Re: Particle attraction

[Bradley Gabe <withanar(at)stanwinston.com>]

Oh ye of little faith!

1) Set up your particle sim in Maya or Houdini, render it out
2) Get>Primitive>Grid
3) Get>Material>Constant
4) Get>Texture>Image
5) Map the effect onto the grid in XSI

viola!

> yep, 1996. And most of the effects in this movie cannot be done in XSI 
> today.
>
> Vincent Fortin wrote:
> >>> Hope it's still in theaters
> >>>       
> > Gulp... 1996!
> >
> > -----Original Message-----
> > From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf
> > Of Vincent Fortin
> > Sent: Wednesday, May 02, 2007 4:58 PM
> > To: XSI(at)Softimage.COM
> > Subject: RE: Particle attraction
> >
> > Ah good to know, Francois. Hope it's still in theaters. Is it
> > stereoscopic by any chance?
> >
> > Just a precision: in Maya, any force field can be applied
> > "per-particle". And each parameter on that force can be controlled
> > "per-particle" so you can have 1,000+ different newtons affecting your
> > particle cloud.
> > It's quite useful for making flying pollen over a wheat field for
> > example. Every time I have to do this in XSI I end up animating a bunch
> > of Eddies manually. Even with expressions, the turnaround time is still
> > much slower compared to the procedural nature of a particle system. Ohh
> > well... had to rant a little...
> >
> > -----Original Message-----
> > From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf
> > Of Francois Lord
> > Sent: Wednesday, May 02, 2007 4:38 PM
> > To: XSI(at)Softimage.COM
> > Subject: Re: Particle attraction
> >
> > If I'm not mistaken, this Maya force is the Newton force. Essencially 
> > taken from Dynamation, this force applies the laws of gravity to each 
> > particle so they are attracted to each other in an orbiting fashion.
> >
> > <OT>
> > There was a great demonstration of this force in the Imax movie Cosmic 
> > Voyage when matter in the universe begins to form chunks after the Big 
> > Bang. It took a super computer several weeks (if not months) to simulate
> >
> > this scene. It was awsome.
> > </OT>
> >
> > Vincent Fortin wrote:
> >   
> >> I'd dare to say it's impossible with XSI's actual toolset. I just 
> >> tried inversing the particle avoidance parameter in the spdl but no
> >>     
> > luck L
> >   
> >> The behavior is definitely scriptable but, again, probably not worth 
> >> it because of the speed.
> >>
> >> I'd like to see something like Maya's per-vertex fields in XSI. I did 
> >> some bubbles once where bubbles with a size bigger than a given 
> >> threshold would start attracting the other bubbles around them. It's 
> >> surprising how fast Maya manages this when you consider that, with 
> >> each particle carrying its own set of force attributes, the simulation
> >>     
> >
> >   
> >> iterations go exponent 2.
> >>
> >>
> >>     
> > ------------------------------------------------------------------------
> >   
> >> *From:* owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] *On 
> >> Behalf Of *Dan Hope
> >> *Sent:* Wednesday, May 02, 2007 10:02 AM
> >> *To:* xsi(at)Softimage.COM
> >> *Subject:* Particle attraction
> >>
> >> Ola Senors i Senorita(s)
> >>
> >> I'm trying to get particles of the same pType to attract each other 
> >> based on distance and wander around in small groups. I'm not animating
> >>     
> >
> >   
> >> teenagers with White Lightning before you ask...
> >>
> >> Anyone got any ideas?
> >>
> >> Ta
> >>
> >> Dan
> >>
> >>
> >>     
> > ------------------------------------------------------------------------
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> >>     
> >
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-- 
Bradley R. Gabe | Senior Creature TD | Stan Winston Studio