[Sidefx-houdini-list] two keyframed expressions on a single parameter

Dan Wills gdanzo at gmail.com
Tue May 24 21:23:38 EDT 2011


Backtick-style expression values can be seen by using the middlemouse button
rather than left, though I've only been able to actually create backtick
expressions on string parms. Maybe that will still help a little :)
dan

On Wed, May 25, 2011 at 3:07 AM, Andrew Lyons <tstexture at gmail.com> wrote:

> Here's the thing. There are 2 ways to put an expression on a parm:
>
> 1./ Backtick contained expression
> * no keyframe
> * parm does not turn green
> * you cannot toggle the display to see the expanded value though...
>
> 2./ Expression on keyframe
> * Single keyframe with expression function attached. fit01() and sturb()
> are
> just as valid as cubic() and bezier().
> * Can have multiple keyframes with unique expressions per segment.
> * you can toggle the display to see resolved value at any frame.
> The confusion came about for many (myself included) post Houdini v9 when
> there were some changes to the way parms were displayed, and with the
> addition of automatic keyframing of expressions in the new UI code. I used
> to only use the first approach, but these days Houdini will keyframe an
> expression by default - perhaps because it's very desirable to see the
> expanded value. You then however run the risk however of setting multiple
> keys. It's also not simple to cut and paste an expression from one mode to
> another because of the auto-insertion of backslash escapes around certain
> characters in the second mode. It's kind of tricky. To use the first mode
> these days you have to RMB and manually delete the channel from the parm to
> preserve the original expression. I sometimes have two instances of a node
> with the same expression in each node - one in each style so that I can
> edit
> one, but see the expanded value in the other. I cut and paste the changes
> in
> the first to the second as I go.  :\
>
> Cheers
>
>
>
> 2011/5/24 Pablo Giménez <pablogipi at gmail.com>
>
> > No Tom you are not crazy.
> > Thsi has happened to me lot of times, a really annoying problem.
> > I think would be nice to have an option in the preferences to avoid
> having
> > keyframes and expressions in the same channel.
> > Most of the times is an error.
> >
> >
> > 2011/5/20 Tom Nixon <ignivomous at gmail.com>
> >
> > > Hey all,
> > >
> > > It seems at work as though I'm the only person who accidentally creates
> > > multiple keyframed expressions in my parameters on different frames
> when
> > > working with OTLs. This will usually be caught after wasting a day
> trying
> > > to
> > > figure out why something is breaking only to discover that there is a
> > > keyframed expression on frame 17 that does not work any longer and the
> > new
> > > functional expression is at frame 0.
> > >
> > > My coworkers are probably starting to think I'm insane. Does anyone
> else
> > > ever have this happen? Does anyone know what is causing this to happen
> > (as
> > > I
> > > have not yet been able to reproduce this intentionally)?
> > >
> > > Thanks,
> > > Tom
> > > _______________________________________________
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> > >
> >
> >
> >
> > --
> > Un saludo
> > Best Regards
> > Pablo Giménez
> >  _______________________________________________
> > Sidefx-houdini-list mailing list
> > Sidefx-houdini-list at sidefx.com
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> >
>
>
>
> --
> =======================================
> Andrew D Lyons | Digital Artist | http://www.tstex.com
> =======================================
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