Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Radiance is a monte carlo simulation, so you're not likely to get exactly 10,000 lux but you can get closer by increasing the number of samples. To do that set -ad to something high like 50,000 and set -lw to 1/ad (2e-5) and you should get closer to 10,000 lux. The command looks like this:
echo 0 0 0 0 0 1 | rtrace -I -h -ab 1 -ad 50000 -lw 2e-5 octrees\sky.oct | rcalc -e "$1=179(.265$1+.670$2+.065$3)"
The more samples you send the more you'll converge to the correct result.
As for your sky not being grey, that is likely due to the parameters you're using for your sky glow material. Is this what your sky material looks like (from scene 0 tutorial)?
skyfunc glow sky_glow
0
0
4 0.9 0.9 1.15 0
The "0.9 0.9 1.15" is the RGB color assigned to the sky. To make the sky grey change them two be one:
skyfunc glow sky_glow
0
0
4 1 1 1 0
