The only other mention is a post here from a few months ago saying that the poster would like to see that feature added to RPR in the future.
#BLEDNER MAKE VOLUMETRIX FOG CLOUDS HOW TO#
The only ProRender videos even mentioning volumetrics, are one from 2018 using blender 2.79 and although the title says "How to use volumes to make smoke mist or fog" it really just shows how to make a smoke sim and render it properly in RPR. Thanks to Blenders cutting edge Eevee render. I have searched high and low online for three days and cant find any more information pertaining to it, other than what I already mentioned. Even though volumes require notoriously long render times with Cycles, Eevee makes volume rendering practical. All I know is that I set it up the only way I know how, using the Principled Volume Node, in the world node editor in Blender, and it renders the volume just fine in both the viewport, and final renders using cycles, but the same setup renders with absolutely no volume properties visible at all in either render using RPR. I first tryed with volume scatter on world material, then with volume scatter applied to a cube that contains the crystals, but the result is really really noisy. We studied different types of clouds to nail down the realism. I set up the volumetric material (volume absorption + emission with a glass surface) for the crystals, but I wanted to experiment with some fog too. It also appears they have used such volumetrics in there latest "Rainbow Mushroom Crashed Rocket ship" scene on there pages for the RPR 2.0 release. In volumetric lighting, the light cone emitted by a light source is modeled as a transparent object and considered as a container of a 'volume': as a result, light has the capability to give the effect of passing through an actual three-dimensional medium (such as fog, dust, smoke, or steam) that is inside its volume, just like in the real world. This product has 100 incredibly realistic clouds in a VDB format which you can load into any render engine that supports them such as Blender, Octane, Redshift, Arnold, Houdini, Cycles and many more. Controls how much the participating media blocks light.
![bledner make volumetrix fog clouds bledner make volumetrix fog clouds](https://i.stack.imgur.com/pgDRq.jpg)
![bledner make volumetrix fog clouds bledner make volumetrix fog clouds](https://i.ytimg.com/vi/AXjE-t6dFZ8/maxresdefault.jpg)
The release notes, and official pages on AMD ProRender site says it can render volumes like "fog, mist" although it also has one reference to it maybe being a "workaround" and could be "Blocky" looking. Clouds, fog, and mist, which are based on water particles, have an Albedo close to 1.