[Radiance-general] multiple modifications to sky definitions

[Marija Velickovic]

Hi,

I think these sky images are only for nice image representation, and
I'm not sure that they have correct radiance pixel values.
To obtain a sky with appropriate luminance distribution (generated
with gensky), and beautiful colors and clouds (as on Simon Crone's
images), images should be normalized first with normpat and then used
as Jack explained in previous mail.

On some of Simon's images there is a sun, and when you apply it as a
pattern for a sunny sky made with gensky, you'll obtain a sky with 2
suns :)
So again I suggest you to use this skies only for artistic or
representation use, and not for accurate visualizations.

If I'm wrong, please correct me!

Marija.

2008/4/1 Jack de Valpine <jedev at visarc.com>:
> Hi Dave,
>
>  You should apply the skyfunc modifier to the colorpict. Skyfunc is produced
> by gensky.  You can combine everything as follows:
>
>
>  !gensky 4 1 +12.00 -i -a 42.44 -o -76.5 -m 300
>
>  skyfunc colorpict sky_map
>
>  7       red green blue midday.pic  skymap.cal map_u map_v
>  0
>  1       .5
>
>  sky_map glow sky_mat
>  0
>  0
>  4  1 1 1 0
>
>  sky_mat source sky
>  0
>  0
>  4  0 0 1 180
>
>  NOTE that you should probably also add a ground glow as follows:
>
>  skyfunc glow ground_glow
>
>  0
>  0
>  4 1 1 1 0
>
>  ground_glow source ground
>
>  0
>  0
>  4 0 0 -1 180
>
>  Regards,
>
>  -Jack de Valpine
>