Creating x-ray shader in Unity

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Custom/xrayMode" {
Properties{
_Color("_Color", Color) = (0,1,0,1)
_Inside("_Inside", Range(0,1)) = 0
_Rim("_Rim", Range(0,2)) = 1.2
}
SubShader{
Tags{ "Queue" = "Transparent" }
LOD 80

Pass{
Name "Darken"
Cull off
Zwrite off
Blend dstcolor zero

CGPROGRAM

#pragma vertex vert_surf
#pragma fragment frag_surf
#pragma fragmentoption ARB_precision_hint_fastest
//#pragma multi_compile_fwdbase

#include "HLSLSupport.cginc"
#include "UnityCG.cginc"


struct v2f_surf {
half4 pos : SV_POSITION;
fixed4 finalColor : COLOR;
};

uniform half4 _Color;
uniform half _Rim;
uniform half _Inside;

v2f_surf vert_surf(appdata_base v) {
v2f_surf o;

o.pos = UnityObjectToClipPos(v.vertex);
half3 uv = mul((float3x3)UNITY_MATRIX_IT_MV, v.normal);
uv = normalize(uv);
o.finalColor = lerp(half4(1,1,1,1),_Color,saturate(max(1 - pow(uv.z,_Rim),_Inside)));
return o;
}

fixed4 frag_surf(v2f_surf IN) : COLOR{

return IN.finalColor;
}

ENDCG
}

Pass{
Name "Lighten"
Cull off
Zwrite off
Blend oneminusdstcolor one

CGPROGRAM

#pragma vertex vert_surf
#pragma fragment frag_surf
#pragma fragmentoption ARB_precision_hint_fastest
//#pragma multi_compile_fwdbase

#include "HLSLSupport.cginc"
#include "UnityCG.cginc"


struct v2f_surf {
half4 pos : SV_POSITION;
fixed4 finalColor : COLOR;
};

uniform half4 _Color;
uniform half _Rim;
uniform half _Inside;

v2f_surf vert_surf(appdata_base v) {
v2f_surf o;

o.pos = UnityObjectToClipPos(v.vertex);
half3 uv = mul((float3x3)UNITY_MATRIX_IT_MV, v.normal);
uv = normalize(uv);
o.finalColor = lerp(half4(0,0,0,0),_Color,saturate(max(1 - pow(uv.z,_Rim),_Inside)));
return o;
}

fixed4 frag_surf(v2f_surf IN) : COLOR{

return IN.finalColor;
}

ENDCG
}
}

FallBack "Mobile/VertexLit"
}