liquid sim object options

[ttdww]

In build 26374 I'm seeing there are 2 types of sim objects: fire/smoke and liquid - very cool (i'm coming from an older build so perhaps they've been split for a while). i'm wondering if the options for conservation and advection will be put back into the liquid solver or is there only 1 option now. if i've jumped the gun and those are coming, apologies.

[Ivaylo Katev]

the conservation is smooth and no planning other types to be used, the advection is particle based because this is the idea of the flip solver. in general it's bad idea to use technical parameters like advection, conservation, etc.

[ttdww]

this reminds me of losing the jacobi solver for fumefx, which was able to obtain some behaviors that the cg solver could not, even if it did lack in expandability. in Phoenix, I tend to switch between methods depending on the liquid behavior needed for a given project. would be great if those abilities could be retained even if they are problematic in some regards. if nothing else, at least retaining the advection options. O_o

here is one example where i couldn't get the same result using the flip solver and went with multi-pass.

[Ivaylo Katev]

the smoke is more sensitive to different solver, for the liquid there is no big difference.
the reasons to remove them is that they are confusing the users, and the most important is that the big variety of solvers is an indirect reason for lowering the product quality, because they require different boundary conditions (very important part) and we dissipate our efforts instead to have one solver but with maximum polished boundary conditions.
the advection method (switching to the old solver) is still available and will be not removed soon, but there is no UI to create old solver, you have to open old scene or to use script

[ttdww]

i understand regarding programming efforts, however unless that scene in the multi-pass image can be recreated using the flip solver (or close to it), it seems that capability is being removed by only having access to the flip solver. i simply could not get the same liquid behavior using flip. if i supply the wave scene above, and it can be adjusted to behave like the multi-pass solve, and in the same sim time, then i'm totally on board with only have access to flip. otherwise, it would be great to still have the advection choices, even if they weren't further developed. i understand the need to simplify choices for the users, but they should learn the tool and which features to use for which effect type they want. as you can tell, i'm really hoping (begging?) the advection choices aren't removed in the future O_o

[Ivaylo Katev]

you can use the old solver, it's not removed, just hidden. we were sure that some users will pursue behavior that the old solver can achieve better, it's a rare but existing case, so we didn't remove it.

[ttdww]

great news! maybe an option to set a pref value from 0 to 1 to reveal advection? ok, i'm probably pushing it. sorry. ;]