3D残影Shader

前段时间有人说想要个残影的代码

今天给大家分享下这个是效果

下面几张是不同透明度的

好了上菜吧

Shader "Phantom" {
    Properties {
        _normalMap ("normal map", 2D) = "bump" {} //法线贴图
        _rimColor ("Rim Color", Color) = (1, 1, 1, 1)//颜色
        _power ("power", Float) = 1//明暗程度
    }
    SubShader {
        Tags 
        { 
            "RenderType"="Transparent" 
            "LightMode"="ForwardBase"
            "Queue"="Transparent"
        }
 
        LOD 200
 
        Pass {
            Name "ForwardBase"
 
            Tags {
                "LightMode"="ForwardBase"
            }
 
            Blend SrcAlpha OneMinusSrcAlpha
            //Blend SrcAlpha One
 
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            //#define UNITY_PASS_FORWARDBASE
            #include "UnityCG.cginc"
            #include "AutoLight.cginc"
            //#pragma multi_compile_fwdbase_fullshadows
            //#pragma exclude_renderers xbox360 ps3 flash d3d11_9x 
            //#pragma target 3.0
 
            uniform sampler2D _normalMap; uniform float4 _normalMap_ST;
            uniform float4 _rimColor;
            uniform float _power;
 
            struct VertexInput {
                float4 vertex : POSITION;
                float3 normal : NORMAL;
                float4 tangent : TANGENT;
                float2 texcoord0 : TEXCOORD0;
            };
 
            struct VertexOutput {
                float4 pos : SV_POSITION;
                float2 uv0 : TEXCOORD0;
                float4 posWorld : TEXCOORD1;
                float3 normalDir : TEXCOORD2;
                float3 tangentDir : TEXCOORD3;
                float3 binormalDir : TEXCOORD4;
                float3 eyeDir : TEXCOORD5;
                LIGHTING_COORDS(10,11)
            };
 
            VertexOutput vert (VertexInput v) {
                VertexOutput o;
                o.uv0 = v.texcoord0;
                o.normalDir = mul(float4(v.normal,0), _World2Object).xyz;
                o.tangentDir = normalize( mul( _Object2World, float4( v.tangent.xyz, 0.0 ) ).xyz );
                o.binormalDir = normalize(cross(o.normalDir, o.tangentDir) * v.tangent.w);
                o.posWorld = mul(_Object2World, v.vertex);
                o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
 
                // Eye direction vector
                o.eyeDir.xyz = normalize( _WorldSpaceCameraPos.xyz - mul( _Object2World, v.vertex )).xyz;
 
                TRANSFER_VERTEX_TO_FRAGMENT(o)
                return o;
            }
 
            float4 frag(VertexOutput i) : COLOR 
            {
                float3x3 tangentTransform = float3x3( i.tangentDir, i.binormalDir, i.normalDir);
                float3 viewDirection = normalize(_WorldSpaceCameraPos.xyz - i.posWorld.xyz);
/////// Normals:
                float2 node_64 = i.uv0;
                float3 normalLocal = UnpackNormal(tex2D(_normalMap,TRANSFORM_TEX(node_64.rg, _normalMap))).rgb;
                float3 normalDirection =  normalize(mul( normalLocal, tangentTransform )); // Perturbed normals
                float3 lightDirection = normalize(_WorldSpaceLightPos0.xyz);
                float3 halfDirection = normalize(viewDirection + lightDirection);
////// Fallout:
                float normalDotEye = 1 - dot( normalDirection, i.eyeDir.xyz );
                float4 retColor = float4(_rimColor.r, _rimColor.g, _rimColor.b, _rimColor.a * pow(normalDotEye, _power));
                return retColor;
            }
            ENDCG
        }
    }
    FallBack "Diffuse"
}![](/upload/201510/12/201510122324391263.jpg) 

只要拖入一张角色的法线贴图就OK了