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Subject: RE: FLASH: working on inverse kinematics/flash
From: Damien Morton
Date: Thu, 13 Jul 2000 05:01:41 +0100


Maybe when Flash 5 comes out, you'll have a chance at getting this to work.
In my experience, getting Flash to manage 20 connected springs at a
reasonable frame rate involved a whole whack of stupidly complex maths.
Without decent maths, and given how slow ActionScript can be, I think you
have no chance at all.

> -----Original Message-----
> From: owneratchinwag [dot] com [owneratchinwag [dot] com]On">mailto:owneratchinwag [dot] com]On Behalf Of Jon
> Williams
> Sent: Wednesday, July 12, 2000 10:27 PM
> To: flasheratchinwag [dot] com
> Subject: Re: FLASH: working on inverse kinematics/flash
>
>
> wow. If you're asking for what I think you're asking,
> I think you're going to need a new plug-in. You're
> talking about *mean* math.
>
> Are you sure you need to be able to programmatically
> place joints based on "hand/foot" position? That seems
> overly complicated for code that will probably end up
> only doing a small number of actions.
> (run, jump, squat, etc) It'd be easier to just define
> separate "tweens" for each by hand (probably).
>
> In the experience I've had with complex flash/math
> you're going to be *seriously* straining the plugin even
> if you DO find the equations you're looking for.
>
> I've been known to eat my words, there's some crazy
> mfs out there...i'm just sayin' good luck. *smile*
>
> -jon
>
> David Wallach wrote:
>
> > Thanks John,
> >
> > ...even with limitting the search to .edu the results are
> staggering. I may
> > have to put this off to another time /year/life/etc.
> >
> > Your might you have suggestions in terms of the implementation
> styles? Does
> > one possibly lend itself to more direct implementation for a novice? I
> > realize that *easier* is usually harder in the long run, but to
> get into it
> > initially I am looking for very simple structure, simple chains
> with very
> > basic elasticity and dampening, and firm limits on rotation.
> >
> > we looked at moho just the other day, and the bones feature is
> very cool,
> > but the idea requires interactivity, so the IK would have to be
> programatic
> > and not pure animation.
> >
> > any ideas are welcome
> >
> > thanks dave
> >
> > > At 1:02 PM 7/12/0, David Wallach wrote:
> > >> If you are into IK and flash, and are working on something,
> > >> please share the wealth! or maybe point me toward some onling
> > >> repository of IK code.
> > >
> > > I'm not sure of your exact need, but if it's creation using
> IK, then have
> > > you looked into Lost Marble's Moho tool?
> > > http://www.lostmarble.com/
> > >
> > > (Currently they have a free beta download of version 2.0,
> with watermarked
> > > results.)
> > >
> > > If you're instead trying to create a Flash application which
> offers inverse
> > > kinematics within it, then there are a few implementation
> styles and many
> > > papers. Your situation would presumably use easier equations
> because you're
> > > working in two dimensions instead of three. Implementations vary with
> > > whether there are firm or progressive or no limits on
> rotation, how you
> > > choose to handle damping along a chain, the elasticity in a
> joint, more. A
> > > web search pulls up more than you'd ever want to know about various
> > > approaches... restricting to the .edu domains can help filter
> the hits.
> > >
> > > jd
> > >
> > >
> > >
> > >
> > >
> > > John Dowdell, Macromedia Tech Support, San Francisco CA US
> > > Search technotes: http://www.macromedia.com/support/search/
> > > Offlist email risks capture by the spam filters. I may not see your
> > > email if it's not on the list. Private one-on-one email options are
> > > available via Priority Access: http://www.macromedia.com/support/
> > >
> > >
> > >
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> > flasher is generously supported by...
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > flashforward2000 and the Flash(tm) Film Festival
> > July 24-26, 2000, NEW YORK CITY, Hammerstein Ballroom
> > www.flashforward2000.com
> > Produced by United Digital Artists and lynda.com
> > Sponsored by Macromedia, Adobe Systems, Fusion, Inc, AtomFilms,
> > shockwave.com and Electric Rain.
> > 1.877.4.FLASH.4 or (1.805.640.6679 outside the US and Canada)
> > Register before June 30 and save $200!!-- www.flashforward2000.com
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > To unsubscribe or change your list settings go to
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>
>
> flasher is generously supported by...
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> flashforward2000 and the Flash(tm) Film Festival
> July 24-26, 2000, NEW YORK CITY, Hammerstein Ballroom
> www.flashforward2000.com
> Produced by United Digital Artists and lynda.com
> Sponsored by Macromedia, Adobe Systems, Fusion, Inc, AtomFilms,
> shockwave.com and Electric Rain.
> 1.877.4.FLASH.4 or (1.805.640.6679 outside the US and Canada)
> Register before June 30 and save $200!!-- www.flashforward2000.com
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> To unsubscribe or change your list settings go to
> http://www.chinwag.com/flasher or email helpatchinwag [dot] com
>


flasher is generously supported by...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
flashforward2000 and the Flash(tm) Film Festival
July 24-26, 2000, NEW YORK CITY, Hammerstein Ballroom
www.flashforward2000.com
Produced by United Digital Artists and lynda.com
Sponsored by Macromedia, Adobe Systems, Fusion, Inc, AtomFilms,
shockwave.com and Electric Rain.
1.877.4.FLASH.4 or (1.805.640.6679 outside the US and Canada)
Register before June 30 and save $200!!-- www.flashforward2000.com
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
To unsubscribe or change your list settings go to
http://www.chinwag.com/flasher or email helpatchinwag [dot] com

Replies
  Re: FLASH: working on inverse kinematics, Jon Williams

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