[Bldg-sim] Radiance Materials database
J. Alstan Jakubiec
alstan at jakubiec.net
Fri Sep 18 16:53:04 PDT 2015
Hi Christopher and Nick,
In terms of some more real world examples, we have been working on an
opaque materials database: http://www.lighting-materials.com/ The
website is still a bit in progress, and we are still collecting
measurements, but the goal is to give realizable examples of material
reflectances, especially for unusual materials. And it works right now!
It is relatively easy to find blue colored materials by searching via
color. A quick ordinal diagram is below,
We have also measured several wood surfaces, which you can find by
searching by name for 'wood.' Hopefully this can also help to bracket
your material properties and define some proper R-G-B color combinations
for your scene. There are also a number of white wall surfaces in the
database. By clicking on any of the results, you get more detailed
information including the R-G-B primaries for a physically-based
Radiance material. There is some more information about this undertaking
in the second half of our Radiance workshop presentation
<http://radiance-online.org/community/workshops/2015-philadelphia/presentations/day3/jakubiec-balakrishnan_materials.pdf>
given last month in Philadelphia.
I agree that defining specific textures and wood grains is painful and
difficult to make accurate. In my opinion the texture of the carpet
tiles and the wood surfaces can be ignored unless those aspects will
modify the light contribution significantly. By trying to get this as
correct as possible, you are already doing way more than the average
LEEDv4 lighting simulation, I am certain.
All the best,
Alstan
J. Alstan Jakubiec
Assistant Professor
Architecture and Sustainable Design
Singapore University of Technology and Design
8 Somapah Road, Singapore 487372
telephone: +65 6499 4530, e-mail: john_jakubiec at sutd.edu.sg
Design for Climate and Comfort Lab <http://asd.sutd.edu.sg/dcc/> |
profile <http://asd.sutd.edu.sg/faculty/j-alstan-jakubiec/> | DIVA
<http://diva4rhino.com/> | Mapdwell <http://www.mapdwell.com/en>
events: DIVA Day
<http://diva4rhino.com/diva-day/diva-day-2015-registration-now-open> on
daylighting in design, 22-24 October in London | DIVA Day Student
Competition <http://diva4rhino.com/diva-day-2015/student-competition>
On 9/19/2015 4:32 AM, Jones, Christopher wrote:
> zgfDisclaimer
>
> That’s great Nick, thanks.
>
> cid:image003.png at 01D09C46.E75BA0D0**
>
> *Christopher Jones,***P.Eng./
> /Senior Engineer**
>
> **
>
> *WSP Canada Inc.*
>
> 2300 Yonge Street, Suite 2300
>
> Toronto, ON M4P 1E4
> T +1 416-644-4226
>
> F +1 416-487-9766
>
> C +1 416-697-0056
>
> www.wspgroup.com <http://www.wspgroup.com/> //
>
> *From:*Nicholas Caton [mailto:ncaton at catonenergy.com]
> *Sent:* Friday, September 18, 2015 3:59 PM
> *To:* Jones, Christopher; bldg-sim at lists.onebuilding.org
> *Subject:* RE: [Bldg-sim] Radiance Materials database
>
> Here’s one good set of tables to start with – you’ll find google is
> your friend to look up specific material/product properties.
>
> http://www.uncg.edu/iar/elight/learn/determine/lc_sub/mat_prop.html
>
> As a general rule, I was taught for photometrics it’s
> safe/conservative when actual finishes aren’t known to start with
> reflectances of 80-50-20 for ceiling, wall, and floor surfaces
> respectively. That’s representative of typical white ceilings/tile,
> walls of light-to-medium colors, and dark carpet/flooring.
>
> Colored/textured surfaces can be tricky to estimate. Sometimes it’s
> helpful to switch an image or swatch of the color/pattern to grayscale
> to help estimate where on a scale of 0 to 1 the reflectance value
> should lie.
>
> It’s also helpful to be aware of some real-world examples to set
> boundaries:
>
> -Fresh asphalt situates around 5% reflectance (0.05)
>
> -Freshly fallen snow reflectance is around 90% (0.90)
>
> -Most common building materials and finishes should situate between
> those extremes
>
> -White suspended ceiling tiles in particular can range from ~75 to 90%
> reflectance, with higher values typically costing a premium.
> Reflectance is commonly stated on spec sheets and sometimes in
> architectural specifications (that goes for most commercial paints as
> well).
>
> I hope that helps!
>
> ~Nick
>
> *NICK CATON, P.E.*
> *Owner*
>
> **
>
> *Caton Energy Consulting*
> 306 N Ferrel
>
> Olathe, KS 66061
>
> office: 785.410.3317
>
> www.catonenergy.com
>
> *From:*Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org
> <mailto:bldg-sim-bounces at lists.onebuilding.org>] *On Behalf Of *Jones,
> Christopher
> *Sent:* Thursday, September 17, 2015 2:50 PM
> *To:* bldg-sim at lists.onebuilding.org
> <mailto:bldg-sim at lists.onebuilding.org>
> *Subject:* [Bldg-sim] Radiance Materials database
>
> I am looking for some example materials I can use in a Radiance
> simulation for daylighting calculations for LEED v4. The project is
> your typical open office concept with half-height partitions between
> work stations.
>
> The partitions are a white, translucent material. The workstations
> are a wood grain laminate, the walls are flat off-white, the carpet
> tiles are a blue-gray color. I can get the colors from photographs of
> the materials but I am not sure how to estimate the reflectance.
> Also, I am not sure of how to handle the texture of the carpet tiles.
>
> Thanks for any assistance!
>
> cid:image003.png at 01D09C46.E75BA0D0
>
> *Christopher Jones,***P.Eng./
> /Senior Engineer
>
> **
>
> *WSP Canada Inc.*
>
> 2300 Yonge Street, Suite 2300
>
> Toronto, ON M4P 1E4
> T +1 416-644-4226
>
> F +1 416-487-9766
>
> C +1 416-697-0056
>
> www.wspgroup.com <http://www.wspgroup.com/>
>
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