[Radiance-general] transfunc with measured data (poor man's BSDF)

[Greg Ward]

Hi Stephen,

You got that working pretty quickly!  Can you send me a private message with your .cal file and commands, so I can reproduce the issue?

Thanks,
-Greg

> From: Stephen Wasilewski <stephen at coolshadow.com>
> Date: May 17, 2016 2:12:18 PM PDT
> 
> Thanks Greg,
> 
> bsdf2klems is doing what I wanted perfectly but bsdf2ttree is doing something a little weird.  I used t4 just so I could view the output with Andy's BSDF viewer and when I run it with the defaults the "front" in the BSDF viewer (which i think is made from +backward with bsdf2ttree) looks good, but when I include +forward the "back" transmission is too high.  This does not happen with the klems bsdf.
> 
> The hemispherical transmission for a normal ray is 75% for both klems directions and ttree front, but ttree back is 91.6.  Any idea whats going on?  I can probably get around this by paying attention to surface normals, but I am looking at a multi layered assembly where I expect backface reflection and transmission to matter.
> 
> Thanks,
> 
> Stephen
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