Play Room - Luxrender

I am pretty much a total noob when it comes to LuxRender. I’ve only had it for 3 days. This room started out as just a test for the volumetric lighting on luxrender. Any suggestions are welcome, i have attached the full 2560x1440 image and a down-scaled one with more composting. I rendered it out to about 250 Samples per pixel which took 10 hrs on a core-i5 4.4ghz.


Im struggling with the curtain material. I want them to absorb light from the sun… I set the material type to cloth, and the fabric type to silk, and i found i could give it a ‘Alpha Transparency’ with Alpha Source = Constant, and set it to .91 But its not exactly the what im looking for, they dont seem to absorb any light.

An update