[Radiance-general] Trans material

[Per Haugaard]

Dear list,

Yet another question on the trans material.

The question is on the design of a roof in an exhibition hall. The first layer is facing the outside air, the next layer is approx. 20cm below and the third layer is another few meters below. All 3 layers are built up the diffuse transmitting glass.

We have built all 3 layers of glass with material Trans, cf. the data below: 

Cr Cg Cb Rd Rs Sr Td Ts 
0,1 0,1 0,1 0,1 0,08 0,02 0,5 0 
A1 A2 A3 A4 A5 A6 A7 
0,65 0,65 0,65 0,08 0,02 0,83 0,00 

The rendering parameters are (in ecotec):

-dp=512
-ar=22
-ms=0.74
-ds=.3
-dt=.1
-dc=.5
-dr=1
-sj=.7
-st=.1
-ab=12
-af=RCP.amb
-aa=.2
-ad=400
-as=64
-av=0.01 0.01 0.01
-lr=6
-lw=.002

My question is when rendering the scene and looking up towards the roof you can see right through the panes as they are not translucent but clear glass. One can clearly see outline of the top window and connection between the roof and the walls which is rather unexpected.

Are there a logical explanation for this or what could be the case here? Should I have modeled the inner layer as an illum source?

Any input is appreciated :)


/Per
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