[Radiance-general] About angmap.cal
Despina Michael
despina_m81 at hotmail.com
Tue Apr 5 12:43:31 CEST 2005
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
------------------------------
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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