Slow motion liquids

Phoenix General
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1

Hi,

We’ve got a project coming up where a liquid simulation (splashing) needs to be seen at about half or less speed. What’s the best way to achieve this? I understand the time scale value doesn’t work so well with liquids, so is there something I could do with playback speeds? Or frames per second?

So to put this question in the context of the project; I have an object emerging from an Initially Filled up grid. The object emerges in 1 second and I like the way the splashes look.

Supposing I need this to take 2 seconds, how do I do that? If I animate the object emerging over 2 seconds the splashes are no where near as violent (as expected)…

I just want the splash that took 1 second to generate but at half speed. Is this even possible?

Any ideas welcome.

Thanks.

2

reverse the task - create the slower 2 sec simulation that looks good and then use play speed=2 in the input panel, you will have perfectly scaled result. the integer play speed values actually just skip frames, this is much better than interpolating frames to generate the intermediate one.

3

Thanks Ivaylo, I’ll give this a shot on Monday and let you know… :slight_smile:

4

Hi Ivaylo,

After thinking on this one, isn’t setting the play speed to 2 going to speed it up rather than slow it down? I need the 1 second sim to last 2 seconds.

Am I misunderstanding?

I don’t understand the process of using the Time scale slider. Do I need to animate objects interacting with the water at a normal speed or a slow motion speed?

For example, could I animate the object emerging from the water in 2 seconds, simulate with Time-scale at 0.5, and then speed up the rendered frames 2x?

:slight_smile: Thanks.

5

if you set the time scale to 0.5, the water dynamics will be twice slower. if you render this with play speed=2 you will get normal water dynamics, because they cancel each other.
so, in this way you can have normal speed, and half speed, but avoiding the frame interpolation.