Hello,

We're having a problem combining FLIP Simulation Distribution and Narrow Band.

We have setup a simple simulation to demonstrate this, using the Houdini Shelf FlipTank and a SOP Level Flipsolver.
In both cases, distribution functions when Narrow Band is OFF.
However, both cases fail when Narrow Band is ON. There is a small gap where the slice plane was placed - a gap smaller than the overlap region.
I have attached images to demonstrate the issue.


Here you can see the results with Narrow Band OFF:


Before the 'isolate_slice' Attribute Wrangle node, in the automatically-created 'distribute_fliptank' setup.


After the 'isolate_slice' Attribute Wrangle node.

Sending this to our Farm works as expected.


However, here you can see the results with Narrow Band ON:

Before the 'isolate_slice' Attribute Wrangle node, in the automatically-created 'distribute_fliptank' setup.


After the 'isolate_slice' Attribute Wrangle node.

Sending this to our Farm results in a very small gap where the slices meet, which is smaller than the overlap region, as you can see below:




Here is an image of the node setup in the DOP Network:



Flip Object:
Particle Separation 0.02
Particle Radius Scale 1.2
Grid Scale 2

Narrow Band (FlipSolver):
Narrow Band Bandwidth 7

Distribution Control Null:
Slice Overlap 0.05
Particle Overlap 0.05



Is there a change we need to make in the node setup when using Narrow Band? Is Narrow Band even an option when using Distributed Simulations?

Many thanks for any help and time!
- Lucas Thorley