Hi, i'm not really much of a coder, i'm looking to add vertex alpha to the simple water shader that ships with unity. Anyone know of a way to do that? The texture and color alpha's already being used by the shader to generate the reflection, so it would seem the best option left is vertex alpha.

 `Shader "FX/Water (simple)" {
 Properties {
  _horizonColor ("Horizon color", COLOR)  = ( .172 , .463 , .435 , 0)
  _WaveScale ("Wave scale", Range (0.02,0.15)) = .07
  _ColorControl ("Reflective color (RGB) fresnel (A) ", 2D) = "" { }
  _ColorControlCube ("Reflective color cube (RGB) fresnel (A) ", Cube) = "" { TexGen CubeReflect }
  _BumpMap ("Waves Normalmap ", 2D) = "" { }
  WaveSpeed ("Wave speed (map1 x,y; map2 x,y)", Vector) = (19,9,-16,-7)
  _MainTex ("Fallback texture", 2D) = "" { }
 }
 
 CGINCLUDE
 // -----------------------------------------------------------
 // This section is included in all program sections below
 
 #include "UnityCG.cginc"
 
 uniform float4 _horizonColor;
 
 uniform float4 WaveSpeed;
 uniform float _WaveScale;
 uniform float4 _WaveOffset;
 
 struct appdata {
  float4 vertex : POSITION;
  float3 normal : NORMAL;
 };
 
 struct v2f {
  float4 pos : SV_POSITION;
  float2 bumpuv[2] : TEXCOORD0;
  float3 viewDir : TEXCOORD2;
 };
 
 v2f vert(appdata v)
 {
  v2f o;
  float4 s;
 
  o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
 
  // scroll bump waves
  float4 temp;
  temp.xyzw = v.vertex.xzxz * _WaveScale / unity_Scale.w + _WaveOffset;
  o.bumpuv[0] = temp.xy * float2(.4, .45);
  o.bumpuv[1] = temp.wz;
 
  // object space view direction
  o.viewDir.xzy = normalize( ObjSpaceViewDir(v.vertex) );
 
  return o;
 }
 
 ENDCG
  
 // -----------------------------------------------------------
 // Fragment program
 
 Subshader {
  Tags { "RenderType"="Opaque" }
  Pass {
 
 CGPROGRAM
 #pragma vertex vert
 #pragma fragment frag
 #pragma fragmentoption ARB_precision_hint_fastest 
 
 sampler2D _BumpMap;
 sampler2D _ColorControl;
 
 half4 frag( v2f i ) : COLOR
 {
  half3 bump1 = UnpackNormal(tex2D( _BumpMap, i.bumpuv[0] )).rgb;
  half3 bump2 = UnpackNormal(tex2D( _BumpMap, i.bumpuv[1] )).rgb;
  half3 bump = (bump1 + bump2) * 0.5;
  
  half fresnel = dot( i.viewDir, bump );
  half4 water = tex2D( _ColorControl, float2(fresnel,fresnel) );
  
  half4 col;
  col.rgb = lerp( water.rgb, _horizonColor.rgb, water.a );
  col.a = _horizonColor.a;
  return col;
 }
 ENDCG
  }
 }
 
 // -----------------------------------------------------------
 //  Old cards
 
 // three texture, cubemaps
 Subshader {
  Tags { "RenderType"="Opaque" }
  Pass {
  Color (0.5,0.5,0.5,0.5)
  SetTexture [_MainTex] {
  Matrix [_WaveMatrix]
  combine texture * primary
  }
  SetTexture [_MainTex] {
  Matrix [_WaveMatrix2]
  combine texture * primary + previous
  }
  SetTexture [_ColorControlCube] {
  combine texture +- previous, primary
  Matrix [_Reflection]
  }
  }
 }
 
 // dual texture, cubemaps
 Subshader {
  Tags { "RenderType"="Opaque" }
  Pass {
  Color (0.5,0.5,0.5,0.5)
  SetTexture [_MainTex] {
  Matrix [_WaveMatrix]
  combine texture
  }
  SetTexture [_ColorControlCube] {
  combine texture +- previous, primary
  Matrix [_Reflection]
  }
  }
 }
 
 // single texture
 Subshader {
  Tags { "RenderType"="Opaque" }
  Pass {
  Color (0.5,0.5,0.5,0)
  SetTexture [_MainTex] {
  Matrix [_WaveMatrix]
  combine texture, primary
  }
  }
 }
 
 }
 `