[Radiance-general] sky mapping

[Giovanni Betti]

Dear All,

 

I am trying to remap accurately an angular fisheye view of the sky using
the proj_pict_fisheye.cal developed by Peter Apian-Bennewitz, ISE, on
July 96 (as it is reported on the copyright header in the .cal file) to
subsequently use it as light source for a diffuse sky simulation.

 

It seems to work fairly well (the error at the centre is about 1% of the
original image) but

1) a bright circle forms along the horizon 

2) the remapped image is constantly less bright than the original one

 

If anybody has any idea about the reason behind this behaviour it would
be very helpful

 

Thanks in advance,

Best Regards,

 

Giovanni

 

 

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