However, this route may still be very useful for smaller amounts of whitewater. Particle system cache files are much larger than our own compact file format and can lead to slow frame loading. A downside of this method is that there can be some severe performance penalties for particle caches with a large amount of whitewater particles. This may require some reverse-engineering in order to understand the format of the particle system cache files. A workaround could be to have the simulator store (or convert) the whitewater simulation directly as a Blender Particle System Cache. For this reason, the whitewater particles are implemented as vertex meshes, but unfortunately these cannot be rendered with motion blur. The Blender Python API is currently not flexible enough for us to directly control the motion of a custom particle system for the whitewater feature. Particle systems can be rendered with motion blur. Implement whitewater particles as a Blender particle system.Note: this would require us to develop our own Alembic exporter external to Blender's exporter since the internal exporter would not support exporting motion blur data. A potential workaround would be for us to add a feature to export the FLIP Fluids cache as an Alembic cache that contains motion blur data. As of October 2019, there has been some recent developer activity on this feature. Blender developers are working on adding support for rendering motion blur data attached to an Alembic (.abc) cache: Cycles: add support for rendering deformation motion blur from Alembic caches. Export motion blur data into an Alembic cache.See the topic above ( Experimental Motion Blur Support). Update (2): this potential solution is no longer needed. See the FLIP Fluids Sidebar Helper > Geometry Node Tools > Initialize Motion Blur operator to automatically set up motion blur rendering.Īlternative: A popular workaround is to add motion blur as a post-processing effect using software such as Adobe After Effects, DaVinci Resolve, and ReelSmart Motion Blur.See our Motion Blur and Attributes example files for basic Blend file setups including notes.See the Domain Attributes and Data Settings > Motion Blur Rendering: Automatic Setup documentation for how to quickly get started with motion blur rendering.See the FLIP Fluids Preferences > Developer Tools documentation for affected features, a workaround to this bug, and how to enable these features. However, these features are hidden by default due to a current bug in Blender that can cause frequent render crashes or incorrect renders when using these features. Current Motion Blur SupportĪs of FLIP Fluids 1.5.0 (0) in Blender 3.1 or later, Cycles motion blur support has been improved and is supported on both the liquid surface and whitewater (foam/bubble/spray/dust) particles by exporting and using the FLIP Fluids velocity attribute. This page documents the current status of motion blur support.
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