Sprite shape animated water volume

SpriteWaterShape.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.U2D;

[ExecuteInEditMode]
public class SpriteWaterShape : MonoBehaviour
{
    public SpriteShapeController controller;
    
    [Space]

    [Header("Volume")]
    [Tooltip("Distance between spline points")]
    public float pointDistance = 0.80f;
    public float width = 10f;
    public float height = 5f;

    [Space]
    
    [Header("Wave animation")]
    [Range(0f,1f)]
    public float waveHeight = 0.1f;
    public float waveFrequency = 0.3f;
    public float waveSpeed = 101f;
    
    private int pointCount;
    private float t;
    private float sine;
    private Vector3 pointPosition;
    
    private void OnValidate()
    {
        Rebuild();
    }

    public void Rebuild()
    {
        if (!controller) return;

        pointDistance = Mathf.Max(pointDistance, 0.15f);
        width = Mathf.Max(width, 0.5f);
        pointCount = Mathf.CeilToInt(width/pointDistance);
        
        controller.spline.Clear();
        
        //Bottom left
        controller.spline.InsertPointAt(0, new Vector3(-(width*0.5f), -height*0.5f, 0f));
        
        for (int i = 0; i <= pointCount; i++)
        {
            //Normalized distance from left to right (0-1 value)
            t = (float)i / (float)pointCount;

            //Insert point along the top of the 'rectangle'
            controller.spline.InsertPointAt(i, new Vector3((t * width) - (width * 0.5f), height * 0.5f ,0f));

            //Corners
            if (i == 0 || i == pointCount)
            {
                controller.spline.SetTangentMode(i, ShapeTangentMode.Broken);
                
                //Top left
                if (i == 0)
                {
                    controller.spline.SetLeftTangent(i, Vector3.down);
                    controller.spline.SetRightTangent(i, Vector3.right * (pointDistance * 0.5f));
                }

                //Top right
                if (i == pointCount)
                {
                    controller.spline.SetLeftTangent(i, Vector3.left * (pointDistance * 0.5f));
                    controller.spline.SetRightTangent(i, Vector3.down);
                }
            }
            else
            {
                controller.spline.SetTangentMode(i, ShapeTangentMode.Continuous);
                
                //Place tangents flat and half way towards next/previous point (smooth sine curve)
                controller.spline.SetLeftTangent(i, Vector3.left * (pointDistance * 0.5f));
                controller.spline.SetRightTangent(i, Vector3.right * (pointDistance * 0.5f));
            }
        }
        
        //Bottom right
        controller.spline.InsertPointAt(pointCount+1, new Vector3(width * 0.5f, -height*0.5f, 0f));
        
        controller.RefreshSpriteShape();
    }

    private void Update()
    {
        if (!controller) return;
        
        //Modify all points except the first and last (bottom corners)
        for (int i = 1; i <= pointCount-1; i++)
        {
            t = (float) i / pointCount;

            sine = Mathf.Sin((t * (width/waveFrequency)) + (Time.time * waveSpeed)) * waveHeight;
            
            pointPosition.x = (t * width) - (width * 0.5f); //Basically unchanged
            pointPosition.y = sine + (height * 0.5f);
            pointPosition.z = 0;
            
            controller.spline.SetPosition(i, pointPosition);
            
        }
    }
}