Unity shader护盾特效

身为小白的我看到某大神用 amplify shader editor 插件做了护盾特效，很酷。

蓝色是大神做的，红色那个是我的（感觉和大神的低了几个档次，哈哈）

大神的视频链接：

https://www.bilibili.com/video/av28959957/?share_source=qq&ts=1535869157&share_medium=iphone&bbid=137b0753063d77d57eeb03598dd9e194

大神上传到Asset Store商城的作品，有兴趣可以支持一下他

https://www.assetstore.unity3d.com/#!/content/125555

我的源码+模型有兴趣可以下载看一下

链接：https://pan.baidu.com/s/1vMyEiP8CyGv6wcDnccLiTQ 密码：ynoa

下面就进入正题了，我的简化版shader代码

Shader "My/Demo/Shield"
{
Properties
{
_ScanMap("ScanMap",2D)="white"{}
_ScanCol("ScanColor",color)=(1,1,1,1)
_ScanScale("ScanScale",range(0,0.2))=0.1
_ScanFrequency("ScanFrequency",range(0,1))=0.5
_ScanFresnelScale("ScanFresnelScale",range(0,1))=0.5
_ScanFresnelPow("ScanFresnelPow",range(0,10))=1
_ShieldMap("ShieldMap",2D)="white"{}
_ShieldCol("ShieldColor",color)=(1,1,1,1)
_ShieldFresnelScale("ShieldFresnelScale",range(0,1))=0.5
_ShieldFresnelPow("ShieldFresnelPow",range(0,10))=1
}
SubShader
{
Tags{"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
ZWrite Off
Blend SrcAlpha OneMinusSrcAlpha
CGINCLUDE
#include "UnityCG.cginc"
sampler2D _ScanMap;
float4 _ScanMap_ST;
fixed4 _ScanCol;
fixed _ScanScale;
fixed _ScanFrequency;
fixed _ScanFresnelScale;
float _ScanFresnelPow;
sampler2D _ShieldMap;
float4 _ShieldMap_ST;
fixed4 _ShieldCol;
fixed _ShieldFresnelScale;
float _ShieldFresnelPow;
struct a2v
{
float4 vertex:POSITION;
float4 shield:TEXCOORD0;
float4 scan:TEXCOORD1;
fixed4 color:COLOR;
float3 normal:NORMAL;
};
struct v2f
{
float4 pos:SV_POSITION;
float4 uv:TEXCOORD0;
float2 uv_Line:TEXCOORD4;
float3 WorldNormal:TEXCOORD1;
float3 WorldPos:TEXCOORD2;
float4 color:TEXCOORD3;
};
//ScanVert是修改顶点位置，然护盾有向外扩张的效果
v2f ScanVert(a2v v)
{
v2f o;
o.pos=mul(UNITY_MATRIX_MV,v.vertex);
float3 ViewNormal=mul((float3x3)UNITY_MATRIX_IT_MV,v.normal);
o.pos+=float4(ViewNormal,0)*_ScanScale;
o.pos=mul(UNITY_MATRIX_P,o.pos);
//把顶点位置转换到view位置然后向外扩张。
o.uv.xy=TRANSFORM_TEX(v.scan,_ScanMap);
o.uv.zw=TRANSFORM_TEX(v.shield,_ShieldMap);
o.WorldNormal=UnityObjectToWorldNormal(v.normal);
o.WorldPos=mul(_Object2World,v.vertex);
o.color=v.color;
return o;
}
fixed4 ScanFrag(v2f i):SV_Target
{
fixed scanAlpha=tex2D(_ScanMap,i.uv.xy+float2(0,1)*_Time.y*_ScanFrequency).a;
//判断scanAlpha是否等于0，等于0剔除
if(scanAlpha==0)
{
discard;
}
fixed3 WorldNormalDir=normalize(i.WorldNormal);
fixed3 WorldViewDir=normalize(_WorldSpaceCameraPos.xyz-i.WorldPos.xyz);
//fresnel 菲涅尔公式，边缘比较实，里面比较虚那种感觉，可以 直接 return backCol； 看一下效果
fixed fresnel=_ScanFresnelScale+(1-_ScanFresnelScale)*pow(1-saturate(dot(WorldNormalDir,WorldViewDir)),_ScanFresnelPow);
fixed fresnleAlpha=lerp(0,1,fresnel);
fixed4 backCol=fixed4(_ScanCol.rgb,fresnleAlpha);
fixed4 shieldCol=tex2D(_ShieldMap,i.uv.zw)*_ScanCol;
//shieldCol.a*scanAlpha是为了看起来中间实两边虚的效果（ps：纹理是渐变纹理来的）
shieldCol=fixed4(shieldCol.rgb,shieldCol.a*scanAlpha);
fixed4 finalCol=backCol+shieldCol;
return finalCol;
}
v2f ShiedlVert(a2v v)
{
v2f o;
o.pos=mul(UNITY_MATRIX_MVP,v.vertex);
o.uv.xy=TRANSFORM_TEX(v.scan,_ScanMap);
o.uv.zw=TRANSFORM_TEX(v.shield,_ShieldMap);
o.WorldNormal=UnityObjectToWorldNormal(v.normal);
o.WorldPos=mul(_Object2World,v.vertex);
o.color=v.color;
return o;
}
fixed4 ShieldFrag(v2f i):SV_Target
{
fixed scanAlpha=tex2D(_ScanMap,i.uv.xy+float2(0,1)*_Time.y*_ScanFrequency).a;
if(scanAlpha>0)
{
discard;
}
fixed3 WorldNormalDir=normalize(i.WorldNormal);
fixed3 WorldViewDir=normalize(_WorldSpaceCameraPos.xyz-i.WorldPos.xyz);
fixed fresnel=_ShieldFresnelScale+(1-_ShieldFresnelScale)*pow(1-saturate(dot(WorldNormalDir,WorldViewDir)),_ShieldFresnelPow);
fixed fresnleAlpha=lerp(0,1,fresnel);
fixed4 backCol=fixed4(_ShieldCol.rgb,fresnleAlpha);
fixed4 shieldCol=tex2D(_ShieldMap,i.uv.zw)*i.color*_ShieldCol;
fixed4 finalCol=backCol+shieldCol;
return finalCol;
}
ENDCG
Pass
{
CGPROGRAM
#pragma vertex ScanVert
#pragma fragment ScanFrag
ENDCG
}
Pass
{
CGPROGRAM
#pragma vertex ShiedlVert
#pragma fragment ShieldFrag
ENDCG
}
}
}

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