[Radiance-general] What does "ray coefficient" mean?

[Ji Zhang]

Dear List,

May I ask what the "ray coefficient" means in the RCONTRIB man page?

I'm going back to Axel Jacobs' tutorial on "rtcontrib(rcontrib now)":
http://www.jaloxa.eu/resources/radiance/documentation/docs/rtcontrib_lesson.pdf

and I tried the following with the *-ffa* option for rcontrib to see what
is the output in ascii format:




*vwrays -ff -x 600 -y 600 -vf ./views/back.vf \| rcontrib -ab 3 -ad 1024
-ar 256 -aa .1 -ffa \`vwrays -d -x 600 -y 600 -vf ./views/back.vf` -m
sky_glow -n 2 -V+ \./testroom_overcast.oct > ./tmp/rcontrib-ffa.txt*

The output contains the following:











*#?RADIANCEoconv materials/testroom.mat objects/testroom.rad
skies/sky_overcast.mat skies/sky.radrcontrib -ab 3 -ad 1024 -ar 256 -aa .1
-ffa -x 600 -y 430 -ld- -m sky_glow -n 2 -V+SOFTWARE= RADIANCE 4.2a lastmod
Sat Jun 23 22:34:17 SGT 2012 by root on oats-iMac.localCAPDATE= 2013:12:28
23:54:10GMT= 2013:12:28 15:54:10FORMAT=ascii-Y 430 +X 6001.359378e-02
1.359378e-02    1.359378e-02    1.359378e-02    1.359378e-02
1.359378e-02   *

*...*
*(this continues for 258000 rows in total)*

May I ask:
1. what the 3 values in each row represents for each pixel?
2. How is this function of rcontrib related to the calculation of daylight
coefficient?


*Thanks you all for your kind help and wish you all a happy new year!*

- Ji
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