Can fluids ignore back facing normals

[Raven]

I know it was possible with realflow, is there a way to get Phoenix to ignore back facing normals of an object.

Basically I want to do a pack shot forming from pouring fluid.

[Svetlin.Nikolov]

Negative - perhaps we could add a mode where each wall is just treated like a sheet with a thickness of several voxels, but right now Phoenix needs the normals in order to know what the volume of a shape is.

Would it be possible to share how your geometry looks?

[Ivaylo Katev]

the normals are important because they are the only difference between these situations:
- i want to simulate only inside the sphere (spherical room)
- i want to simulate only outside the sphere (spherical rigid body)
if course this can be resolved by explicit option, but it can't be implemented fast, would require good testing, our experience shows that this kind of functionality is very tricky.

[Raven]

Hi Svetlin

The packs geometry may vary. So basically I want to be able to have my packs geometry with no wall thickness, just inverted normals.
So the liquid can be poured into it, but once inside the geometry it cant escape.

I have tried doing it with a cascade, but get strange results when I have the closed geometry. I'll post those results a bit later.

Thanks

[Svetlin.Nikolov]

This is a very interesting problem. Have to try and reproduce it with cascade, but there would at least be artifacts where the grids join...

[Raven]

Hey Ivaylo
I assume it is because it is grid based it determines where geometry is all the time.
When I did it with realflow it was quite a few years ago, so was just the standard particle solver that they used.
I guess the particles could determine the normal direction only when they encountered the geometry.

Hi Svetlin
So here is the problem I'm having with using cascade.
Works well if the top of the box remains open, but when it is closed as I need it, the flow breaks up at the cascade source.

Any suggestions on how to achieve the effect another way.

[Ivaylo Katev]

i see now i got it wrongly, you are not asking to ignore the normals in order to use bad geometry (in the most cases the meshes are bad), you are asking for single direction conductivity.
perhaps we can modify the border conditions to make it possible, but this seems to be very rare case, newer supposed that one may need such a functionality.

[Raven]

Hey Ivaylo

It would be great if it could be done.

In the past I have used it a number of times to create soap bars, and pack shots.