When a fluid is poured into a glass or any other container you will see an up and down motion for a certain amount of time. A little later, the fluid comes to rest and forms an even surface. RealFlow mimics this behaviour, but it can take some time before the fluid is totally calm. During this time you can observe the fluid sloshing and moving. One method is simply to sit and wait until the fluid has relaxed, but this can be a very time consuming task. It is much better to support this process with RealFlow's “k Speed” daemon. Please bear in mind that this approach is suited for standard particle emitters. Hybrido fluids do not have to be relaxed.
A sloshing fluid and its relaxed state created with the method described here.
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To create a calm and even surface, please follow these steps:
Start the simulation without the influence of the “k Speed”
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and "Drag Force" daemons.
- Fill the object until the desired water level has been reached and let the simulation run for a few more frames.
- Set the emitter's “Speed” parameter to 0.
- Create an initial state and activate “Reset To Initial State”; reset the scene.
- Add /Or activate the a “k Speed” daemon.
Set “Limit & Keep” to “Yes”.
- Create two animation keys for “Max speed” with values of 1.0 (frame 0) and 0.01 (frame 200)Node Params > k Speed > Limit & Keep > Yes
- Max speed > 1.0
- Max speed > right-click > Add key
- Shift the timeline slider to frame 200 (the fluid disappears).
- Max speed > 0.01
- Max speed > right-click > Add key
- Reset (the fluid reappears).
- Add a “Drag Force” daemon.
- Under Drag Force > Drag Strength create two keys with values of 0 (f = 0) and 75 (f = 200).
- Simulate. At frame 200 the fluid should be calm and relaxed.
- Create a new initial state for your final simulation (see below)as described above.
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- Reset.
An initial state can be saved easily:
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