线性雾的计算公式

FogFactor=(FogEnd-dis(P,E))/(FogEnd-FogStart);

指数雾的计算公式

指数平方雾的计算公式

Texture2D ShaderTexture[3];  //纹理资源数组
SamplerState SampleType:register(s0);   //采样方式//VertexShader
cbuffer CBMatrix:register(b0)
{matrix World;matrix View;matrix Proj;matrix WorldInvTranpose;
};cbuffer CBLight:register(b1)
{float4 SpecularColor;float4 AmbientColor;float4 DiffuseColor;float3 LightDirection;float SpecularPow;
};cbuffer CBCamera:register(b2)
{float3 CameraPos;float Pad;
};cbuffer CBFog:register(b3)
{float FogStart;float FogEnd;float pad1;float pad2;
};struct VertexIn
{float3 Pos:POSITION;float2 Tex:TEXCOORD0;  //多重纹理可以用其它数字float3 Normal:NORMAL;float3 Tangent:TANGENT;float3 Binormal:BINORMAL;
};struct VertexOut
{float4 Pos:SV_POSITION;float3 Pos_W:POSITION;float2 Tex:TEXCOORD0;float3 Normal_W:NORMAL;float3 Tangent_W:TANGENT;float3 Binormal_W:BINORMAL;float3 LookDirection:NORMAL1;
};VertexOut VS(VertexIn ina)
{VertexOut outa;//变换坐标到齐次裁剪空间(CVV)outa.Pos = mul(float4(ina.Pos,1.0f), World);outa.Pos = mul(outa.Pos, View);outa.Pos = mul(outa.Pos, Proj);outa.Tex= ina.Tex;//将法线量由局部空间变换到世界空间，并进行规格化outa.Normal_W = mul(ina.Normal, (float3x3)WorldInvTranpose);outa.Normal_W = normalize(outa.Normal_W);//将切向量由局部空间变换到世界空间，并且进行规格化outa.Tangent_W = mul(ina.Tangent,(float3x3)World);outa.Tangent_W = normalize(outa.Tangent_W);//将切向量由局部空间变换到世界空间，并且进行规格化outa.Binormal_W = mul(ina.Binormal, (float3x3)World);outa.Binormal_W = normalize(outa.Binormal_W);//求出顶点在世界空间的位置float3 worldPos= (float3)mul(float4(ina.Pos, 1.0f), World);outa.Pos_W = worldPos;//计算出每个顶点到相机的单位向量,之后在光栅化阶段进行插值outa.LookDirection =CameraPos.xyz - worldPos.xyz;outa.LookDirection = normalize(outa.LookDirection);return outa;
}float4 PS(VertexOut outa) : SV_Target
{float4 BasePixel; float3 BumpNormal;  //隆起法向量float4 color;float DiffuseFactor;  //漫反射因子float SpecularFactor; //镜面反射因子float4 Specular; //镜面反射颜色float4 SpecularIntensity; //镜面强度float FogFactor;//增加漫反射光颜色color = AmbientColor;//求每个像素的纹理像素颜色BasePixel = ShaderTexture[0].Sample(SampleType, outa.Tex);//求每个像素的隆起法向量（切线空间）BumpNormal=(float3)ShaderTexture[1].Sample(SampleType, outa.Tex);BumpNormal = (2.0f*BumpNormal) - 1.0f;//-----求出TBN矩阵（已经和世界变换矩阵结合在一起）--------float3 N = outa.Normal_W;float3 T = outa.Tangent_W;float3 B = outa.Binormal_W;//将隆起法向量由切线空间变换到局部空间，再到世界空间,然后规格化//BumpNormal= mul(BumpNormal,float3x3(T,B,N));BumpNormal = N + BumpNormal.x*T + BumpNormal.y*B;BumpNormal = normalize(BumpNormal);//求出漫反射因子float3 InvLightDirection = -LightDirection;DiffuseFactor = saturate(dot(BumpNormal, InvLightDirection));color += DiffuseColor*DiffuseFactor;color = saturate(color);//乘以基础纹理颜色color = color*BasePixel;//如果漫射因子为正时,漫反射光和镜面才存在意义if (DiffuseFactor > 0){//求出入射光的反射向量，此时的法线量应该为法线贴图的法向量，别把参数位置搞反了float3 ReflectLightDir = normalize(reflect(LightDirection,BumpNormal));//float3 ReflectLightDir = normalize(2 * DiffuseFactor*BumpNormal - InvLightDirection);//求每个像素的镜面强度SpecularIntensity = ShaderTexture[2].Sample(SampleType, outa.Tex);//求出镜面反射因子SpecularFactor = pow(saturate(dot(outa.LookDirection, ReflectLightDir)), SpecularPow);//求出镜面颜色,为什么这里用不上SpecularColor？？Specular = SpecularFactor  *SpecularIntensity;color = color + Specular;  //确实只有镜面光被计算 才加上}color = saturate(color);//求出相机到像素点的距离float EyeToPixelDistance = length(CameraPos - outa.Pos_W);//计算出线性雾气因子FogFactor = (FogEnd - EyeToPixelDistance) / (FogEnd - FogStart);//计算融合雾气后的颜色float4 FogColor = float4(0.5f, 0.5f, 0.5f, 1.0f);color = FogFactor*color + (1 - FogFactor)*FogColor;return color;
}

//第一,清除缓存开始绘制场景,清除背后缓存为灰色，模拟雾的背景mD3D->BeginScene(0.5f, 0.5f, 0.5f, 1.0f);

我的程序运行图: