Rendering fluids setup

[CANDITO]

Hello,

i'm new to Octane for Blender (I'm coming from Lightwave
and switching some of my work to Blender since a few weeks)
I'm struggling at rendering fluids with Octane,
they just don't appear at all.
I tried to put them in global/reshapeable proxys etc...
but no fluid meshes shows up, the rest of the objects renders fine thought.
Thanks in advance for any help and advice (i'm using the last release 2.90.1)

Olivier

[pegot]

Do you have a sample file to upload?

[CANDITO]

Hello,

here's the file, nothing fancy, just a quick test.
I didn't put the cache files, the simulation just takes
2 mn to compute.
Thanks a lot for your help !

Olivier

[pegot]

A very puzzling issue! I could not find any Octane settings out of place (note that the Mesh settings are generally most relevant for animation, but no single frame of your fluid is rendering at all – either in viewport or final render).

My own quick Mantaflow Fluid sim test in another file worked fine.

Your file renders in Eevee and Cycles but not Octane. I would ask the Devs to take a look at your file as I can’t find anything immediately amiss.

One thing you could do though is export the fluid sim as a BLENDER Alembic file. Import that into a new project and it will render fine in Octane. Do note that exporting the scene as Octane Alembic (or ORBX) will not work – so there is definitely something on the Octane side which doesn’t like this simulation.

[CANDITO]

Thanks a lot for your help !
i will try the alembic export,
Cheers

Olivier

[CANDITO]

It works fine with the Alembic,
thanks again !

[pegot]

Your welcome. I'd still very much be interested in learning what caused this problem though - can devs tale a look?

FYI: I haven't used the Mantaflow Blender fluid system much at all as I primarily used the Flip Fluids plugin. Off the cuff I'd have to say Flip Fluids seems a bit faster and more responsive - at least you can see the simulation progressing frame by frame as you used to in the old Blender fluid sims. I can't seem to be able to do that in Mantaflow - though maybe I don't have the right settings.

[CANDITO]

Hello,

thanks for your feedback, i tried with another simple
fluid simulation and it still doesn't show in Octane.
I put some foam particles this time, and these are correctly
rendered (as particle/object with a UV sphere as reference)
so there's definitely something going on with the fluid itself.
Thanks to the devs for their help on this.
Cheers

Olivier

[linograndiotoy]

We'll fix the issue.

[CANDITO]

Thanks Lino