[Radiance-general] Sampling thorugh TRANS material

[Germán Molina Larrain]

Hello everyone,

I have a question about trans material... The story is the following:

   1. I already read what Axel Jacobs has to say about Trans, read the
   Radiance Reference Manual and also Googled a bit.
   2. After all that, I found out how to model Fabric materials using Trans
   (I need some uncolored specular transmission and a bit colored Diffuse
   transmission). After the research, I noticed that Trans, as I wanted to
   model Fabrics, would only work for gray textiles... but that is good enough
   for me.
   3. I managed to do all that, and actually run genBSDF to check if the
   diffuse and direct parts were OK.... they came very close, but not quite
   perfect, even if my parameters were pretty high.
   4. Assuming it was as good as it would get, I continued with my
   simulation... I am using rcontrib's 2-phase method, with "-ab 12 -ad 4096
   -aa 0.1" parameters... but I get some NOT SMOOTH results. LINK TO PICTURE
   <https://drive.google.com/file/d/0B2NfkTSl19hQSF9rbTF4S0tMWXc/view?usp=sharing>

Any hints on the parameters I have to use in order to model this product
well? Is this caused by the fact that there is no direct light in the
calculation of the DC matrix? Will my approach work?

Regards,

Germán
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