[Radiance-general] Luminance and Incidence angle question

[Greg Ward]

Depending on how your material is translated into Radiance, it either uses an exact formula for glass with an index of refraction of 1.52, or it uses a more advanced approximation than Rivero, which is defined in src/cv/window.cal.

Cheers,
-Greg

> From: "세상살이" <ytwman at hanmail.net>
> Subject: [Radiance-general] Luminance and Incidence angle question
> Date: September 12, 2014 5:38:02 AM PDT
> 
> Dear all
> I'm worked Luminance analysis.
>  
> but, I saw Rivero formula. so I have question.
> 
> According to Rivero formula varies transmittance of the incidence angle.
>  
> Therefore, it seems to change the reflectance&transmittance of the incidence angle.
>  
> [Rivero formula, T1 = 1.018T2(Cosθ+sin^3θcosθ), T1= transmittance of the incidence angleθ, T2= transmittance of the perpendicularly incident]
>  
> According to my results
>  
>  - Simulation summary -
>  
> [Glass material from optics6(NFRC ID 6974+6957), transmittance 0.5022, Reflectance(front) 0.178]
> [Date : June 21, 19:05 , Incidence angle[deg] : 83.244 ]
> [Latitude(deg) : 37.225 , Longitude(deg) : 127.07]
> [Sky : clear sky ( +s)]
>  
>  - Simulation result-
> Sun Luminance : 295,473,152 cd/m2
> A spot Lumimance(Specular reflection) : 52,734,259 cd/m2   |   B spot Luminance(Specular reflection) : 52,734,259 cd/m2
> A spot/Sun : 0.1785 , B spot/Sun : 0.1785   
>  
> This Reflectance ratio is similar of the glass material.
> I did the simulation proceeds properly?
> Is the angle of incidence of the light is applied?
>  
> Kind regards,
> Tae Wook
>  
>  
>  
> 
> 
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