Unity3D开发之在表面着色器shader中使用顶点着色器制造流光效果

先上流光效果。

世界坐标x值发生变化。当顶点世界坐标接近变化值时，将流光贴图的颜色值附加到附近的物体上。

首先，我们需要使用它shader添加模型位置vertex:Myvert 后面的名字是顶点着色器函数的名字

#pragma surface surf Lambert alpha:fade keepalpha noshadow vertex:Myvert

然后编写顶点着色器片段。世界坐标添加到结构体中。

        struct Input   {    float2 uv_texcoord;    float3 worldSpacePos;   };         void Myvert(inout appdata_full v, out Input i)         {             UNITY_INITIALIZE_OUTPUT(Input, i);             i.worldSpacePos = mul(unity_ObjectToWorld, v.vertex);         }

然后你可以在表面着色器片段中编写你的需求。

整体代码如下：

Shader "Map-base" {  Properties  {   _Color("_Color", Color) = (0,0,0,1)   _Normal("Normal", 2D) = "white" {}   [HDR]_linecolor("line-color", Color) = (0,0,0,0)   _linemap("line-map", 2D) = "white" {}   [HideInInspector] _texcoord( "", 2D ) = "white" {}   [HideInInspector] __dirty( "", Int ) = 1   _FlowX("_FlowX",float)=0   _FlowTex("_FlowTex",2D)="white" {}   _FlowWidth("_FlowWidth",Range(0.01,1))=1  }   SubShader  {   Tags{ "RenderType" = "Transparent"  "Queue" = "Transparent 100" "IgnoreProjector" = "True" "IsEmissive" = "true"  }   Cull Back   CGPROGRAM   #include "UnityStandardUtils.cginc"   #pragma target 3.0   #pragma surface surf Lambert alpha:fade keepalpha noshadow vertex:Myvert   struct Input   {    float2 uv_texcoord;    float3 worldSpacePos;   };    uniform sampler2D _Normal;   uniform float4 _Normal_ST;   uniform float4 _Color;   uniform float4 _linecolor;   uniform sampler2D _linemap;   uniform float4 _linemap_ST;   uniform float _FlowX;   uniform sampler2D _FlowTex;   uniform float _FlowWidth;      void Myvert(inout appdata_full v, out Input i)         {             UNITY_INITIALIZE_OUTPUT(Input, i);             i.worldSpacePos = mul(unity_ObjectToWorld, v.vertex);         }    void surf( Input i , inout SurfaceOutput o )   {    float2 uv_Normal = i.uv_texcoord * _Normal_ST.xy   _Normal_ST.zw;    o.Normal = UnpackScaleNormal( tex2D( _Normal, uv_Normal ), 2.0 );    float2 uv_linemap = i.uv_texcoord * _linemap_ST.xy   _linemap_ST.zw;    o.Emission = ( _linecolor * tex2D( _linemap, uv_linemap ).a ).rgb;    float d1=i.worldSpacePos.x-_FlowX;    fixed4 c=fixed四、0、0、0、1)；    if(abs(d1)>_FlowWidth/2)     c=fixed4(0,0,0,1);    else c=tex2D(_FlowTex, fixed2(0.5 d1/_FlowWidth,1));    o.Albedo = _Color.rgb c.rgb;    o.Alpha = _Color.a*c.a;   }    ENDCG  }  CustomEditor "ASEMaterialInspector" }