項目要求一個文本自發光的效果，網上搜索了一下法線并沒有找到有關代碼，于是只能自己動手寫了一個，先上效果吧

這里其實只用到了簡單的模糊效果，本來想用的高斯模糊，但是發現效果還不如簡單的模糊效果。下面是片元著色器的代碼

float getTransparent(sampler2D MainTex, float2 ?uv)

{

fixed4 result = tex2D(_MainTex, uv);

return result.a;

}

fixed4 frag (v2f i) : COLOR

{

fixed4 lightCol = fixed4(0.0f, 0.612f, 1.0f, 1.0f);

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

float accAlpha = 0;

float offsetValue = _OffsetValue;

int lev = 7;

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, -7));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, -6));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, -5));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, -4));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, -3));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, -2));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, -1));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, 0));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, 1));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, 2));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, 3));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, 4));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, 5));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, 6));

++lie;

}

for(int lie = 0 - lev; lie <= lev;)

{

accAlpha = accAlpha + getTransparent(_MainTex, i.uv + offsetValue*float2(lie, 7));

++lie;

}

fixed4 col = 1*result.a + lightCol.rgba*(1.0f - result.a);

col.a = result.a + accAlpha/(float)((2*lev+1)*(2*lev+1));

col.a = col.a*(col.a + 1);

return col;

}

unity的shader貌似不能嵌套for循環，就只能如此了，例子這里是取了每點周圍五個像素作為源色彩，求得均值作為當前像素色彩。

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