Simulating

There are two ways to simulate RealFlow | Cinema 4D scenes:

Viewport simulations are used to adjust parameters, fluid-object interaction, control forces, and the fluid's motion. After this process, the simulation is cached (see below).
This type of simulation does not store any data, but you are able to control the simulation's progress in Cinema 4D's viewport. Just hit the "Play" button to start.
To interrupt a viewport simulation you can press the "Pause" button, but we recommend using the F8 key instead, especially with heavy simulations.
As long as the frame is not changed after an interruption it is possible to resume the simulation.
Viewport simulations cannot be played back, because there is no saved ("cached") data available.
It is possible to create → meshes during viewport simulations, but the meshes will not be saved either.

The second method saves the simulation's particles and mesh data to disk. This process is known as → caching.
In order to cache a simulation go to Scene > Cache and specify a path where the files will be stored (see image below).
Press "Cache Simulation". The simulation's progress will not be displayed in the viewport, but you can see a progress bar instead.
Once the simulation is finished it can be played back. If you want to change anything, disable "Use Cache", adjust the viewport simulation, and cache again.
As long as you do not specify an alternative path, previously saved files are being overwritten when you start a new cached simulation.

To change the simulation range or FPS rate use Cinema 4D's render settings (Ctrl/Cmd + B), project settings (Ctrl/Cmd + D), or the timeline.
Scale can be changed in the project settings (Ctrl/Cmd + D) under "Project Scale". Scale changes affect your simulations and you will get different results.