[Sidefx-houdini-list] Unload and the Null operator

jlait at sidefx.com jlait at sidefx.com
Tue Apr 7 09:46:50 EDT 2009

On Tue, Apr 07, 2009 at 10:40:53AM +0100, Pablo Giménez wrote:
> 2009/4/6 <jlait at sidefx.com>
> > On Mon, Apr 06, 2009 at 06:00:52PM +0200, Ben Schrijvers wrote:
> > > I geuss the Null Sop in unloaded by default and toggle theat Cache Input
> > > to ON it will behave as normal sop's and cache.
> >
> >     Close.  The Null SOP is "instanced" by default, and toggling cache
> > input forces it to make a hard copy rather than just instancing.
> >    The reason for this is precisely for unloading - if you have a
> > whole series of switch SOPs (which all instance) you may grow
> > concerned you've set all your data to unload.  So by making a null SOP
> > with Unload Off and Cache Input on, you can ensure that becomes a
> > manual checkpoint.
> So by "instanced " here it means the node pass through all the data and not
> cache it as a regular operator.
> If this is the case, I am curious, appart from Null and Switch, are there
> other SOPs which a re instanced by default?
> Also, a instanced node is the same as a node with the unload flag set?
> The unload flag is then a way to "instance" any node ina SOP network?
    Unloaded nodes delete their cache when they are done.  Instanced
nodes never have a cache, they just borrow their inputs geometry.

Nodes that may, or may not, instance, are:
        - Jeff Lait

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