How can i get smoother, less bumpy liquid sims?

[lukepenry]

I seem to run into this problem quite often, the sim is very stable and works as expected but it always suffers with a mildly bumpy surface.

This doesn't look too bad in a final render still, but in motion it's very noticable.you can see it quite clearly on the left side of the final image, and even cleaer in the viewport screenshot.(i am not talking about the bump where the liquids join, just the overall surface where it is spreading outward)

Thanks!

[Svetlin.Nikolov]

Hey, apart from the Rendering rollout's Mesh Smoothing, you can also add smoothing of the Liquid/Temperature channel from the Input rollout (don't forget to zero the randomization), and on top of that, you can also throw in a relax modifier over the mesh - these 3 methods can be combined in any way.

[lukepenry]

Thanks for the quick reply!

I will try the first 2, i have been using the Relax modifier but it removes too much detail and gives me bubble artifacts.

[lukepenry]

I am not seeing any changes when setting the smoothing to the highest possible setting, am i doing something wrong?
this is a post simulation algorithm isn't it?

Thanks

[Svetlin.Nikolov]

Ohhh, don't boost the Similarity - zero it instead. Here's an excerpt from our docs:

"Similarity | smoothtemp.y, smoothsmoke.y,smoothuvw.y,smoothfuel.y – Increasing this value will allow you to smooth only the finer small-scale noise without changing the areas of the fluid which are already smooth. Note that just like the Threshold option, this value also depends on the range of the selected channel. If you want to remove only some sharp fine disturbances from the simulation without blurring other areas, set the Threshold to 0, increase the Similarity to the highest values the selected channel can take and then start reducing it until the small-scale noise is removed, while the larger fluid shapes are retained."
https://docs.chaosgroup.com/display/...X/Liquid+Input

[lukepenry]

Ah yes! Thank you. It has helped somewhat, that's a good tip. Any advice on things i could do during simulation to get any further smoothing?

[Svetlin.Nikolov]

Hey, sure - during simulation more Steps Per Frame will make for smoother liquids, and also cheating the scale by increasing the Scene Scale under the Grid rollout will help as well, though it will change the behavior of pouring liquid - it will pour slower..