Rendering BRDF measureddata(custom)withRadiance

Alessandro_Artus · August 15, 2007, 10:56am

I would like to render BRDF measured data with global Illumination
technique, having predefined complex light source.

I would like to simulate the reflection process on the material, for
having a realistic representation of it.

Alessandro.

···

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Giulio Antonutto
Sent: Wednesday, August 15, 2007 11:39 AM
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF
measureddata(custom)withRadiance

one is that for indirect calculation it's all based on the r g b
coefficients.

the second is that 'specular reflection' will work just with sources and
not the environment.

so for instance if you are rendering a motorway with a wet asphalt it
will how the reflection of the luminaire but not the reflection of the
other objects.

what are you using BRDF for?

G.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Alessandro Artus
Sent: 15 August 2007 11:17
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF measured
data(custom)withRadiance

Thanks Giulio,

Could you explain me the limitations.

Thanks again

Alessandro.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Giulio Antonutto
Sent: Wednesday, August 15, 2007 11:00 AM
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF measured data
(custom)withRadiance

yes you can but with some limitations.

you need to write a cal file to describe how the data is collected.

plasdata/transdata are a good start.

G.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Alessandro Artus
Sent: 15 August 2007 10:44
To: [email protected]
Subject: [Radiance-general] Rendering BRDF measured data (custom)
withRadiance
Importance: High

Dear All,

Some one can tell me if it possible to render BRDF data measurement with
Radiance?

Thanks in advance.

Best Regards,

Alessandro.

____________________________________________________________
Electronic mail messages entering and leaving Arup business
systems are scanned for acceptability of content and viruses

Giulio_Antonutto1 · August 15, 2007, 11:11am

you may find this interesting, perhaps just a starting point...

http://web.mac.com/geotrupes/iWeb/Main%20site/RadBlog/F684499E-33AE-4E8C
-959A-85AF81FDBCB5.html

when you say 'complex light sources'...

do you mean that you are modelling the lamp + reflector? Radiance may
struggle a little to evaluate the full thing... you may want to pre
process your sources with trace pro or something similar and use the
ies...

(you may do this in radiance as well but it's trickier)

G.

···

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Alessandro Artus
Sent: 15 August 2007 11:56
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF
measureddata(custom)withRadiance
Importance: High

I would like to render BRDF measured data with global Illumination
technique, having predefined complex light source.

I would like to simulate the reflection process on the material, for
having a realistic representation of it.

Alessandro.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Giulio Antonutto
Sent: Wednesday, August 15, 2007 11:39 AM
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF
measureddata(custom)withRadiance

one is that for indirect calculation it's all based on the r g b
coefficients.

the second is that 'specular reflection' will work just with sources and
not the environment.

so for instance if you are rendering a motorway with a wet asphalt it
will how the reflection of the luminaire but not the reflection of the
other objects.

what are you using BRDF for?

G.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Alessandro Artus
Sent: 15 August 2007 11:17
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF measured
data(custom)withRadiance

Thanks Giulio,

Could you explain me the limitations.

Thanks again

Alessandro.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Giulio Antonutto
Sent: Wednesday, August 15, 2007 11:00 AM
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF measured data
(custom)withRadiance

yes you can but with some limitations.

you need to write a cal file to describe how the data is collected.

plasdata/transdata are a good start.

G.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Alessandro Artus
Sent: 15 August 2007 10:44
To: [email protected]
Subject: [Radiance-general] Rendering BRDF measured data (custom)
withRadiance
Importance: High

Dear All,

Some one can tell me if it possible to render BRDF data measurement with
Radiance?

Thanks in advance.

Best Regards,

Alessandro.

____________________________________________________________
Electronic mail messages entering and leaving Arup business
systems are scanned for acceptability of content and viruses

Alessandro_Artus · August 15, 2007, 11:23am

Hi,

Thanks a lot of the example.

With complex light source I mean that I measure it.

Concerning your example I am beginner with Radiance, in test.data I
guess are included the measured BRDF right?

Alessandro.

···

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Giulio Antonutto
Sent: Wednesday, August 15, 2007 12:11 PM
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF
measureddata(custom)withRadiance

you may find this interesting, perhaps just a starting point...

http://web.mac.com/geotrupes/iWeb/Main%20site/RadBlog/F684499E-33AE-4E8C
-959A-85AF81FDBCB5.html

when you say 'complex light sources'...

do you mean that you are modelling the lamp + reflector? Radiance may
struggle a little to evaluate the full thing... you may want to pre
process your sources with trace pro or something similar and use the
ies...

(you may do this in radiance as well but it's trickier)

G.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Alessandro Artus
Sent: 15 August 2007 11:56
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF
measureddata(custom)withRadiance
Importance: High

I would like to render BRDF measured data with global Illumination
technique, having predefined complex light source.

I would like to simulate the reflection process on the material, for
having a realistic representation of it.

Alessandro.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Giulio Antonutto
Sent: Wednesday, August 15, 2007 11:39 AM
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF
measureddata(custom)withRadiance

one is that for indirect calculation it's all based on the r g b
coefficients.

the second is that 'specular reflection' will work just with sources and
not the environment.

so for instance if you are rendering a motorway with a wet asphalt it
will how the reflection of the luminaire but not the reflection of the
other objects.

what are you using BRDF for?

G.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Alessandro Artus
Sent: 15 August 2007 11:17
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF measured
data(custom)withRadiance

Thanks Giulio,

Could you explain me the limitations.

Thanks again

Alessandro.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Giulio Antonutto
Sent: Wednesday, August 15, 2007 11:00 AM
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF measured data
(custom)withRadiance

yes you can but with some limitations.

you need to write a cal file to describe how the data is collected.

plasdata/transdata are a good start.

G.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Alessandro Artus
Sent: 15 August 2007 10:44
To: [email protected]
Subject: [Radiance-general] Rendering BRDF measured data (custom)
withRadiance
Importance: High

Dear All,

Some one can tell me if it possible to render BRDF data measurement with
Radiance?

Thanks in advance.

Best Regards,

Alessandro.

____________________________________________________________
Electronic mail messages entering and leaving Arup business
systems are scanned for acceptability of content and viruses

Alessandro_Artus · August 15, 2007, 5:27pm

Thanks a lot Giulio

···

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Giulio Antonutto
Sent: Wednesday, August 15, 2007 12:11 PM
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF
measureddata(custom)withRadiance

you may find this interesting, perhaps just a starting point...

http://web.mac.com/geotrupes/iWeb/Main%20site/RadBlog/F684499E-33AE-4E8C
-959A-85AF81FDBCB5.html

when you say 'complex light sources'...

do you mean that you are modelling the lamp + reflector? Radiance may
struggle a little to evaluate the full thing... you may want to pre
process your sources with trace pro or something similar and use the
ies...

(you may do this in radiance as well but it's trickier)

G.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Alessandro Artus
Sent: 15 August 2007 11:56
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF
measureddata(custom)withRadiance
Importance: High

I would like to render BRDF measured data with global Illumination
technique, having predefined complex light source.

I would like to simulate the reflection process on the material, for
having a realistic representation of it.

Alessandro.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Giulio Antonutto
Sent: Wednesday, August 15, 2007 11:39 AM
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF
measureddata(custom)withRadiance

one is that for indirect calculation it's all based on the r g b
coefficients.

the second is that 'specular reflection' will work just with sources and
not the environment.

so for instance if you are rendering a motorway with a wet asphalt it
will how the reflection of the luminaire but not the reflection of the
other objects.

what are you using BRDF for?

G.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Alessandro Artus
Sent: 15 August 2007 11:17
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF measured
data(custom)withRadiance

Thanks Giulio,

Could you explain me the limitations.

Thanks again

Alessandro.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Giulio Antonutto
Sent: Wednesday, August 15, 2007 11:00 AM
To: Radiance general discussion
Subject: RE: [Radiance-general] Rendering BRDF measured data
(custom)withRadiance

yes you can but with some limitations.

you need to write a cal file to describe how the data is collected.

plasdata/transdata are a good start.

G.

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of
Alessandro Artus
Sent: 15 August 2007 10:44
To: [email protected]
Subject: [Radiance-general] Rendering BRDF measured data (custom)
withRadiance
Importance: High

Dear All,

Some one can tell me if it possible to render BRDF data measurement with
Radiance?

Thanks in advance.

Best Regards,

Alessandro.

____________________________________________________________
Electronic mail messages entering and leaving Arup business
systems are scanned for acceptability of content and viruses