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nico92

depth of field coc questions

3 posts in this topic

Hi all !

 

I'm currently trying some various graphics techniques and I have some questions regarding the depth of field and more specially about computing the COC...

 

I use this computation for the COC : A * (F*(P-D)) / (D*(P-F)) where A = aperture diameter, F = Focal length, P = Focus Plane and D = object distance. (Note that I saw some paper using D-P instead of P-D in the first part, not sure which one is the good one ...)

 

A, F and P come from the camera settings and D is the taken from the depth buffer but I'm having problems with the computed size ... If my engine unit is 1 = 1m I need to convert the other parameters to the same unit correct ? (that means aperture size from mm to m, same for F and P) 

 

Also using the 1st equation should give me the same result as using the CoCScale & Bias when using the raw z right ?

 

Thanks !

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Argh, this editor is giving me lots of trouble. I will re-post when I get back from lunch.

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Thanks for the reply it cleared up my head !

 

I tried to use the simplified version of the coc computation but I don't get the same results, I don't get why for now :/ 

 

 

 

The circle of confusion can alternatively be calculated from the z-buffer values, with the camera parameters lumped into scale and bias terms:

CoC = abs(z * CoCScale + CoCBias)

The scale and bias terms are calculated from the camera parameters:

CoCScale = (aperture * focallength * planeinfocus * (zfar - znear)) /
((planeinfocus - focallength) * znear * zfar)
CoCBias = (aperture * focallength * (znear - planeinfocus)) /
((planeinfocus * focallength) * znear)
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