hi all, using the FLIP solver SOP upressing workflow in the documentation doesnt work for a river sim. Apparently Igor Zanic managed to make it work in the H19.5 demos but I have been stuck for 3 months now.

here is a simple example of my problem:

- I am upressing from 0.2 particle separation to 0.1
- very simple setup of a box emission in the low res sim colliding over a terrain
- result of original FLUID solver is used in 4th input of the upres FLUID solver
- this is similar to the documentation example: https://www.sidefx.com/docs/houdini/fluid/sopupressing.html [www.sidefx.com]

You should use output of compressed as your input of upres solver input3, not from solver. solver get wrong primitive, so it can't create current source and boundary fields.

Can you post what you've got? I can't figure out the instructions in the help, and your screenshots are too blurry to make out..?