Volumetric scattering is pretty simple to set up in LuxRender. When all materials/objects are inside the volume that makes it super-easy when you can use the scattering volume as the default volume, which makes LuxRender use that volume on all materials/objects.
Keeping track of the face normal is important when picking the exterior or interior volume for a material.
This was made for the Organic competition in the LuxRender forums. The entries had to be … well, organic, but also something new which doesn’t exist. The idea of a flower letting go of its spores came pretty quickly.
It puts some new features of LuxRender 1.3 to use, such as instanced area lights for the emitting parts of the spores. It also uses the new heterogeneous volume to create the background clouds. Heterogeneous volumes are nasty to render but they sure are beautiful. In this one it covers the entire image, and the render also has a homogeneous volume for the sun rays, so this one will have some longer render times.
Download blend file
4MB, modeling: Blender 2.69, rendering: LuxRender 1.3