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The Simulation rollout contains the main panel for controlling the simulation process. It also displays statistical information for like simulation times, and the content of the cache file for the current frame. The content can be grid channels such as Temperature, Velocity, etc., as well as particle groups. You can select which channels are exported to the cache file files from the Output rollout,  while while the particle groups are automatically created by the Simulator.

Many simulations require a long time to calculate and it's very convenient to let them run during the night. However, you still have to render the result in the morning, and this also consumes a lot of time.  Phoenix provides a scripting system that allows In this case, the Phoenix Scripting system can be helpful, since it enables you to execute any action at the end of the simulation, including rendering. You just have to enable the scripting from the Simulation rollout simply need to enable "Use Script" from the Simulation rollout, and open the script text.  For For more information, see the Nightly Simulation and Rendering section on the Tips and Tricks page.

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Start, Pause, Stop, Resume | A_StartSim, A_StopSim – Starts, pauses and stops the simulation. Once the simulation has been paused, the option to Resume becomes available. Note that you can stop a running simulation using the Shift Shift+Escape Escape key combination, or with the the Escape key, if the option to do so is enabled in the PhoenixFD Global Preferences.

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Load
Load
Load & Start | A_StartSim – Loads the data from a single cache as an initial state for the simulation and starts simulating from the Start Frame the same way the Start action works. The cache can be of the .aur, .vdb, or .f3d formats and so can be imported from a 3rd party software into Phoenix. The loaded grid will be resized to fit the grid's dimensions at the Start Frame. The loaded cache does not need to be a Backup frame or to contain velocity at all - the simulator will load any available channels from the cache file and the rest of the simulated channels will be empty as when starting a brand new simulation. If you wish to smoothly continue a simulated sequence from a given frame, please use the Restore command instead.

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Restore
Restore
Restore | A_StartSim – Continues a simulation from the currently viewed frame on the timeline, or the most recent latest Backup frame containing the full simulation state up to the current timeline frame, which is controlled by the Backup Interval parameter in the Output rollout. This way, a Phoenix simulation that has been stopped previously can be resumed from the point you left off, even after the software has been closed and reopened.

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The ability to restore a sim is only possible when the full internal state of a Phoenix simulation has been exported. This is controlled by the Backup Interval parameter in the Output rollout, which determines how often the full simulation state is backed up. Frames with the full state are called Backup frames.

When a Backup frame is currently viewed, the text "Can Restore From Here" appears in the Cache File Content list. The Restore command finds the latest Backup frame up to the current timeline frame, and continues the simulation from there. Note that restoring does not work for cache sequences imported from 3rd party software.

Get Tutorials – Opens the Tutorials and Examples page in the web browser.

Phoenix Help – Opens up the help documents for the Fire/Smoke Simulation.

Simulation Presets... | A_LoadRenderPreset – Displays a drop-down menu to either load or save .tpr or .slog files, which hold settings for this simulation.

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