[Radiance-general] Trans material

[Greg Ward]

Hi Per,

You should not be seeing straight through the surface.  I did a test using your parameters, and could not see through such a trans material.

Are you sure that what you are seeing is not the shadows cast by the beams?  Have you double-checked your geometry to make sure all the materials are correctly assigned and the surfaces where you expect them?  What happens when you substitute an opaque material for the trans?

-Greg

> From: Per Haugaard <perhaugaard at yahoo.dk>
> Date: January 21, 2013 11:57:34 AM PST
> 
> 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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