Stores a copy of the input for out-of-line use.
This stash can be used with the FollicleOp
to provide interactive feedback to whatever surfaces the follicle operator is driving.
The Input Surface is copied to a buffer space outside the domain of the conventional node graph.
The Stash Key is an address, of sorts, where another operator might find the surface.
Another operator writing to the same key may clobber the previous data.
tested in Houdini
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