There seems to be a bug/issue with using volume collisions in the white water solver. The solver seems to grab the next frame to use as the collision for the current frame, resulting in a gap between the collision and the collider. This issue doesn’t happen with the flip solver, only the white water solver. I am including a photo and a video of the issue along with a hip file.
In my video, notice the gap between the white water particles collision and the collider. If I use a timeshift to shift it back 1 frame it actually matches perfectly. In my video you see the issue go away if I force the white water solver to use geometry collisions instead of the default (volumes).
You can try it for yourself in my hip file. I have two setups in the hip file, one DOP setup, and one using the new SOP flip workflow. Both workflows have the same issue. I am using the same collider for the flip sim and the white water. It works fine in the flip solver. Any tips? Maybe I am doing something wrong?
video of issue: