项目要求一个文本自发光的效果，网上搜索了一下法线并没有找到有关代码，于是只能自己动手写了一个，先上效果吧

这里其实只用到了简单的模糊效果，本来想用的高斯模糊，但是发现效果还不如简单的模糊效果。下面是片元着色器的代码

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循环，就只能如此了，例子这里是取了每点周围五个像素作为源色彩，求得均值作为当前像素色彩。