[Radiance-general] using transdata for roller shade simulation

[Greg Ward]

Hi Anna,

The transdata (and transfunc) materials do not fully model material behavior as well as the newer BSDF type (or even BRTDfunc).

I have a few models of roller shades, which you might be able to modify to your purpose.  I do not (currently) have any measurements to offer.

Best,
-Greg

-------

# Shade material s99745 by Mechoshade, white facing front (inside)
# Measurements by Mehlika Inanici & Judy Lai 9/20/2004
# Diffuse measurements by Mike Rubin 10/7/2004
void BRTDfunc Mechoshade99745
10
	0 0 0
	.02*tspec .02*tspec .02*tspec
	0 0 0
	shade.cal
0
11
	.628	.628	.628
	.377	.377	.377
	.0225	.0225	.0225
	56	68

-------------

# Shade material #1 by Mechoshade
# Measurements from Steve Hebeisen <steveh at mechoshade.com>
void BRTDfunc Mechoshade6020
10
	0 0 0
	tspec tspec tspec
	0 0 0
	mechoshade.cal
0
9
	.37	.37	.37
	.56	.56	.56
	.03	.03	.03

--------------

# Shade material #2 by Hexcelshade
# Measured from sample 11/3/2003
void BRTDfunc HexcelshadeS065
10
	0 0 0
	tspec tspec tspec
	0 0 0
	hexcelshade.cal
0
9
	.26	.28	.30
	.59	.61	.60
	.02	.02	.02

-----------



> From: "Atzeri Anna Maria (Student NaTec SusEn12)" <AnnaMaria.Atzeri at natec.unibz.it>
> Subject: [Radiance-general] using transdata for roller shade simulation
> Date: May 7, 2015 12:54:12 PM PDT
> 
> Hi all,
> I’m a pretty new in Radiance use and I’m thinking about the possibility to use transdata in order to simulate a roller shade.
> Looking into the mailing list, I found some post in which has been suggested to use the trans material to simulate roller shades, but doing so I would lose the directionality properties of the real material.
> If I’m not wrongwith transdata I should be able to change the A6 parameter, through a .dat file, according to the different values of beam-beam transmittance at different incidence angles.
> I know that it’s not possible to do the same thing with the beam-diffuse component, so I would have thought to express Td, diffuse transmissivity, as the sum of diffuse-diffuse plus beam-diffuse transmittance, the latter calculated as an average on the incidence angles. 
>  
> Does it make sense for you?
>  
> Best regards,
>  
> Anna
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