Vertex Modifier of Surface Shader

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【Vertex Modifier of Surface Shader】

Surface shader compilation directive vertex:functionName 可以用于指定顶点着色器。A function that takes inout appdata_full parameter.

Surface shader中顶点函数传出的坐标必须是Local坐标。在Vert执行完毕后，Surface shader会自动将此Local坐标乘以MVP矩阵。

Shader "Example/Normal Extrusion" {
Properties {
_MainTex ("Texture", 2D) = "white" {}
_Amount ("Extrusion Amount", Range(-,)) = 0.5
}
SubShader {
Tags { "RenderType" = "Opaque" }
CGPROGRAM
#pragma surface surf Lambert vertex:vert
struct Input {
float2 uv_MainTex;
};
float _Amount;
void vert (inout appdata_full v) {
v.vertex.xyz += v.normal * _Amount;
}
sampler2D _MainTex;
void surf (Input IN, inout SurfaceOutput o) {
o.Albedo = tex2D (_MainTex, IN.uv_MainTex).rgb;
}
ENDCG
}
Fallback "Diffuse"
}

如果想传递给surface自定义数据（per-pixel），顶点函数需要添加out Input 参数如下：

Shader "Example/Custom Vertex Data" {
Properties {
_MainTex ("Texture", 2D) = "white" {}
}
SubShader {
Tags { "RenderType" = "Opaque" }
CGPROGRAM
#pragma surface surf Lambert vertex:vert
struct Input {
float2 uv_MainTex;
float3 customColor;
};
void vert (inout appdata_full v, out Input o) {
UNITY_INITIALIZE_OUTPUT(Input,o);
o.customColor = abs(v.normal);
}
sampler2D _MainTex;
void surf (Input IN, inout SurfaceOutput o) {
o.Albedo = tex2D (_MainTex, IN.uv_MainTex).rgb;
o.Albedo *= IN.customColor;
}
ENDCG
}
Fallback "Diffuse"
}