外发光材质Shader

转载自  http://www.unitymanual.com/6943.html

游戏中我们经常会遇到需要制作外发光效果的地方，比如武器，比如坐骑要带一个牛掰的光晕。今天我找到了个好效果：

外发光材质Shader

001 Shader "Faye/OutLightting" 002 { 003 Properties 004 { 005 _MainTex("Texture (RGB)", 2D) = "black" {} 006 _Color("Color", Color) = (0, 0, 0, 1) 007 _AtmoColor("Atmosphere Color", Color) = (0.5, 0.5, 1.0, 1) 008 _Size("Size", Float) = 0.1 009 _Falloff("Falloff", Float) = 5 010 _FalloffPlanet("Falloff Planet", Float) = 5 011 _Transparency("Transparency", Float) = 15 012 _TransparencyPlanet("Transparency Planet", Float) = 1 013 } 014   015 SubShader 016 { 017 Pass 018 { 019 Name "PlanetBase" 020 Tags {"LightMode" = "Always"} 021 Cull Back 022   023 CGPROGRAM 024 #pragma vertex vert 025 #pragma fragment frag 026   027 #pragma fragmentoption ARB_fog_exp2 028 #pragma fragmentoption ARB_precision_hint_fastest 029   030 #include "UnityCG.cginc" 031   032 uniform sampler2D _MainTex; 033 uniform float4 _MainTex_ST; 034 uniform float4 _Color; 035 uniform float4 _AtmoColor; 036 uniform float _FalloffPlanet; 037 uniform float _TransparencyPlanet; 038   039 struct v2f 040 { 041 float4 pos : SV_POSITION; 042 float3 normal : TEXCOORD0; 043 float3 worldvertpos : TEXCOORD1; 044 float2 texcoord : TEXCOORD2; 045 }; 046   047 v2f vert(appdata_base v) 048 { 049 v2f o; 050   051 o.pos = mul (UNITY_MATRIX_MVP, v.vertex); 052 o.normal = v.normal; 053 o.worldvertpos = mul(_Object2World, v.vertex).xyz; 054 o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex); 055   056 return o; 057 } 058   059 float4 frag(v2f i) : COLOR 060 { 061 i.normal = normalize(i.normal); 062 float3 viewdir = normalize(_WorldSpaceCameraPos-i.worldvertpos); 063   064 float4 atmo = _AtmoColor; 065 atmo.a = pow(1.0-saturate(dot(viewdir, i.normal)), _FalloffPlanet); 066 atmo.a *= _TransparencyPlanet*_Color; 067 //Unity3D教程手册：http://www.unitymanual.com 068 float4 color = tex2D(_MainTex, i.texcoord)*_Color; 069 color.rgb = lerp(color.rgb, atmo.rgb, atmo.a); 070   071 return color*dot(normalize(i.worldvertpos-_WorldSpaceLightPos0), i.normal); 072 } 073 ENDCG 074 } 075   076 Pass 077 { 078 Name "AtmosphereBase" 079 Tags {"LightMode" = "Always"} 080 Cull Front 081 Blend SrcAlpha One 082   083 CGPROGRAM 084 #pragma vertex vert 085 #pragma fragment frag 086   087 #pragma fragmentoption ARB_fog_exp2 088 #pragma fragmentoption ARB_precision_hint_fastest 089   090 #include "UnityCG.cginc" 091   092 uniform float4 _Color; 093 uniform float4 _AtmoColor; 094 uniform float _Size; 095 uniform float _Falloff; 096 uniform float _Transparency; 097   098 struct v2f 099 { 100 float4 pos : SV_POSITION; 101 float3 normal : TEXCOORD0; 102 float3 worldvertpos : TEXCOORD1; 103 }; 104 //Unity3D教程手册：http://www.unitymanual.com 105 v2f vert(appdata_base v) 106 { 107 v2f o; 108   109 v.vertex.xyz += v.normal*_Size; 110 o.pos = mul (UNITY_MATRIX_MVP, v.vertex); 111 o.normal = v.normal; 112 o.worldvertpos = mul(_Object2World, v.vertex); 113   114 return o; 115 } 116   117 float4 frag(v2f i) : COLOR 118 { 119 i.normal = normalize(i.normal); 120 float3 viewdir = normalize(i.worldvertpos-_WorldSpaceCameraPos); 121   122 float4 color = _AtmoColor; 123 color.a = pow(saturate(dot(viewdir, i.normal)), _Falloff); 124 color.a *= _Transparency*_Color*dot(normalize(i.worldvertpos-_WorldSpaceLightPos0), i.normal); 125 return color; 126 } 127 ENDCG 128 } 129 } 130   131 FallBack "Diffuse" 132 }