[Radiance-general] applied material to all faces of a genbox

[Thomas Bleicher]

On 24 May 2008, at 12:04, steve michel wrote:

> BTW Matiu Carr's Image mapping has a snippet of the picture.cal  
> function code. This documentation is helpful but I found out the  
> latest picture.cal packaged with radiance3.8 file has commented  
> lines in picture.cal describing what each item does in the function.
>
> Now Im wondering if there is a valid way of mapping a panaromic pic  
> for a view through those wonderful daylight views we love so much.

Simon Crone wrote 'skymap.cal' to map panoramic sky images to the
sky hemisphere. You can download examples (and the .cal file) here:

http://radsite.lbl.gov/radiance/pub/libraries/

> The doc shows mapping on a tube with cyl.cal as way of doing just  
> that. But that might interfere with skyglow and ruin the lux  
> readings? Would a HDR mage mapped to the sky itself with sky  
> luminance values 'indexed' to the bitmap's rgb values achieve a  
> more accurate result??

See Paul Debevec's work on HDR lighting:

http://www.debevec.org/probes/


Regards,
Thomas