Silhouette Edges

Unity Engine
1

Hi guys. I am trying to write a shader that will draw silhouette edges around my mesh. I have written the following code which in my mind should work however I am not getting the desired results. Basically, I want to see if the angle between verticies’ normal and the vector from the vertex to the camera is greater than 90 degrees. If it is, I want to treat that vertex like an edge. The following is my implementation.

CGPROGRAM
				#pragma vertex vert
				#pragma fragment frag
				#include "UnityCG.cginc"

				struct v2f
				{
					float4 position : POSITION;
					float3 color : COLOR0;
				};
		
				v2f vert(appdata_base v)
				{
					v2f o;
					
					o.position = mul(UNITY_MATRIX_MVP, v.vertex);
					
					float3 vecDistance = _WorldSpaceCameraPos - (mul(v.vertex, _Object2World));
					vecDistance = normalize(vecDistance);
					
					float3 vecWorldSpaceNormal = float3(mul(float4(v.normal, 1), _Object2World));
					
					float f = dot(vecDistance, vecWorldSpaceNormal);
					
					if(f < 0)
					{
						o.color = float3(0,0,0);
					}
					else
					{
						o.color = float3(1,1,1);
					}
					
			
					return o;
				}
		
				half4 frag(v2f i) : COLOR
				{
					return half4(i.color, 1);
				}

				ENDCG

It seems however that only the bottom half of my mesh is colored black. Any obvious ideas regarding what I may be doing wrong? Thanks!

2

It looks like your are in world space when you should be in view space.