To sum my opinion about shaders, I'd say they are as hard as they are rewarding.
Today, for the game we are currently developing, I had to go back to the shaders, but also, I had to learn a lot from the shader system Unity offers.
It's really good, but it's really confusing. Plus, the tutorials don't have a clear starting point, nor a clear end.
I found nearly the exact shader I needed here, but I wanted to learn today.
So, With the help of the shader showed above, I created a pass that draws a colored overlay Silhouette of the character.
Shader "Player/Silhouette" {
Properties
{
_MainTex ("Base (RGB)", 2D) = "white" {}
_BumpMap ("Normalmap", 2D) = "bump" {}
_SilhouetteColor ("Silhouette Color", Color) = (1,1,1,1)
}
SubShader {
Tags { "LightMode"="Always" "Queue" = "Transparent" }
LOD 250
//code dessinant la silhouette
Pass
{
Name "SILHOUETTE"
ZTest Greater
Offset 0 , -3000
cull back
ZWrite off
CGPROGRAM
#pragma fragment frag
#pragma vertex vert
#include "UnityCG.cginc"
float4 _SilhouetteColor;
struct v2f {
float4 pos : SV_POSITION;
};
v2f vert (appdata_base v)
{
v2f o;
o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
return o;
}
half4 frag (v2f i) : COLOR
{
return _SilhouetteColor;
}
ENDCG
}
}
FallBack "Mobile/Diffuse"
}
To use it, add
usepass "Player/Silhouette/SILHOUETTE"Before your shader, and add the property :
_SilhouetteColor ("Silhouette Color", Color) = (1,1,1,1)
And there you have it.
How it works
It's simple, really, yet I'm not sure I did it the right way.
It draws the silhouette whenever an object is overlapping (using the ZBuffer to determinate this) with a threshold of 3000 units.
Also, it doesn't change the Z-Buffer.
Hope It'll help !
