Monochromatic Radiance ray-tracing

radiance-dev
1

Hello everyone,

I have been thinking on how to accelerate calculations for building
simulation. Then, I noticed that many people do gray simulations (i.e.
R=G=B)... accordingly;

   - Would it make sense to perform a monochromatic simulation?
   - would this save time considering that the ray-casting process will be
   done ayway?

I know it will save time for the matrix multiplication process (i.e. DC,
3phase, 5phase methods), but there is no need to modify the ray-tracing in
order to save time in the matrix mult.

Also, changing the "Radiance ray-tracer" is something out of my scope,
really... but I might try if I know it is useful.

THANKS EVERYONE!

···

--
*Germán Molina L.*
Ingeniero Trainee
Hunter Douglas Chile S.A.
Celular +569 89224445

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2

I really doubt it would save any significant time. As you say, the same rays are being traced, and this is the main cost in Radiance.

Cheers,
-Greg

···

From: CHI-German Molina <[email protected]>
Subject: [Radiance-dev] Monochromatic Radiance ray-tracing
Date: October 6, 2014 8:25:12 AM PDT

Hello everyone,

I have been thinking on how to accelerate calculations for building simulation. Then, I noticed that many people do gray simulations (i.e. R=G=B)... accordingly;
Would it make sense to perform a monochromatic simulation?
would this save time considering that the ray-casting process will be done ayway?
I know it will save time for the matrix multiplication process (i.e. DC, 3phase, 5phase methods), but there is no need to modify the ray-tracing in order to save time in the matrix mult.

Also, changing the "Radiance ray-tracer" is something out of my scope, really... but I might try if I know it is useful.

THANKS EVERYONE!

3

German,

some years ago we did something related to that - we used 81 instead of 3
channels to allow spectral renderings. Although having a factor of 27 in
the number of color channels, the computational overhead compared to the
RGB calculation was only around 40%. From that you can assume that going
from 3 to 1 channel would no really be worth it - as Greg already said.

Best,
David

···

2014-10-06 18:28 GMT+02:00 Gregory J. Ward <[email protected]>:

I really doubt it would save any significant time. As you say, the same
rays are being traced, and this is the main cost in Radiance.

Cheers,
-Greg

*From: *CHI-German Molina <[email protected]>

*Subject: *[Radiance-dev] Monochromatic Radiance ray-tracing

*Date: *October 6, 2014 8:25:12 AM PDT

Hello everyone,

I have been thinking on how to accelerate calculations for building
simulation. Then, I noticed that many people do gray simulations (i.e.
R=G=B)... accordingly;

   - Would it make sense to perform a monochromatic simulation?
   - would this save time considering that the ray-casting process will
   be done ayway?

I know it will save time for the matrix multiplication process (i.e. DC,
3phase, 5phase methods), but there is no need to modify the ray-tracing in
order to save time in the matrix mult.

Also, changing the "Radiance ray-tracer" is something out of my scope,
really... but I might try if I know it is useful.

THANKS EVERYONE!

_______________________________________________
Radiance-dev mailing list
[email protected]
http://www.radiance-online.org/mailman/listinfo/radiance-dev

4

Thanks Greg and David. I kind of already knew the answer to my questions, but was not sure (this algorithms keep confusing me)

Thanks Very much to both of you!

Germán

···

El 06-10-2014, a las 13:36, David Geisler-Moroder <[email protected]> escribió:

German,

some years ago we did something related to that - we used 81 instead of 3 channels to allow spectral renderings. Although having a factor of 27 in the number of color channels, the computational overhead compared to the RGB calculation was only around 40%. From that you can assume that going from 3 to 1 channel would no really be worth it - as Greg already said.

Best,
David

2014-10-06 18:28 GMT+02:00 Gregory J. Ward <[email protected]>:

I really doubt it would save any significant time. As you say, the same rays are being traced, and this is the main cost in Radiance.

Cheers,
-Greg

From: CHI-German Molina <[email protected]>
Subject: [Radiance-dev] Monochromatic Radiance ray-tracing
Date: October 6, 2014 8:25:12 AM PDT

Hello everyone,

I have been thinking on how to accelerate calculations for building simulation. Then, I noticed that many people do gray simulations (i.e. R=G=B)... accordingly;
Would it make sense to perform a monochromatic simulation?
would this save time considering that the ray-casting process will be done ayway?
I know it will save time for the matrix multiplication process (i.e. DC, 3phase, 5phase methods), but there is no need to modify the ray-tracing in order to save time in the matrix mult.

Also, changing the "Radiance ray-tracer" is something out of my scope, really... but I might try if I know it is useful.

THANKS EVERYONE!

_______________________________________________
Radiance-dev mailing list
[email protected]
http://www.radiance-online.org/mailman/listinfo/radiance-dev

_______________________________________________
Radiance-dev mailing list
[email protected]
http://www.radiance-online.org/mailman/listinfo/radiance-dev

--

*Nota de Confidencialidad:* Este mensaje incluído los archivos adjuntos son
confidenciales y pueden contener informacion privilegiada protegida por
ley. Si Ud. no es el destinatario, deberia abstenerse de copiarlo,
distribuirlo, divulgarlo o usar la informacion contenida. Por favor, avise
inmediatamente al emisor y borre este mensaje de su sistema. Los mensajes
electronicos son susceptibles de ser cambiados, infectados o adulterados
sin autorizacion. No asumimos responsabilidad alguna por ninguna clase de
cambios o sus consecuencias. Usted debe estar informado que la compania
puede hacer un seguimiento de sus mensajes electronicos y su contenido,
gracias.

*Confidentiality Notice:* The information contained in this email message,
including any attachment, is confidential and is intended only for the
person or entity to which it is addressed. If you are neither the intended
recipient nor the employee or agent responsible for delivering this message
to the intended recipient, you are hereby notified that you may not review,
retransmit, convert to hard copy, copy, use or distribute this email
message or any attachments to it. If you have received this email in error,
please contact the sender immediately and delete this message from any
computer or other data bank, Thank you.

A informação transmitida é confidencial e para conhecimento exclusivo do
destinatário. Sua utilização, não autorizada, constitui crime passível de
prisão. Todas as precauções possíveis foram tomadas para garantir que este
e-mail não contenha vírus. Uma vez que nossa empresa não pode assumir
responsabilidade por nenhuma perda ou dano causado por este e-mail ou de
seus anexos, recomendamos que o destinatário utilize seus procedimentos de
antivírus antes de qualquer uso.