Unity3D使用shader实现灰图

转载自：http://blog.csdn.net/cocos2der/article/category/1070771

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原文地址: http://www.cocos2dev.com/?p=596

昨晚看到群里问到2DSprite怎么变成灰白图，晚上看了下，修改shader是最方便的。

下面是Sprites-Gray.shader的实现，请放入自己工程：

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Shader "Sprites/Gray" { Properties {      [ PerRendererData ] _MainTex ( "Sprite Texture" , 2D ) = "white" { }      _Color ( "Tint" , Color ) = ( 1 , 1 , 1 , 1 )      [ MaterialToggle ] PixelSnap ( "Pixel snap" , Float ) = 0 }   SubShader {      Tags      {          "Queue" = "Transparent"          "IgnoreProjector" = "True"          "RenderType" = "Transparent"          "PreviewType" = "Plane"          "CanUseSpriteAtlas" = "True"      }        Cull Off      Lighting Off      ZWrite Off      Fog { Mode Off }      Blend One OneMinusSrcAlpha        Pass      {      CGPROGRAM          #pragma vertex vert          #pragma fragment frag          #pragma multi_compile DUMMY PIXELSNAP_ON          #include "UnityCG.cginc"            struct appdata_t          {              float4 vertex    : POSITION ;              float4 color      : COLOR ;              float2 texcoord : TEXCOORD0 ;          } ;            struct v2f          {              float4 vertex    : SV_POSITION ;              fixed4 color      : COLOR ;              half2 texcoord    : TEXCOORD0 ;          } ;            fixed4 _Color ;            v2f vert ( appdata_t IN )          {              v2f OUT ;              OUT . vertex = mul ( UNITY_MATRIX_MVP , IN . vertex ) ;              OUT . texcoord = IN . texcoord ;              OUT . color = IN . color * _Color ;              #ifdef PIXELSNAP_ON              OUT . vertex = UnityPixelSnap ( OUT . vertex ) ;              #endif                return OUT ;          }            sampler2D _MainTex ;            fixed4 frag ( v2f IN ) : SV_Target          {              fixed4 c = tex2D ( _MainTex , IN . texcoord ) * IN . color ;              c . rgb * = c . a ;              float gray = dot ( c . xyz , float3 ( 0.299 , 0.587 , 0.114 ) ) ;              c . xyz = float3 ( gray , gray , gray ) ;              return c ;          }      ENDCG      } } }

使用方法：

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// Use this for initialization void Start ( ) {      SpriteRenderer render = this . GetComponent < SpriteRenderer > ( ) ;      render . material . shader = Shader . Find ( "Sprites/Gray" ) ; }

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