From the video page:
In this tutorial, I’ll walk through the process of modeling and rendering a sunlit room with Blender 2.5 and LuxRender 0.8, from start to finish. I’ll cover:
1: How to quickly make a windowed room
2: Setting up exit portals to help LuxRender “find the sun”
3: How to configure window glass to be quick but realistic (in thin sheets anyway)
4: Adding scattering to the air for “god rays” coming in from the windows, and how to configure the render settings for this
5: Modeling, sculpting, and and texturing a simple beanbag chair.
6: Polishing up the render with LuxRender’s lens effects and film response features.
You will be making this:
.blend file here: http://dtc-wsuv.org/jclarke/luxrender/dust.blend.zip