【Shader】边缘发光效果的两种写法

来源：互联网发布：jade 知乎编辑：程序博客网时间：2024/05/19 02:05

我们可以看到很多游戏经常会有这种模型边缘发光的效果，看起来很高大上的样子。其实实现起来挺简单的，网上也有很多这样的例子分享，现在我也来分享一下两种Shader实现的代码吧。

1.Surface Shader

Shader "Custom/Rim Light" {       Properties {              _MainTex("Base (RGB)", 2D) = "white" {}              _RimColor("_RimColor", Color) =(0.17,0.36,0.81,0.0)              _RimWidth("_RimWidth", Range(0.6,9.0)) = 0.9       }        SubShader {              Tags{ "RenderType" = "Opaque"}  LOD 150              CGPROGRAM               #pragma surface surf Lambert                           struct Input {                     float2 uv_MainTex;                     float3 viewDir;              };               sampler2D _MainTex;              fixed4 _RimColor;              fixed _RimWidth;               void surf (Input IN, inout SurfaceOutput o) { fixed4 t = tex2D (_MainTex, IN.uv_MainTex);                     o.Albedo = t.rgb; o.Alpha = t.a;                     half rim = 1.0 - saturate(dot (normalize(IN.viewDir), o.Normal));                     o.Emission= _RimColor.rgb * pow (rim, _RimWidth);              }              ENDCG       }        Fallback "Diffuse"}

主要是这两句起到关键作用。

half rim = 1.0 - saturate(dot (normalize(IN.viewDir), o.Normal));o.Emission= _RimColor.rgb * pow (rim, _RimWidth);

如果不想受灯光影响，可以在Tags加上"LightMode"="Always"

2.Vetex and Fragment Shader

Shader "Custom/Rim Light VF" {    Properties {        _MainTex ("Base (RGB)", 2D) = "white" {}        _Color ("Main Color", Color) = (1,1,1,1)        _RimColor ("Rim Color", Color) = (1, 1, 1, 1)        _RimWidth ("Rim Width", float) = 0.9    }    SubShader {        Pass {       Lighting Off            CGPROGRAM                #pragma vertex vert                #pragma fragment frag                #include "UnityCG.cginc"                struct appdata                 {                    float4 vertex : POSITION;                    float3 normal : NORMAL;                    float2 texcoord : TEXCOORD0;                };                struct v2f                 {                    float4 pos : SV_POSITION;                    float2 uv : TEXCOORD0;                    fixed3 color : COLOR;                };                uniform float4 _MainTex_ST;                uniform fixed4 _RimColor;                float _RimWidth;                v2f vert (appdata_base v) {                    v2f o;                    o.pos = mul (UNITY_MATRIX_MVP, v.vertex);                    float3 viewDir = normalize(ObjSpaceViewDir(v.vertex));                    float dotProduct = 1 - dot(v.normal, viewDir);                                       o.color = smoothstep(1 - _RimWidth, 1.0, dotProduct);                    o.color *= _RimColor;                    o.uv = v.texcoord.xy;                    return o;                }                uniform sampler2D _MainTex;                uniform fixed4 _Color;                fixed4 frag(v2f i) : COLOR {                    fixed4 texcol = tex2D(_MainTex, i.uv);                    texcol *= _Color;                    texcol.rgb += i.color;                    return texcol;                }            ENDCG        }    }}

当然最关键的还是vert方法里的代码，具体两种方法大家可以根据需求使用。看看效果，赶紧试试吧。

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