Append to an existing Bifröst user cache

You can extend the frame range of a simulation, then append newly cached frames to its existing user-cache without having to recache the entire simulation. To append to an existing user cache, Bifröst needs to read at least one previously cached frame before it can accurately simulate the extended frame range. See Create a Bifröst user cache.

Append using the Bifrost Compute and Cache Options

1. Select the container for the simulation that you want to cache.
2. Select Bifrost Fluids > Compute and Cache to Disk > .
3. Set Write Mode to Read/Write.
4. Make sure that other settings are as desired.
5. Click Create.

   Bifröst reads the existing cached frames, then computes and saves the extended frame range to the user cache.

Append by playing back manually

1. Set all the appropriate Cache Control attributes to 3 (for Read/Write mode). Depending on your simulation, this may include settings in the Caching attribute groups of the following nodes:
   • liquid properties
   • guide properties
   • foam properties
   • aero properties
   Note: The Compression Quality, Cache Directory, and Cache Name attributes should have been set automatically when the original cache was created. They should not be changed when appending to an existing cache.
2. Set the current frame to last frame cached on disk.
3. Set the end of the time slider's playback range to the last frame of the range that you want to cache.
4. Play forward from the current frame.