Just had a quick go at trying out the volumetrics, the rendering speed is already quite nice! I created a burning object using PFD and pressed render and that just worked fine :)
Some things that stood out, most of the WIP I guess:
-Ability to be lit seems to be missing, it's lighting the scene but I can't light the smoke with corona lights.
-interactive render doesn't pickup many of the scene changes yet (time scrubbing, volumetric rendering settings etc).
-alpha seems to be always 100% transparent
-And a grid of omni lights appears during inter active rendering, I think those should be hidden/out of view.
I notice that for the look and feel of the rendering Corona is using PFD's volumetric settings, will it eventually get some sort of corona-native way of doing that for generic (openVDB) volumes? They can have arbitrary named grid and such that need to be mapped to various shader properties, ideally using curves and gradients etc.
Anyways, great work and exciting to see all this taking shape!
edit: Very nice to see DOF working on this as well!