Unlit shader isues

Shader "Unlit/shader"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
}
SubShader
{
Tags { "RenderType" = "Background" }
LOD 100
Pass
{
Blend One One
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
float3 normal : NORMAL;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
float3 worldNormal : TEXCOORD1;
};
sampler2D _MainTex;
float4 _MainTex_ST;
v2f vert (appdata v)
{
v2f o;
o.worldNormal = UnityObjectToWorldNormal(v.normal);
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = TRANSFORM_TEX(v.uv, _MainTex);
return o;
}
fixed4 frag(v2f i) : SV_Target
{
float3 camVec = float3(1, 0, 0);
float cosa = dot(-camVec, normalize(i.worldNormal));
float depth = (1 - cosa) * abs(sin(i.uv.y * 100));
fixed4 col = float4(0, depth, depth * 0.25, 0);
return col;
}
ENDCG
}
}
}
i have 3 questions
1. how do i get worldpos/vertex positions in world
2. how do i get camera position
3. how to fix transparency
please help
please help

 

If you're asking questions with code, format your code properly. You're also asking in a wrong forum.

Unity has a good set of tutorials on surface shaders, available here, read/work through them:
https://docs.unity3d.com/Manual/SL-SurfaceShaderExamples.html

List of builtin variables is available here:
https://docs.unity3d.com/Manual/SL-SurfaceShaderExamples.html

This is certainly incorrect, regardless of what you're trying to do: