轮廓描边效果

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想利用Unity3D中shader这个功能实现描边轮廓边框效果该怎么做呢，相信有很多搞开发的人想知道，为此下面就给大家介绍下方法。

　　Shade实现描边效果，如下图中的3D球效果图

Shade代码如下：

Shader "Outlined/Silhouetted Diffuse" { Properties { _Color ("Main Color", Color) = (1,1,1,1) _OutlineColor ("Outline Color", Color) = (0,0,0,1) //改变这个能改变轮廓边的颜色 _Outline ("Outline width", Range (0.0, 0.03)) = 0.008 //改变这个能改变轮廓边的粗细 _MainTex ("Base (RGB)", 2D) = "white" { } } CGINCLUDE#include "UnityCG.cginc"struct appdata { float4 vertex : POSITION; float3 normal : NORMAL;};struct v2f { float4 pos : POSITION; float4 color : COLOR;};uniform float _Outline;uniform float4 _OutlineColor;v2f vert(appdata v) { // just make a copy of incoming vertex data but scaled according to normal direction v2f o; o.pos = mul(UNITY_MATRIX_MVP, v.vertex); float3 norm   = mul ((float3x3)UNITY_MATRIX_IT_MV, v.normal); float2 offset = TransformViewToProjection(norm.xy); o.pos.xy += offset * o.pos.z * _Outline; o.color = _OutlineColor; return o;}ENDCG SubShader { Tags { "Queue" = "Transparent" } // note that a vertex shader is specified here but its using the one above Pass { Name "OUTLINE" Tags { "LightMode" = "Always" } Cull Off ZWrite Off ZTest Always ColorMask RGB // alpha not used // you can choose what kind of blending mode you want for the outline Blend SrcAlpha OneMinusSrcAlpha // Normal //Blend One One // Additive //Blend One OneMinusDstColor // Soft Additive //Blend DstColor Zero // Multiplicative //Blend DstColor SrcColor // 2x MultiplicativeCGPROGRAM#pragma vertex vert#pragma fragment fraghalf4 frag(v2f i) :COLOR { return i.color;}ENDCG } Pass { Name "BASE" ZWrite On ZTest LEqual Blend SrcAlpha OneMinusSrcAlpha Material { Diffuse [_Color] Ambient [_Color] } Lighting On SetTexture [_MainTex] { ConstantColor [_Color] Combine texture * constant } SetTexture [_MainTex] { Combine previous * primary DOUBLE } } }  SubShader { Tags { "Queue" = "Transparent" } Pass { Name "OUTLINE" Tags { "LightMode" = "Always" } Cull Front ZWrite Off ZTest Always ColorMask RGB // you can choose what kind of blending mode you want for the outline Blend SrcAlpha OneMinusSrcAlpha // Normal //Blend One One // Additive //Blend One OneMinusDstColor // Soft Additive //Blend DstColor Zero // Multiplicative //Blend DstColor SrcColor // 2x Multiplicative CGPROGRAM #pragma vertex vert #pragma exclude_renderers gles xbox360 ps3 ENDCG SetTexture [_MainTex] { combine primary } } Pass { Name "BASE" ZWrite On ZTest LEqual Blend SrcAlpha OneMinusSrcAlpha Material { Diffuse [_Color] Ambient [_Color] } Lighting On SetTexture [_MainTex] { ConstantColor [_Color] Combine texture * constant } SetTexture [_MainTex] { Combine previous * primary DOUBLE } } }  Fallback "Diffuse"}

　　以上就是Unity3D中利用shader这个功能实现描边轮廓边框效果的方法，不会的话就直接那这串代码去尝试吧。

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