The parameters you can see under “Options...” are the standard values for each new RealFlow. They can be overwritten to increase or decrease the defaults for the individual needs of your current project. We recommend determining the settings under “Preferences” globally and then altering them with “Simulation options” an a per-scene level. To open the “Simulation Options” dialogue, please click on the small triangle next to the “Simulation” button and choose “Options…”.
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General
All values from the "General" section are global settings and should only be set once as long as you do not want to make fundamental changes. If you want to adjust these parameters on a per-project basis, this should always be done under “Simulation options”.
FPS Output
This value normally only needs to be set once and changes should always be made under “Simulation options” on a project level. The default value is 25, suitable for the PAL format.
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This is the particle fluid solver's upper limit of time steps. The final used number of steps will be between both values. In many simulations it is required to work with higher “FPS Output”. With higher settings, e,g. 100 FPS, you will most probably receive an error message, telling you that your “Choice of MAX substeps is too large”. Fortunately, the error message tells you the maximum substep you should use for the current settings directly, but you can also ignore this tip and start your simulation, though this may result in longer simulation times.
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Stop simulation on write error
When this checkbox is active RealFlow will stop the current simulation if it encounters write disk errors. This mainly happens when a disk is full and RealFlow is not able to store simulation data. A positive side effect is that your computer will not waste energy or resources when the simulation is aborted. You should enable this feature when you export Alembic data, because RealFlow might crash when there is no space left to store the ABC files.
Disk overflows can also be avoided with alternative paths under “Export Central”. With this feature, simulation files will be written to one or more alternative locations if the primary drive is full.