Silhouette shader - based on dot(N,V)

Unity Engine
1

I’m trying to achieve silhouette effect using the dot(N,V) equation, but my shader currently fails to draw the edges properly. Anyone see where the error could be located???

v2f vert(appdata v) {
	v2f o;
	
	float3 V = normalize(ObjSpaceViewDir(v.vertex));
	//float3 objSpaceCameraPos = mul(_World2Object, float4(_WorldSpaceCameraPos.xyz, 1)).xyz * unity_Scale.w;
	//float3 V = normalize(objSpaceCameraPos - v.vertex.xyz);
	float3 N = v.normal;
	
	o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
	o.color = _OutlineColor;
	o.edge = max(0, dot(V, N));
	
	return o;
}

half4 frag(v2f i) : COLOR 
{ 
	return i.edge;// < 0.05f ? 1 : 0;// * i.color; 
}
2

for smooth geo,the Dot(N,L) fall off smoothly,you can do some math trick,like pow(),for geo like cube, i dont think it can be done
Edit: and i think do that in fragment func will make it more smoothly

3

I’m not talking about the computation of the surface lighting - I assume L stands for light vector in your post

4

You probably want saturate(-dot(V,N)) ? Otherwise it’ll always come up black 'cause the view direction is facing away from your surface normal.

But doing that in the fragment shader with normalized vectors will give a smoother result. Also, if you want it constant sized, you’ll need to do something like;
-dot(V,N) / o.pos.w

Otherwise the effect increases and decreases as you get closerto /further from your object.

I’m guessing you’re after something like this;
http://forum.unity3d.com/threads/152561-Non-uniform-outline-shader

5

Yes this is exactly what I was asking for, Thanks a lot