Ripple Shader

//ripple effect on the y axis
//uses world space too :D
//by Cale Bradbury (@netgrind)
//use for whatever wherever whenever
Shader "Ripple Ring" {
    Properties {
        _MainTex("Texture", 2D) = "white"{}
        _x ("Freq-Phase-Amp-Speed",Vector) = (0,0,0,0)
    }
    Category{
	Blend SrcAlpha OneMinusSrcAlpha
	AlphaTest Greater 0.5
	Tags {"Queue"="AlphaTest"}
    SubShader {
        Pass {

            CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"
			float4 _x;
			sampler2D _MainTex;
			struct appdata {
				float4 vertex : SV_POSITION;
				float4 tex : TEXCOORD0;
			};
			struct v2f {
				float4 pos : SV_POSITION;
				float2 uv : TEXCOORD0;

			};

			v2f vert(appdata v) {
				v2f o;
				float4 vert = mul(_Object2World, v.vertex);
				float deg = atan2(vert.x, vert.z);
				float dis = length(vert.xz);
				dis += sin(vert.y*_x.x+_x.y+_Time.y*_x.w)*_x.z;
				v.vertex.xz = float2(sin(deg)*dis,cos(deg)*dis);
				o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
	            		o.uv = v.tex;
	            		return o;
			};
			half4 frag(v2f i) : COLOR {;
				return tex2D (_MainTex, i.uv);
			};


			ENDCG
        }
    }
    }
    Fallback "VertexLit"
}