# Top of the line vs Old crap

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Not yet but I'm still on it

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Ok here is my next try. I knew I missed something and I hope I finally got it.
First of all I'm using the output.Position.w value for the depth now so it looks like this:

output.Position.z = log(output.Position.w*0.001f + 1) / log(0.001f*FarPlane +1) * output.Position.w;

And here is the reconstruction code:

float4 mapValue = tex2D(DepthMapSampler, PSIn.texCoord + dimensionOffset);
float depth = mapValue.x;
depth = ((pow((0.001 * FarPlane) + 1, depth) - 1) / 0.001);
depth /=  (NearPlane*FarPlane/(FarPlane-NearPlane));
PSIn.ProjPos.xy *= depth;
float4 invProjPos = mul(PSIn.ProjPos ,xInvProjection);
invProjPos.z = -depth;
float4 worldPos = mul(invProjPos, xInvView);
worldPos /= worldPos.w;

The thing I missed was the division. Cameni gave me the hint when he said the w-component contains the view space depth and he is right it contains it but is not equal to it due to the projection matrix multiplication so you need to extract it before you can use it. Be careful with the signs. I'm using a right handed projection Matrix and I think you need to change them when using a lefthanded. It should be enough to add a negativ sign to the division.

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Wow, it actually works. I think that last line, the worldPos /= worldPos.w was the key. The depth /= (NearPlane*FarPlane/(FarPlane-NearPlane)) line doesn't seem to have any effect that I can notice though. Thanks for you help!

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Hmm strange, for me it's not lighting anything without that line but however I'm glad it's finally working.

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Indeed, good to have it working. Now to get it to work and make it all sexy like! :P

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So, how would we get something to look like this:

Their lights seem to... have a brighter center. How would we go about doing this? This is what ours looks like:

We attempted to boost up the bloom to amplify it but our bloom either sucks or.... its just not working right. The bloom is MAXED btw. ( not ideal for getting the effect we might need in some locations )

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You don't need to keep view space position for the logarithmic depth. You can use the value of w, since it contains the view space depth after projection:
output.Position.z = log(0.001 * output.Position.w + 1) / log(0.001 * FarPlane + 1) * output.Position.w;

That's because the projection matrix (D3DXMatrixPerspectiveFovLH) is:

w       0       0               0
0       h       0               0
0       0       zf/(zf-zn)      1
0       0       -zn*zf/(zf-zn)  0

And thus w ? z, w ends up with the view space depth.

Kinda off topic, i just saw your video of your engine. Fucking amazing! A job well done and thank you for the help with this. qui and you certainly have been a huge help.

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This topic is 1822 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.