Hi Devang, see this. Other than that, the original instructions for rpict still apply.
If you want to test BSDFs before generating them, you can find a few examples in the blinds directory. Since you intend to look at the blinds, I would suggest sticking to TensorTree BSDFs.
The unmethours post is a good one. I am aware of radiance options page. I have tried a few combinations but it got me no where. May be I need to keep trying. I see your point about using BSDF and I am looking into this.
My understanding is, using a BSDF may give more accurate illluminance results since it addresses the issue of rays getting lost in a CFS, but it will not take me close to the rendering that I posted from one of the Jan Weinold’s presentatons, would it?
Also, if you end up going a route of simulating the shade geometries, you should use the ambient resolution component, which gives you the ad that you will need to resolve the shades (given the size of your scene in HBObjects and the aa):
I discovered this post a little late, but @devang I’m curious to know what was the end result? Also, did you look into Proxy geometry / sandwich BSDF route? Here’s a presentation from one of the old radiance workshops about it. Slides 31 - 39 are the ones that talk about it.