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The Vellum I/O SOP is designed to streamline the common operation of packing a Vellum stream, saving it to disk, and giving an option to use the saved sequence rather than the live sequence.
The third input wires directly to the third output and is not cached to disk.
Vellum simulations consist of both the geometry being simulated, but also the set of constraints applied to the geometry. In order to restart a simulation the constraints are required, but it is a lot less storage to only store the raw geometry.
Store an unpacked sequence of geometry which is just the Vellum geometry. In this mode, the second output will always be empty.
Packed Geometry and Constraints
Pack the incoming geometry and constraints wires into two packed primitives. This pair of packed primitives is then saved as a single sequence of geometry, providing access to the potentially animated constraints. The constraints allow the simulation to be restarted and allow the visualization of the state of the constraints when loading a cached simulation.
In this mode, the first output and second output will be the unpacked geometry and constraints respectively.
Load from Disk
Switches between importing fields from DOPs and loading the fields from the geometry file.
If you start a render, it will always use the Import option, ignoring this parameter.
How this node reads/writes the geometry to/from the disk file.
This parameter is only enabled when Load From Disk is disabled.
Writes the file if it doesn’t exist, reads it if it does exist.
This is useful for caching, where the node will write the cache to disk the first time it cooks, and use the cache file from then on.
To force a refresh of the cache, manually delete the file on disk.
Reads the geometry from the file. If the node’s input is connected, it’s ignored.
Writes the input geometry to disk.
No file access will occur. Pass through the input geometry to the output, like a Null surface node.
Where to load the fields from when in Load from Disk mode. This also controls where the Geometry ROP will save the fields.
Save to File
Load From File