Houdini pyro to Vray Volume Grid limitations

[JkolerMTH]

I'm working on matching a pyro sim (.vdb) from Houdini in Vray using VRayVolumeGrid. I've achieved pretty successful results in getting the shape and look but have hit a brick wall in getting that last 10% of the way there for an almost one to one match.

I've found this to be because of the limitations in the VrayVolumeGrid for utilizing all the field data coming out of Houdini. In my particular case I'm driving the fire using the heat field. I'm missing out on the color/gradient information from the temperature field because there's no way (I can find) to utilize multiple fields in Vray. This is stated in the docs, and there is the option to get the fx artist to multiply the fields together and export as a single channel but that's not that ideal.

I was wondering, is there anyway to do this in Vray I'm just not finding without having to go back up the pipe multiple times? and if not can we please get some more functionality? It would be great if there was a way to be able to load each field independently, do the math/manipulate as needed, and then plug it back in the 3rd party channel mapping. (i.e. load heat and temp separately, multiply them together, plug result into 3rd party mapping). Saves a lot of overhead in the pipeline to if we have more look-dev control in lighting/rendering and the added functionality opens up the possibilities a lot.

Thanks

[georgi.zhekov]

Hey,

Unfortunately this is not possible when using V-Ray but you can do that by using Phoenix FD.

You can extract a channel using the Phoenix Grid Texture for each one that you like then multiply them together and use the result.

Cheers,