Unity liquid shader

Liquid.shader

/*Please do support www.bitshiftprogrammer.com by joining the facebook page : fb.com/BitshiftProgrammer
Legal Stuff:
This code is free to use no restrictions but attribution would be appreciated.
Any damage caused either partly or completly due to usage this stuff is not my responsibility*/
Shader "BitshiftProgrammer/Liquid"
{
    Properties
    {
		_Colour ("Colour", Color) = (1,1,1,1)
        _FillAmount ("Fill Amount", Range(-10,10)) = 0.0
		[HideInInspector] _WobbleX ("WobbleX", Range(-1,1)) = 0.0
		[HideInInspector] _WobbleZ ("WobbleZ", Range(-1,1)) = 0.0
        _TopColor ("Top Color", Color) = (1,1,1,1)
		_FoamColor ("Foam Line Color", Color) = (1,1,1,1)
        _Rim ("Foam Line Width", Range(0,0.1)) = 0.0
		_RimColor ("Rim Color", Color) = (1,1,1,1)
	    _RimPower ("Rim Power", Range(0,10)) = 0.0
    }
 
    SubShader
    {
        Tags {"Queue"="Geometry"  "DisableBatching" = "True" }
  
        Pass
        {
		 Zwrite On
		 Cull Off // we want the front and back faces
		 AlphaToMask On // transparency
         CGPROGRAM
         #pragma vertex vert
         #pragma fragment frag
         #include "UnityCG.cginc"
 
         struct appdata
         {
           float4 vertex : POSITION;
		   float3 normal : NORMAL;
         };
 
         struct v2f
         {
            float4 vertex : SV_POSITION;
			float3 viewDir : COLOR;
		    float3 normal : COLOR2;
			float fillEdge : TEXCOORD2;
         };
 
         float _FillAmount, _WobbleX, _WobbleZ;
         float4 _TopColor, _RimColor, _FoamColor, _Colour;
         float _Rim, _RimPower;
           
		 float4 RotateAroundYInDegrees (float4 vertex, float degrees)
         {
			float alpha = degrees * UNITY_PI / 180;
			float sina, cosa;
			sincos(alpha, sina, cosa);
			float2x2 m = float2x2(cosa, sina, -sina, cosa);
			return float4(vertex.yz , mul(m, vertex.xz)).xzyw ;
         }

         v2f vert (appdata v)
         {
            v2f o;
            o.vertex = UnityObjectToClipPos(v.vertex);
            float3 worldPos = mul (unity_ObjectToWorld, v.vertex.xyz);
			// rotate it around XY
			float3 worldPosX= RotateAroundYInDegrees(float4(worldPos,0),360);
			// rotate around XZ
			float3 worldPosZ = float3 (worldPosX.y, worldPosX.z, worldPosX.x);
			// combine rotations with worldPos, based on sine wave from script
			float3 worldPosAdjusted = worldPos + (worldPosX  * _WobbleX)+ (worldPosZ* _WobbleZ); 
			// how high up the liquid is
			o.fillEdge =  worldPosAdjusted.y + _FillAmount;
			o.viewDir = normalize(ObjSpaceViewDir(v.vertex));
            o.normal = v.normal;
            return o;
         }

         fixed4 frag (v2f i, fixed facing : VFACE) : SV_Target
         {
		   // rim light
		   float dotProduct = 1 - pow(dot(i.normal, i.viewDir), _RimPower);
           float4 RimResult = smoothstep(0.5, 1.0, dotProduct);
           RimResult *= _RimColor;
		   // foam edge
		   float4 foam = ( step(i.fillEdge, 0.5) - step(i.fillEdge, (0.5 - _Rim)));
           float4 foamColored = foam * (_FoamColor * 0.75);
		   // rest of the liquid
		   float4 result = step(i.fillEdge, 0.5) - foam;
           float4 resultColored = result * _Colour;
		   // both together
           float4 finalResult = resultColored + foamColored;
		   finalResult.rgb += RimResult;
		   // color of backfaces/ top
		   float4 topColor = _TopColor * (foam + result);
		   //VFACE returns positive for front facing, negative for backfacing
		   return facing > 0 ? finalResult : topColor;
         }
         ENDCG
        }
    }
}

Wobble.cs

/*Please do support www.bitshiftprogrammer.com by joining the facebook page : fb.com/BitshiftProgrammer
Legal Stuff:
This code is free to use no restrictions but attribution would be appreciated.
Any damage caused either partly or completly due to usage this stuff is not my responsibility*/
using UnityEngine;

public class Wobble : MonoBehaviour
{
    public float MaxWobble = 0.03f;
    public float WobbleSpeed = 5.0f;
    public float RecoveryRate = 1f;

    Renderer rend;
    Vector3 prevPos;
    Vector3 prevRot;
    float wobbleAmountToAddX;
    float wobbleAmountToAddZ;

    void Start()
    {
        rend = GetComponent<Renderer>();
    }

    private void Update()
    {
        // decreases the wobble over time
        wobbleAmountToAddX = Mathf.Lerp(wobbleAmountToAddX, 0, Time.deltaTime * RecoveryRate);
        wobbleAmountToAddZ = Mathf.Lerp(wobbleAmountToAddZ, 0, Time.deltaTime * RecoveryRate);

        // make a sine wave of the decreasing wobble
        float wobbleAmountX = wobbleAmountToAddX * Mathf.Sin(WobbleSpeed * Time.time);
        float wobbleAmountZ = wobbleAmountToAddZ * Mathf.Sin(WobbleSpeed * Time.time);

        // send it to the shader
        rend.material.SetFloat("_WobbleX", wobbleAmountX);
        rend.material.SetFloat("_WobbleZ", wobbleAmountZ);

        // Move Speed
        Vector3 moveSpeed = (prevPos - transform.position) / Time.deltaTime;
        Vector3 rotationDelta = transform.rotation.eulerAngles - prevRot;

        // add clamped speed to wobble
        wobbleAmountToAddX += Mathf.Clamp((moveSpeed.x + (rotationDelta.z * 0.2f)) * MaxWobble, -MaxWobble, MaxWobble);
        wobbleAmountToAddZ += Mathf.Clamp((moveSpeed.z + (rotationDelta.x * 0.2f)) * MaxWobble, -MaxWobble, MaxWobble);

        // save the last position
        prevPos = transform.position;
        prevRot = transform.rotation.eulerAngles;
    }
}