[Radiance-general] rendering solar tower plant

[Joe]

Hello Greg,

thanks for you help. I made some progress on this and have new questions :)

The image linked below shows three scenarios I tried.

The left image shows heliostats reflecting the sun [source, at 0, 0, 1, 
ring with 0.5°] onto the receiver. This works fine so far.

But I also tried other materials that I would have expected to work.

The middle image uses a white glossy plastic with specularity 1.0 and 
roughness 0.0 . I would have expected to see the reflection on the 
receiver, too.

Same for the right picture, here I used a non-transmitting dielectric.
I would have expected that the complete radiation is reflected.

http://imgur.com/soSzJNe

Do you have an idea what might causethis behaviour or what I might have 
missed?

Kind regards,
Joe