[Radiance-general] about luminaire modeling

[pillo]

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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=20
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


the light material has this definition:

void brightdata dist
5 corr source.dat source.cal src_phi2 src_theta
0
1 2681

dist light point
0
0
3 1 1 1

where 2681 is from: (1/179 * 48000lm/1000lm * 10000)
i m working with 1 * 400W SAT  and a sphere of radius equals to=20
.0056419....)

NOW THE QUESTION:
i used rtrace to calculate orizontal illuminance (echo "x y z 0 0 1" |=20=

rtrace -I+ *.oct):
the point under the light  (theta is 0) gives the same value  i=20
computed manually:
illuminance =3D intensity/height^2 * cos theta where theta =3D 0)

the bad thing is that points with different angles give not right=20
values ( i tried 45=B0 and 30=B0 that are from .dat file)
(i got an error 10% plus or minus)

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

thanks for every kind of advice you'll gave me


pillo (g.antonutto)


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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=20

the ground @0m height

=20


the light material has this definition:


<italic>void brightdata dist

5 corr source.dat source.cal src_phi2 src_theta=20

0

1 2681


dist light point

0

0

3 1 1 1</italic>


where 2681 is from: (1/179 * 48000lm/1000lm * 10000)=20

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 =3D intensity/height^2 * cos theta where theta =3D 0)


the bad thing is that points with different angles give not right
values ( i tried 45=B0 and 30=B0 that are from .dat file)

(i got an error 10% plus or minus)


what's the matter???

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


thanks for every kind of advice you'll gave me



pillo (g.antonutto)



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