Combine smoothness and metallic with frag Shader - unity3d

Question

I'm trying to add some Smoothness and Metallic to my custom shader in order to have dark texture for day/night cycle.
For the moment, i have a procedurale planet and my shader draw different textures based on height (distance between center of planet and vertex at surface).
Until there, it works !
Now I really need to add Smoothness and Metallic to material but with my shader the textures of my procedurale planet is black and dont know why ? I have a pass for frag and then a surf function for smoothness and metallic. Why this doesn't work please ?
However when I look at the material icon and I change value it looks nice but procedurale planet is always black no matter of value i change and the color i set.
Can't solve this problem since too long time. Please need some help.
Thanks in advance.
Here is my shader :
Shader "Custom/Planet" {
Properties {
_Color ("Color", Color) = (1,1,1,1)
_MainTex ("Albedo (RGB)", 2D) = "white" {}
_Tex0 ("Tex 0", 2D) = "white" {}
_Tex1 ("Tex 1", 2D) = "white" {}
_Tex2 ("Tex 2", 2D) = "white" {}
_Tex3 ("Tex 3", 2D) = "white" {}
_Tex4 ("Tex 4", 2D) = "white" {}
_Blend0to1and1to2 ("Blend between 0 and 1, 1 and 2", Vector) = (0,1,2,3)
_Blend2to3and3to4 ("Blend between 2 and 3, 3 and 4", Vector) = (0,1,2,3)
_Glossiness ("Smoothness", Range(0,1)) = 0.5
_Metallic ("Metallic", Range(0,1)) = 0.0
}
SubShader {
Tags { "RenderType"="Opaque" }
LOD 200
Pass
{
Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
#pragma target 3.0
sampler2D _Tex0;
sampler2D _Tex1;
sampler2D _Tex2;
sampler2D _Tex3;
sampler2D _Tex4;
float4 _Blend0to1and1to2;
float4 _Blend2to3and3to4;
uniform float4 _Tex0_ST;
uniform float4 _Tex1_ST;
uniform float4 _Tex2_ST;
uniform float4 _Tex3_ST;
struct appData {
float4 vertex : POSITION;
float2 uv1 : TEXCOORD0;
float2 uv2 : TEXCOORD1;
float2 uv3 : TEXCOORD2;
float2 uv4 : TEXCOORD3;
};
struct v2f {
float4 pos : SV_POSITION;
float2 uv1 : TEXCOORD0;
float2 uv2 : TEXCOORD1;
float2 uv3 : TEXCOORD2;
float2 uv4 : TEXCOORD3;
float4 col : COLOR;
};
#define PI 3.141592653589793
inline float2 RadialCoords(float3 a_coords)
{
float3 a_coords_n = normalize(a_coords);
float lon = atan2(a_coords_n.z, a_coords_n.x);
float lat = acos(a_coords_n.y);
float2 sphereCoords = float2(lon, lat) * (1.0 / PI);
return float2(sphereCoords.x * 0.5 + 0.5, 1 - sphereCoords.y);
}
v2f vert (appData vInput) {
v2f output;
output.pos = UnityObjectToClipPos (vInput.vertex);
output.uv1 = TRANSFORM_TEX(vInput.uv1, _Tex0);
output.uv2 = TRANSFORM_TEX(vInput.uv2, _Tex1);
output.uv3 = TRANSFORM_TEX(vInput.uv3, _Tex2);
output.uv4 = TRANSFORM_TEX(vInput.uv4, _Tex3);
output.col = length(vInput.vertex);
return output;
}
half4 frag (v2f fInput) : COLOR {
half4 c0 = tex2D (_Tex0, fInput.uv1);
half4 c1 = tex2D (_Tex1, fInput.uv2);
half4 c2 = tex2D (_Tex2, fInput.uv3);
half4 c3 = tex2D (_Tex3, fInput.uv4);
half4 c4 = tex2D (_Tex4, fInput.uv1);
if (fInput.col.x < _Blend0to1and1to2.x) {
return c0;
}
if (fInput.col.x > _Blend0to1and1to2.x && fInput.col.x < _Blend0to1and1to2.y) {
return lerp(c0,c1,((fInput.col.x - _Blend0to1and1to2.x)/(_Blend0to1and1to2.y-_Blend0to1and1to2.x)));
}
if (fInput.col.x > _Blend0to1and1to2.y && fInput.col.x < _Blend0to1and1to2.z) {
return c1;
}
if (fInput.col.x > _Blend0to1and1to2.z && fInput.col.x < _Blend0to1and1to2.w) {
return lerp(c1,c2,((fInput.col.x - _Blend0to1and1to2.z)/(_Blend0to1and1to2.w-_Blend0to1and1to2.z)));
}
if (fInput.col.x > _Blend0to1and1to2.w && fInput.col.x < _Blend2to3and3to4.x) {
return c2;
}
if (fInput.col.x > _Blend2to3and3to4.x && fInput.col.x < _Blend2to3and3to4.y) {
return lerp(c2,c3,((fInput.col.x - _Blend2to3and3to4.x)/(_Blend2to3and3to4.y-_Blend2to3and3to4.x)));
}
if (fInput.col.x > _Blend2to3and3to4.y && fInput.col.x < _Blend2to3and3to4.z) {
return c3;
}
if (fInput.col.x > _Blend2to3and3to4.z && fInput.col.x < _Blend2to3and3to4.w) {
return lerp(c3,c4,((fInput.col.x - _Blend2to3and3to4.z)/(_Blend2to3and3to4.w-_Blend2to3and3to4.z)));
}
return c4;
}
ENDCG
}
CGPROGRAM
// Physically based Standard lighting model, and enable shadows on all light types
#pragma surface surf Standard fullforwardshadows
// Use shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0
sampler2D _Tex1;
struct Input {
float2 uv_MainTex;
};
half _Glossiness;
half _Metallic;
fixed4 _Color;
void surf (Input IN, inout SurfaceOutputStandard o) {
// Albedo comes from a texture tinted by color
fixed4 c = tex2D (_Tex1, IN.uv_MainTex) * _Color;
o.Albedo = c.rgb;
// Metallic and smoothness come from slider variables
o.Metallic = _Metallic;
o.Smoothness = _Glossiness;
o.Alpha = c.a;
}
ENDCG
}
FallBack "Diffuse"
}