[source code="C#"]
    //read depth
    float depthVal = tex2D(depthSampler,input.TexCoord).r;

    //compute screen-space position
    float4 position;
    position.x = input.TexCoord.x * 2.0f - 1.0f;
    position.y = -(input.TexCoord.x * 2.0f - 1.0f);
    position.z = depthVal;
    position.w = 1.0f;
    //transform to world space
    position = mul(position, InvertViewProjection);
    position /= position.w;

[source code="C#"]float4 PixelShaderFunction(VertexShaderOutput input) : COLOR0{    //get normal data from the normalMap    float4 normalData = tex2D(normalSampler,input.TexCoord);    //tranform normal back into [-1,1] range    float3 normal = 2.0f * normalData.xyz - 1.0f;    //get specular power, and get it into [0,255] range]    float specularPower = normalData.a * 255;    //get specular intensity from the colorMap    float specularIntensity = tex2D(colorSampler, input.TexCoord).a;        //read depth    float depthVal = tex2D(depthSampler,input.TexCoord).r;    //compute screen-space position    float4 position;    position.x = input.TexCoord.x * 2.0f - 1.0f;    position.y = -(input.TexCoord.y * 2.0f - 1.0f);    position.z = depthVal;    position.w = 1.0f;    //transform to world space    position = mul(position, InvertViewProjection);    position /= position.w;    //fog (if i comment the line above the fog looks better, more dense, but models are drawn like in an ambient light or so only):float d = length(position - cameraPosition);float l = saturate((d-fog.near)/(fog.far-fog.near));        //surface-to-light vector    float3 lightVector = -normalize(lightDirection);		    	    //float4x4 viewToLightViewProj=mul(InvertViewProjection,LightsViewProjection);    //float4 Pos2DAsSeenByLight=mul(lightVector,viewToLightViewProj);    float4 Pos2DAsSeenByLight=mul(position,LightsViewProjection);	    float2 ProjectedTexCoords;    ProjectedTexCoords[0] = Pos2DAsSeenByLight.x/Pos2DAsSeenByLight.w/2.0f +0.5f;    ProjectedTexCoords[1] = -Pos2DAsSeenByLight.y/Pos2DAsSeenByLight.w/2.0f +0.5f;        //compute diffuse light    float diffuseLightingFactor = 0;    if ((saturate(ProjectedTexCoords).x == ProjectedTexCoords.x) && (saturate(ProjectedTexCoords).y == ProjectedTexCoords.y))    {        float depthStoredInShadowMap = tex2D(ShadowMapSampler, ProjectedTexCoords).r;        float realDistance = Pos2DAsSeenByLight.z/Pos2DAsSeenByLight.w;        if ((realDistance - 1.0f/100.0f) <= depthStoredInShadowMap)        {            diffuseLightingFactor = max(0,dot(normal,lightVector));            diffuseLightingFactor = saturate(diffuseLightingFactor);        }    }            //float NdL = max(0,dot(normal,lightVector));    //float3 diffuseLight = NdL * Color.rgb;    float3 diffuseLight = diffuseLightingFactor * Color.rgb;    //reflexion vector    float3 reflectionVector = normalize(reflect(-lightVector, normal));    //camera-to-surface vector    float3 directionToCamera = normalize(cameraPosition - position);    //compute specular light    float specularLight = specularIntensity * pow( saturate(dot(reflectionVector, directionToCamera)), specularPower);    //output the two lights    //return lightIntensity * float4(diffuseLight.rgb, specularLight) ;        //return lerp(lightIntensity * float4(diffuseLight.rgb, specularLight), fog.color, l);    return lerp(lightIntensity * float4(diffuseLight.rgb, specularLight), fog.color, l);}