Amazing Job with phoenix FD. Thanks! Wetmaps can be created with help of stoke MX or frost or any other tricks that allow to force particles affect mapping. Enter stoke MX wetmap to see what I mean. It's a plugin, anyway.
Optimizing bubbles is quite difficult I assume. Vray is doing them as sprites internally at rendertime. Octane engine is not suitable, since this is gpu. Vray RT gpu also doesnt support many phoenix features. Actually Octane is better than supporting Phoenix FD now than VrayRT itself.
nl