[Radiance-general] about luminaire modeling

[pillo]

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IT WAS MY FAULT:

no matters but ME!!!!

i calculated illuminance @wrong points... so the fix was to think=20
before click.. (point (-10 0 0) is not (0 -10 0) ......)

thanks again,

pillo




Luned=EC, 16 Set 2002, alle 21:57 Europe/Rome, pillo ha scritto:

> 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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IT WAS MY FAULT:


no matters but ME!!!!


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=20





Luned=EC, 16 Set 2002, alle 21:57 Europe/Rome, pillo ha scritto:


<excerpt>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)


</excerpt>=

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