1) i created .dat file (from unknown file format received) with luminous intensities (cd) for 1000 lm flux.
2 angles declared explicitly. (phi & theta are in the right order...)

2) i created .rad file with:

1 sphere (surface equals to .0056419m @ 10m hight ) as light geometry
the ground @0m height

where 2681 is from: (1/179 * 48000lm/1000lm * 10000)
i m working with 1 * 400W SAT and a sphere of radius equals to .0056419....)

NOW THE QUESTION:
i used rtrace to calculate orizontal illuminance (echo "x y z 0 0 1" | rtrace -I+ *.oct):
the point under the light (theta is 0) gives the same value i computed manually:
illuminance = intensity/height^2 * cos theta where theta = 0)

the bad thing is that points with different angles give not right values ( i tried 45° and 30° that are from .dat file)
(i got an error 10% plus or minus)

what's the matter???
some rtrace's settings.... what else?

i calculated illuminance @wrong points... so the fix was to think before click.. (point (-10 0 0) is not (0 -10 0) ......)

thanks again,

pillo

Lunedì, 16 Set 2002, alle 21:57 Europe/Rome, pillo ha scritto:

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Hello, here pillo with some problems...

the topic is luminaire modeling.

1) i created .dat file (from unknown file format received) with luminous intensities (cd) for 1000 lm flux.
2 angles declared explicitly. (phi & theta are in the right order...)

2) i created .rad file with:

1 sphere (surface equals to .0056419m @ 10m hight ) as light geometry
the ground @0m height

where 2681 is from: (1/179 * 48000lm/1000lm * 10000)
i m working with 1 * 400W SAT and a sphere of radius equals to .0056419....)

NOW THE QUESTION:
i used rtrace to calculate orizontal illuminance (echo "x y z 0 0 1" | rtrace -I+ *.oct):
the point under the light (theta is 0) gives the same value i computed manually:
illuminance = intensity/height^2 * cos theta where theta = 0)

the bad thing is that points with different angles give not right values ( i tried 45° and 30° that are from .dat file)
(i got an error 10% plus or minus)

what's the matter???
some rtrace's settings.... what else?