I have recently installed RADIANCE 4.1 on my mac (ver 10.7.4) and i
was, up until recently, merrily making my way through Axel's rtcontrib
# I am getting stuck when trying to implement gendaylit . . .
# I have what i consider to be acceptable input to gendaylit:
kyle% gendaylit 6 24 11.5 -a 51.15 -o 0.18 -m -0 -W 159 447
# and the error message:
# gendaylit 6 24 11.5 -a 51.15 -o 0.18 -m 0 -W 159 447
file coeff_perez.dat cannot be opened
lect_coeff_perez does not work
# the direct normal value and diffuse horizontal value, along with the
day, month, hour, latitude, longitude, and meridian, are from the
Gatwick epw file GBR_London.Gatwick.037760_IWEC.epw which is
considered by Axel (in his tutorial) to be of sufficient quality to
not produce gendaylit errors, and i think i am pulling realistic
weather values for that time, so i'm perplexed here. And i've tried a
few other times and values, but my guess is that it's not struggling
to make a sky model and giving up.
Is it a simple permission issue?
I've tried chmod 755 and chmod 644 to the coeff_perez.dat but it
already had acceptable permissions assigned to it.
is it a location issue?
the file is in /usr/local/ray/src/gen
is it a PATH issue? (here is from my env)
Any suggestions would be appreciated, as usual, it is probably
something very simple. . .