multiple modifications to sky definitions

radiance-general
1

Hello All-

I have been trying out Simon Crone's beautiful sky images, and can't find the right syntax to map both illuminance distributions and these images to a sky source.

Simon advises:
"These sky environments do not deal with any sky illuminance
distributions as they are simply mapped colour images. You can
use gensky etc. to further modify these sky environment."

so, how can I combine:

void 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

with:

!gensky 4 1 +12.00 -i -a 42.44 -o -76.5 -m 300

skyfunc glow sky_mat
0
0
4 1 1 1 0

sky_mat source sky
0
0
4 0 0 1 180

I gather this is a problem of applying multiple modifications to a single composite material?

thanks a lot!

Dave Bosworth
Cornell University
Ithaca New York

2

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
4 1 1 1 0

sky_mat source sky
0
4 0 0 1 180

NOTE that you should probably also add a ground glow as follows:

skyfunc glow ground_glow
0
4 1 1 1 0

ground_glow source ground
0
4 0 0 -1 180

Regards,

-Jack de Valpine

Dave Bosworth wrote:

···

Hello All-

I have been trying out Simon Crone's beautiful sky images, and can't find the right syntax to map both illuminance distributions and these images to a sky source.

Simon advises:
"These sky environments do not deal with any sky illuminance
distributions as they are simply mapped colour images. You can use gensky etc. to further modify these sky environment."

so, how can I combine:

void colorpict sky_map
7 red green blue midday.pic skymap.cal map_u map_v
0
1 .5

sky_map glow sky_mat
0
4 1 1 1 0

sky_mat source sky
0
4 0 0 1 180

with:

!gensky 4 1 +12.00 -i -a 42.44 -o -76.5 -m 300

skyfunc glow sky_mat
0
4 1 1 1 0

sky_mat source sky
0
4 0 0 1 180

I gather this is a problem of applying multiple modifications to a single composite material?

thanks a lot!

Dave Bosworth
Cornell University
Ithaca New York

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# president
#
# visarc incorporated
# http://www.visarc.com
#
# channeling technology for superior design and construction

3

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 :slight_smile:
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 <[email protected]>:

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