

         

// Update is called once per frame

void Update () {

        MeshWave();

}

    void MeshWave()

    {

        Vector3[] vertices = meshFlider.mesh.vertices;

        Vector2[] uv = meshFlider.mesh.uv;

        for (int i = 10; i < 20; i++)

        {

            float meshHeight = totalHeight+0.3f*Mathf.Sin(0.5f*vertices[i].x + Time.time * 4.0f);

            vertices[i] = new Vector3(vertices[i].x, meshHeight, 0);

            uv[i] = new Vector2(uv[i].x, meshHeight / 11);

        }

        meshFlider.mesh.vertices = vertices;

        meshFlider.mesh.uv = uv;

    }

    void OnGUI()

    {

        totalHeight = GUI.HorizontalScrollbar(new Rect(25, 25, 100, 30), totalHeight, 1.0F, 0.0F, 10.0F);

    }

}