[Sidefx-houdini-list] Houdini.env and external otl folder

jon parker parker.jon at gmail.com
Thu Jan 25 23:33:49 EST 2018

In the past, Houdini's internal tools could change quite a lot from
version to version, but now with asset namespaces that is less of an
issue.  However, I think it's still a good idea to match your OTL
versions to Houdini's, mostly in case you need to open an old project
that has to work exactly the way it did before.

Odd that your multiple path definition doesn't work.   In my case, the
following long HOUDINI_PATH example works for our current project (in


Each of those paths contains an "otls" subfolder that is read
automatically, without having to set HOUDINI_OTLSCAN_PATH.


On Thu, Jan 25, 2018 at 11:07 AM, Olivier Jeannel
<facialdeluxe at gmail.com> wrote:
> Hi there and thank you all for your answers :)
> As Robert mentioned I tried
> HOUDINI_PATH = "C:/ProgramData/Redshift/Plugins/Houdini/16.0.705;D:/otls;&"
> (having 2 paths in HOUDINI_PATH variable)
> But this didn't work, the hda didn't appear in the contextual menu (while
> RedShift was still present).
> On the other hand,
> HOUDINI_PATH = "C:/ProgramData/Redshift/Plugins/Houdini/16.0.705;&"
> Did the job !
> Jon, I'm a bit confuse. I wanted to create an "all version" external otls
> folder, so I don't need to duplicate at each update of Houdini
> Bad idea you think ?
> 2018-01-25 16:50 GMT+01:00 jon parker <parker.jon at gmail.com>:
>> Hi Olivier,
>> Two things:   first, if you already have HOUDINI_PATH defined as
>> "C:/ProgramData/Redshift/Plugins/Houdini/16.0.705;&", I believe you
>> can create a new line like this:
>> Second, HOUDINI_PATH should be the parent directory where you store
>> "otls", as Houdini automatically appends "otls" in its search path.
>> In your example case that would simply be "D:".  I would recommend
>> creating a folder tree called "D:/houdini16.0/otls" and point your
>> HOUDINI_PATH to "D:/houdini16.0".  This way you can keep your OTL
>> files separated by Houdini version in the case of major changes with
>> Houdini.
>> HTH,
>> Jon
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