写一段unity的描边shader
时间: 2023-09-13 17:07:26 浏览: 54
以下是一段简单的Unity描边Shader代码:
```
Shader "Custom/Outline" {
Properties {
_Color ("Color", Color) = (1,1,1,1)
_Thickness ("Thickness", Float) = 0.01
}
SubShader {
Tags {"Queue"="Geometry" "RenderType"="Opaque"}
Pass {
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma geometry geom
struct appdata {
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
};
struct v2f {
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
};
v2f vert (appdata v) {
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = v.uv;
return o;
}
sampler2D _MainTex;
float4 _MainTex_ST;
float4 frag (v2f i) : SV_Target {
return tex2D(_MainTex, i.uv);
}
[maxvertexcount(3)]
void geom(triangle v2f IN[3], inout TriangleStream<v2f> stream) {
v2f v0 = IN[0];
v2f v1 = IN[1];
v2f v2 = IN[2];
float3 p0 = v0.vertex.xyz;
float3 p1 = v1.vertex.xyz;
float3 p2 = v2.vertex.xyz;
float3 e0 = p1 - p0;
float3 e1 = p2 - p0;
float3 n = cross(e0, e1);
n = normalize(n);
float3 side0 = n * _Thickness;
float3 side1 = n * _Thickness;
float3 side2 = n * _Thickness;
v0.vertex.xyz += side0;
v1.vertex.xyz += side1;
v2.vertex.xyz += side2;
stream.Append(v0);
stream.Append(v1);
stream.Append(v2);
v0.vertex.xyz -= side0 * 2;
v1.vertex.xyz -= side1 * 2;
v2.vertex.xyz -= side2 * 2;
stream.Append(v0);
stream.Append(v1);
stream.Append(v2);
}
ENDCG
}
}
FallBack "Diffuse"
}
```
这段Shader使用了几何Shader来实现描边效果,通过计算每个三
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