Can anyone help ?

[Paul Oblomov]

Just in case, there's somebody willing to help me
http://forums.odforce.net/topic/2109...-to-phoenixfd/

[Svetlin.Nikolov]

What is the question here? Did you manage to export vel.x/vel.y/vel.z from houdini and load it as initial frame in Phoenix and if not, what happened?

[Paul Oblomov]

I can't figure out what should I export as velocity.

[tsetso]

Not really sure that I fully understand, but if you have the Pyro FX, you can go inside the import_pyro_build node, there are 2 DOP import nodes, import_pyrofields and import_pyro_visualisation.
Import_pyro_visualisation contains the density, heat and temperature grids. Import_pyrofields holds the same grids + additional fuel and velocity grids.
If you middle mouse over that import_pyrofileds, you should see the vel.x, vel.y, vel.z or any other data (advection parameters) that you have generated.
Then you can create Convert VDB node and connect it below the import_pyrofileds. Select the convertvdb1 node and set the parameterers for conversion (use the arrow to the right of the Group) and change the Convert To to VDB.
Connect a file node to the convertvdb1 and change the File Mode to Write Files, set the file path (path/filename.$F4.vdb) and play through the sequence to write out all the files.

You can then load the .vdb data from the Input panel of Phoenix FD and check the Velocity channel in the Preview panel. However I'm not sure that you can restore simulation using .vdb file, even if it has the Velocity data inside.

[Svetlin.Nikolov]

Restore will not work, because Phoenix looks for a backup marker that it puts in it's own simulations, but Load & Start is possible - it will just start from the vdb and then carry on as a purely Phoenix simulation. Also, there is the possibility to use the velocity from the entire vdb sequence as a driving force for the Phoenix simulation - you can resimulate from a vdb with velocity (setting resim conservation to 0 and if you don't want to increase the resolution - amp. resolution = 0).
However, which Houdini fields should be exported as velocity is purely a matter of experiment IMO...

[Paul Oblomov]

I have a cloud, made of volume + noises. It is not a pyrofx at all. Maybe I should try to convert it somehow to pyrofx, and then to vdb with velocities, that I'll get from pyro fx, then somehow find appropriate channel, inside noise I used to create my initial cloud and export it to vdb....

[Paul Oblomov]

While still searching for a way, to export vel attributes


1559x882x1452

1 996 555 176 cells

[Paul Oblomov]

I gave up on exporting...
Hybrid technique works quite good. 10millions of cells, converts to 100million one from H.