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FumeFX 7.5 Update: Faster GPU Simulation and New Post-Load Tools
POSTED 6th OF Oct, 2026, Posted by Summer Magdaraog
Sitni Sati has released FumeFX 7.5, introducing a new GPU solver and several tools for working with cached simulations after they are loaded.
The update adds the Multigrid PCG solver, Fast Upres, Retimer, and Memory Cache. It also improves shader sharpening, post processing, VDB workflows, and scattering, while fixing a range of cache, retiming, rendering, viewport, and stability issues.
What's New in FumeFX 7.5
Multigrid PCG Solver
FumeFX 7.5 adds a new Multigrid PCG solver for GPU simulations, with up to 2× the GPU simulation speed compared with PCG, according to Sitni Sati.
The previous CG solver has also been retired.
Fast Upres for Cached Simulations
Fast Upres adds detail to cached simulations when they are loaded, without requiring the simulation to be re-run.
Retimer for Cached Simulations
The new Retimer changes the playback speed of cached simulations without re-caching them.
This allows playback timing to be adjusted without generating a new cache.
Memory Cache for Interactive Editing
FumeFX 7.5 introduces a Memory Cache that keeps loaded frames in RAM.
This keeps Upres, Retime, and Sharpen interactive during playback and timeline scrubbing.
Post Load and Post Processing Updates
Shader sharpening has been moved to the new Post Load rollout and is now unified across all FumeFX shaders.
The Post Processing rollout adds options to bake Retime, Fast Upres, and Sharpen using the same settings as the Post Load rollout.
Live cache retiming has also been moved to the Post Load rollout, allowing playback speed to be adjusted interactively without re-baking.
VDB and Scattering Improvements
FumeFX 7.5 adds a new multiple scattering algorithm and removes the Maximum Depth parameter.
VDB workflow improvements include:
- A Y-Up option for importing .vdb caches from other applications.
- VDB channel assignments are remembered when the same cache file is selected again.
- A new VDB Channel Assign button allows channels to be reassigned directly without going through the FumeFX menu.
Fixes in FumeFX 7.5
The update also addresses issues affecting cache files, retiming, VDB workflows, shaders, rendering, viewport updates, and application stability.
Cache and Retime Fixes
- Fixed Y-axis inversion when exporting caches to .vdb and loading them again.
- Fixed incorrect Post Processing and Wavelet cache filenames when the frame-number placeholder was not at the end of the filename.
- Fixed incorrect Retime results when the Time Scale Factor was set to 1.0.
- Fixed the viewport not updating until the time slider was moved after changing Post Load parameters.
- Fixed Delete Wavelet and Delete Post Processing cache buttons not deleting files.
- Fixed the cache browse menu not listing cache sequences using frame padding other than four digits.
VDB, Shader, and Stability Fixes
- Fixed the VDB Channel Assign button not opening when a .vdb cache was loaded.
- Fixed Arnold shaders not applying Post Load changes when re-rendering the same frame.
- Fixed a crash when switching the FumeFX shader type while no material was assigned.
- Fixed FumeFX Settings failing to open when a locked, duplicate preferences node was present in the scene.
FumeFX 7.5
FumeFX 7.5 focuses on faster simulation and more control over cached results. The Multigrid PCG solver improves GPU simulation speed, while Fast Upres, Retimer, and Memory Cache make it possible to refine, retime, and review cached simulations without repeatedly rebuilding the original cache.
The update also improves VDB handling, shader sharpening, post processing, and scattering, alongside fixes for cache management, rendering, viewport behavior, and stability.