Hi

Can anyone explain this statement in the angmap.cal file.

r = if(d,0.159154943*Acos(DDz)/d, 0);

Is the 0.159154943 value related to the focal length and field of view

parameters for Paul Debevec's light map .hdrs, so that if I want to map my own

light maps I must calculate the value of r using my camera parameters (well

simulated in Radiance vv and vh angles) ?

Thanks for any help

Tarik

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Tarik Rahman

PhD student, Institute of Perception, Action and Behaviour

School of Informatics

University of Edinburgh

Hi Tarik,

This is an answer to your post about angmap.cal posted some weeks ago.

I am not absolutely sure but I guess 0.159154943 is just to map acos(Dz)/d to values between -0.5 and 0.5.

If you multiply 0.159154943 *PI= 0.5

PI is the greater value that acos(Dz)/d may be.

It does this in order to values of u and v range between 0 and 1.

Despina

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Hi

Can anyone explain this statement in the angmap.cal file.

r = if(d,0.159154943*Acos(DDz)/d, 0);

Is the 0.159154943 value related to the focal length and field of view

parameters for Paul Debevec's light map .hdrs, so that if I want to map my own

light maps I must calculate the value of r using my camera parameters (well

simulated in Radiance vv and vh angles) ?

Thanks for any help

Tarik