[Sidefx-houdini-list] disappearing HDA parameters

Michael Goldfarb goldfarb at coredp.com
Wed Jun 4 11:01:47 EDT 2008

this seems to happen if the HDA in the hip file has parameters with 
channels but them the definition of the HDA changes and those parameters 
are removed...Houdini tries to retain the animation on those parameters 
by creating spare channels.

the only way to ensure that this doesn't happen is to never remove (or 
rename) parameters - just make them invisible
HDAs need to be managed as strongly as one would code...versioned, 
limited ability to edit...keep them secret, keep them safe...

paul simpson wrote:
> this was driving me mad months ago during alpha/beta.  i'm very concerned to
> hear it's still an issue - it screwed up a pipeline on a large job.  what
> was once bullet proof has now become flaky.  sesi, whats the offical line
> here:  is this a know bug that is actively being worked on - where do we all
> stand here??
> -paul
> 2008/6/4 Pete Wallace <pies4peter at hotmail.com>:
>>The things that keeps getting us at the moment isHDA parmsgetting turned
>>intoSpare Parmsfor no obvious reason I can see...This seems to happen when
>>re-opening a Hip file,   and can sometimes be fixed by   opspareds ""
>>/obj/myhda- but is still a hassle(Love H9 otherwise though)        :-)Pete
>>Pete Wallace
>>pies4peter at hotmail.com
>>mob. 07759 039 167> Date: Tue, 3 Jun 2008 18:32:43 -0400> From:
>>jerry at intelligentcreatures.com> To: sidefx-houdini-list at sidefx.com>
>>Subject: Re: [Sidefx-houdini-list] disappearing HDA parameters> > Yeah I've
>>come across this.> > When given the option to create an HDA from a material
>>I first did it> in the type properties, but it didn't show up at all and
>>preferred to> be done in the edit parameters place. So yeah, off you go to
>>re-create> them all over again.> > ----- "Peter Bowmar" <pbowmar at gmail.com>
>>wrote:> > Hi Jerry,> > > > Anything you want to keep, parameter-wise, needs
>>to be done in the> > Type Properties. Then it's saved to the HDA. I've been
>>bitten by this> > a couple of times. The Edit Parm INterface is a
>>double-edged sword,> > it> > giveth but often taketh away too, if you're not
>>paying close> > attention.> > > > Cheers,> > > > Peter B> > > > 2008/6/3
>>Jerry Corda-Stanley <jerry at intelligentcreatures.com>:> > > When I load an
>>otl that I have created in another Houdini scene file> > and drop> > > the
>>HDA into my new session the parameters I have created don't show> > up.> >
>>>>>>Is this because I should have created them in the type properties> >
>>dialog,> > > or should I create them in the edit parameter interface menu?>
>>>>>>>I'm a little unclear where you should construct your HDA parameter>
>>>interface> > > as there seems to be two possible areas to do this.> > >
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Michael Goldfarb                            email: goldfarb at corefa.com
c.o.r.e. digital pictures                        http://www.coredp.com
"Unless you're an astronaut, secret agent, vampire hunter,
or all three, you're probably a sellout; screw you."
- Maddox 2003

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