Help with Outline view dependent shader

Hey,

I'm trying to create a view dependent outline shader, where the outline appears if the camera looks straight at the item. If the camera is angled or if you look away the outline disappears. I want to do this all in the shader so I don't have to create a script that gives me the vectors.

Here is what I have so far, but it doesn't work correctly like when I orbit the object it is like it acts in world space.

Code (CSharp):

1.  
2.  
3. Shader "FantasticYes/Effect/Outline _ ITEM OUTLINE"
4. {
5.     Properties
6.     {
7.         [HDR]_TintColor("Tint Color",                    Color) = (0.5,0.5,0.5,0.5)
8.     }
9.  
10.         SubShader
11.     {
12.         Tags { "RenderType" = "Transparent" "Queue" = "Geometry"}
13.  
14.         Pass
15.         {
16.             ZTest Less
17.             ZWrite Off
18.             Blend One One
19.            
20.             CGPROGRAM
21.             #pragma vertex vert
22.             #pragma fragment frag
23.  
24.             #include "UnityCG.cginc"
25.            
26.  
27.             uniform half4 _TintColor;
28.  
29.             struct v2f
30.             {
31.                 float4 pos        : SV_POSITION;
32.                 float2 uv        : TEXCOORD0;
33.                 float3 color    : COLOR;
34.             };
35.             v2f vert (appdata_full v)
36.             {
37.                 v2f o;
38.                 o.pos = UnityObjectToClipPos(v.vertex);
39.  
40.  
41.                 float3 viewDir = normalize(UNITY_MATRIX_V[2].xyz);
42.                 float4 objectOrigin = unity_ObjectToWorld[3];
43.                 float3 normal = normalize(objectOrigin - _WorldSpaceCameraPos);
44.  
45.                 float dotProduct = 1 - dot(normal, viewDir);
46.                 o.color = smoothstep(1, 0.9, dotProduct);
47.                
48.                
49.                 return o;
50.             }
51.             fixed4 frag(v2f i) : SV_Target
52.             {
53.                 float4 col = _TintColor;
54.                 col.rgb *= i.color;
55.  
56.                 return col;
57.             }
58.             ENDCG
59.         }
60.     }
61. }
62.