RE: the Cycle thing

Date : Thu, 6 Dec 2007 16:49:41 +0100
To : <XSI(at)Softimage.COM>
From : JM Khayat - PÏNKA <jmkhayat(at)pinka-prod.com>
Subject : RE: the Cycle thing

Salut Guillaume

I hope you’re ok.

 

Thanks for your input. It’s in fact comforting us in the direction of how resolving this issue.

We did solve the IK-FK blend ala Motion builder – where the IK rig drives the FK and vice versa - with that same technique.

The tests we made so far on our in-house basic human rig are quite encouraging.

 

Did you notice some weird behavior or drawbacks on the use of this technique in production ?

 

Thanks

 

Jm

 

--- jm Khayat  / PINKA Studio ---

--- 04 50 08 41 12 / www.pinka-prod.com ---

 

 

 

From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf Of guillaume laforge
Sent: mercredi 5 décembre 2007 23:31
To: XSI(at)Softimage.COM
Subject: Re: the Cycle thing

 

Salut Jean Marc,

You can avoid the cycle issue if you don't create the relation at "animation time". Just create the relation at "manipulation time" :-).
The "On Selection Change Event" is your friend for this kind of manipulations.

Here is a quick test : http://www.vol2nuit.fr/guillaume/selection_event/selection_event

There is an inactive pose constraint on each cubes. If you select cube1, cube2 constraint is active and vice-versa.

When you select the arrow, the constraints are inactive and you can play the animation.

I never use a such "manipulation setup" in production, so maybe there is something wrong with this technique...


Cheers

Guillaume

On Dec 5, 2007 12:49 PM, JM Khayat - PÏNKA <jmkhayat(at)pinka-prod.com> wrote:

Hi all

 

Two existential questions from our TD department here :

 

First is : Is it possible to create a relation between 2 objects which are influencing each other, without creating the « cycle » issue ?

 

For example :

Obj A position influences Obj B position and Obj B position influences Obj A position back again.

 

Can we think of creating a bi-directional constraint via a Script Operator ?

 

And another one : Is it possible to create a Script operator to deal with global transformations of an object, while keeping the possibility to move this object with the Move tool in the UI ?

 

Thanks for your help

 

Jm

 

--- jm Khayat  / PINKA Studio ---

--- 04 50 08 41 12 / www.pinka-prod.com ---

 

 


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