Dear Radiance Users,
I’m a new user of Radiance. The questions that I will ask now might be very simple for you but I got confused.
I have a 3D model of a street in Sketch Up and exported it to Radiance to calculate how much radiation is reflected back and how the materials will affect the radiation within the street canyon. To learn the reflected value, I created small surfaces with a specific height in the middle of the street.
To produce a sky, gendaylit program is used with -E and -O 1 option because I have only global horizontal irradiance value for my site measured by a pyranometer. (gendaylit.exe 6 1 13:00 -E 904 -O 1 -a 51.1800 -o -1.0300 -m -15.0). Then, I combined my files (material.rad, sky.mat, objects.rad) with oconv command to render a scene.
This is one of my materials,
void plastic textured_dark_terra_cotta_brick
5 0.392 0.163 0.087 0 0
void alias myroof textured_dark_terra_cotta_brick.
After that, rvu and/or rpict command is used to see the irradiance value of a specific point.
rvu -vf views/Scene_1.vf -i -aa 0.15 -ab 7 -ad 4096 -ar 1024 -as 2048 mymodel.oct
rpict -vf views/Scene_1.vf -i -aa 0.15 -ab 7 -ad 4096 -ar 1024 -as 2048 -x 2240 -y 2240 mymodel.oct > myScene1.hdr
ximage -ov myScene1.hdr.
By pressing right button and enter it gives an irradiance value of the pixel on the displayed screen.
Question 1: Ok, I got the irradiance value of the pixel but When I look at the terminal, there are three values (RGB). what are the meanings of these three channels? Which one is the irradiance value.
(at (2.27286 1.96969 1.84) (5.40378)
value (122.94 83.069 67.404) (1.66e+04L))
Question 2: and How can I learn IR value of a specific point with these commands? or what should I do to calculate it?
I would be very grateful if you are able to answer the questions.
I look forward to hearing from you.Thank you very much in advance.