Shader-物体发光效果

内发光：

将物体边缘


```

v2f vert (appdata v)

{

v2f o;

o.vertex = UnityObjectToClipPos(v.vertex);

o.uv = TRANSFORM_TEX(v.uv, _MainTex);

o.worldNormal = mul(v.normal, (float3x3)unity_WorldToObject);

o.worldPos = mul(unity_ObjectToWorld, v.vertex);

return o;

}

fixed4 frag (v2f i) : SV_Target

{

// sample the texture

fixed4 col = tex2D(_MainTex, i.uv);

float3 worldNormal = normalize(i.worldNormal);

float3 viewDir = normalize(_WorldSpaceCameraPos.xyz - i.worldPos.xyz);

float cosValue = dot(worldNormal, viewDir);

//cos值大于阈值时不实现自发光效果

if (cosValue >= _Threshold) {

cosValue = 1;

}

return col + _SelfColor * (1-cosValue)*_Strength;

}

```

外发光：

使用法线外拓的方式，再创建一个Pass


```

Shader "Unlit/SelfLight"

{

Properties

{

_MainTex ("Texture", 2D) = "white" {}

_SelfColor("SelfColor",Color) = (1,1,1)

_Threshold("threshold",Range(0,1)) = 0.2

_Strength("Strength",Range(0,1)) = 1

_Size("lightSize",Range(0,5)) = 0.1

_OutLightPow("pow",Range(0,2)) = 1

_OutLightStrength("outLightStrength",Range(0,2)) = 1

_NormalSize("NormalSize",Range(0,1)) = 0.01

}

SubShade

{

Tags { "RenderType"="Opaque" }

LOD 100

Pass

{

CGPROGRAM

#pragma vertex vert

#pragma fragment frag

#include "UnityCG.cginc"

struct appdata

{

float4 vertex : POSITION;

float2 uv : TEXCOORD0;

float3 normal : NORMAL;

};

struct v2f

{

float2 uv : TEXCOORD0;

float4 vertex : SV_POSITION;

float3 worldNormal : TEXCOORD1;

float3 worldPos : TEXCOORD2;

};

sampler2D _MainTex;

float4 _MainTex_ST;

fixed4 _SelfColor;

float _Threshold;

float _Strength;

v2f vert (appdata v)

{

v2f o;

o.vertex = UnityObjectToClipPos(v.vertex);

o.uv = TRANSFORM_TEX(v.uv, _MainTex);

o.worldNormal = mul(v.normal, (float3x3)unity_WorldToObject);

o.worldPos = mul(unity_ObjectToWorld, v.vertex);

return o;

}

fixed4 frag (v2f i) : SV_Target

{

// sample the texture

fixed4 col = tex2D(_MainTex, i.uv);

float3 worldNormal = normalize(i.worldNormal);

float3 viewDir = normalize(_WorldSpaceCameraPos.xyz - i.worldPos.xyz);

float cosValue = dot(worldNormal, viewDir);

//cos值大于阈值时不实现自发光效果

if (cosValue >= _Threshold) {

cosValue = 1;

}

return col + _SelfColor * (1-cosValue)*_Strength;

}

ENDCG

}

Pass

{

Tags{ "LightMode" = "Always" }

Blend SrcAlpha One

CGPROGRAM

#pragma vertex vert

#pragma fragment frag

#include "UnityCG.cginc"

struct appdata

{

float4 vertex : POSITION;

float3 normal : NORMAL;

};

struct v2f

{

float4 vertex : SV_POSITION;

float3 worldNormal : TEXCOORD1;

float4 worldPos : TEXCOORD2;

};

sampler2D _MainTex;

float4 _MainTex_ST;

float4 _SelfColor;

float _Threshold;

float _Strength;

float _Size;

float _OutLightPow;

float _OutLightStrength;

float _NormalSize;

v2f vert(appdata v)

{

v.vertex.xyz += v.normal * _Size;

v2f o;

o.vertex = UnityObjectToClipPos(v.vertex);

o.worldNormal = mul(v.normal, (float3x3)unity_WorldToObject);

o.worldPos = mul(unity_ObjectToWorld, v.vertex);

return o;

}

fixed4 frag(v2f i) : SV_Target

{

// sample the texture

float3 worldNormal = normalize(i.worldNormal);

float3 viewDir = normalize(_WorldSpaceCameraPos.xyz - i.worldPos.xyz);

float cosValue = dot(worldNormal, viewDir);

if (cosValue <= _NormalSize) {

//cosValue = 1;

}

else {

cosValue = 0;

}

float4 color = _SelfColor;

color.a = pow(saturate(cosValue),_OutLightPow);

//_OutLightStrength += cos(10 * _Time.x);

color.a *= _OutLightStrength * dot(viewDir, i.worldNormal);

return color;

}

ENDCG

}

}

}

```