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RE: RE: [Virtools] Particles / follow curve

you're right, I'll have a look in that direction..though no custom BBs
is accepted in this project arggghh...;)
Thx everybody,
Arnaud.

> -----Original Message-----
> From: David Callele [mailto:callele@cs.usask.ca] 
> Sent: jeudi 23 mai 2002 18:37
> To: arnaud@simteam.com
> Cc: virtools-user-group@lists.theswapmeet.com
> Subject: Re: RE: [Virtools] Particles / follow curve
> 
> 
> Yes, I didn't think about that issue.
> 
> If you are C++ inclined then you could extend the Modify 
> Component BB to include an option for modifying the Tunnel 
> Attribute. You can look at ParticleSystemsInteractors.cpp (
> ParticleManager::ManageTunnel(ParticleEmitter* em,float 
> deltat) )  and it appears that the attribute is an array of 
> five contiguous floating point values.
> 
> I would also suggest a free text search on "tunnel" in the 
> SDK directories to see what else you turn up.
> 
> Hope this helps....
> 
> David Callele
> 
> ----- Original Message -----
> From: "Arnaud Muthelet" <arnaud@simteam.com>
> To: "'David Callele'" <callele@cs.usask.ca>; <p.hogenboom@mcw.nl>
> Cc: <virtools-user-group@lists.theswapmeet.com>
> Sent: Thursday, May 23, 2002 9:41 AM
> Subject: RE: RE: [Virtools] Particles / follow curve
> 
> 
> > One pb I had with tunnel : we didn't find anyway to 
> dynamically change 
> > velocity value of the tunnel attribute. While calling SetAttribute, 
> > input data type is "tunnel values", and this type is not 
> recognize in 
> > "parameter op" so that it's impossible to change velocity !! Arnaud.
> >
> > > -----Original Message-----
> > > From: David Callele [mailto:callele@cs.usask.ca]
> > > Sent: jeudi 23 mai 2002 17:26
> > > To: p.hogenboom@mcw.nl; arnaud@simteam.com
> > > Cc: virtools-user-group@lists.theswapmeet.com
> > > Subject: Re: RE: [Virtools] Particles / follow curve
> > >
> > >
> > > If you can accept a "piece-wise linear approximation" to 
> your curve, 
> > > then the Particle Tunnel should suit your needs quite well. Just 
> > > adjust the parameters for each leg as you see fit.
> > >
> > > Good suggestion Patrick!
> > >
> > > David Callele
> > >
> > > ----- Original Message -----
> > > From: "Patrick Hogenboom" <p.hogenboom@mcw.nl>
> > > To: <arnaud@simteam.com>
> > > Cc: <virtools-user-group@lists.theswapmeet.com>
> > > Sent: Thursday, May 23, 2002 2:44 AM
> > > Subject: Re: RE: [Virtools] Particles / follow curve
> > >
> > >
> > > > Looking at the Particle System Interactor attributes (open the 
> > > > Attribute
> > > manager for a nice overview of what attributes are available)
> > > > I think that Particle Tunnel sounds like the thing you 
> need. The 
> > > > description in the documentation however is a tad 
> vague... <quote>
> > > > Tunnel: The Tunnel interactor conduct particles nearby thru
> > > the tunnel,
> > > accelerating or decelerating them. You can set the 
> velocity aimed by 
> > > the particles travelling in
> > > > the tunnel, the absorption radius of the tunnel, the
> > > attraction shape
> > > modifies the force of the attraction, the attraction speed, and 
> > > finally the attraction direction which
> > > > represent a force modifying the direction of the 
> particle itself. 
> > > > </quote>
> > > >
> > > > Maybe local wind or magnet could be of some use too... haven't 
> > > > used them
> > > before.
> > > >
> > > > Good luck experimenting
> > > >
> > > > Ciao, Patrick
> > > >
> > > > 5/23/2002 10:28:18 AM, "Arnaud Muthelet" <arnaud@simteam.com> 
> > > > wrote:
> > > >
> > > > >Well we tried large collection of 3DSprites .. but 
> performances 
> > > > >seriously drop down while increasing the number of sprites
> > > (and their
> > > > >attached scripts). (We need at least 500 - 1000 
> elements !) And 
> > > > >as for the deflectors, we need to handle long and complex
> > > pathways so I
> > > > >sadly believe it could be painfull to put it all together.
> > > Thank you
> > > > >anyway, Arnaud.
> > > > >
> > > > >> -----Original Message-----
> > > > >> From: David Callele [mailto:d.callele@shaw.ca]
> > > > >> Sent: jeudi 23 mai 2002 06:51
> > > > >> To: arnaud@simteam.com
> > > > >> Cc: virtools-user-group@lists.theswapmeet.com
> > > > >> Subject: Re: [Virtools] Particles / follow curve
> > > > >>
> > > > >>
> > > > >> It would be difficult to do but you could simulate a
> > > curve by using
> > > > >> various particle attractors, etc..
> > > > >>
> > > > >> Lot's of twiddling but that is one option.
> > > > >>
> > > > >> Could you just use a large collection of 3D Sprites 
> instead and 
> > > > >> tell them to follow the curve?
> > > > >>
> > > > >> David Callele
> > > > >>
> > > > >> ----- Original Message -----
> > > > >> From: "Arnaud Muthelet" <arnaud@simteam.com>
> > > > >> To: "'jean-marc gauthier'" <jean-marc.gauthier@nyu.edu>
> > > > >> Cc: <virtools-user-group@lists.theswapmeet.com>
> > > > >> Sent: Wednesday, May 22, 2002 11:39 AM
> > > > >> Subject: RE: [Virtools] Particles / follow curve
> > > > >>
> > > > >>
> > > > >> > well, I already tried that one..but in that case the
> > > > >> particles don't
> > > > >> > actually 'follow" the curve, but are "emitted from the
> > > > >> curve", which
> > > > >> > is visually rather different..what I need is particles
> > > > >> running along
> > > > >> > the curve... Thx anyway,
> > > > >> > Arnaud.
> > > > >> >
> > > > >> > ____________________________________________
> > > > >> > Arnaud MUTHELET               SIM TEAM
> > > > >> > arnaud@simteam.com            http://www.simteam.com
> > > > >> > <http://www.simteam.com/>
> > > > >> >
> > > > >> > 11 Boulevard Brune - 75014 PARIS - FRANCE
> > > > >> > tel: 33.(0)1.45.45.15.55
> > > > >> > fax: 33.(0)1.45.45.16.17
> > > > >> >
> > > > >> > ____________________________________________
> > > > >> >                   SIM TEAM
> > > > >> >  un autre regard sur la realite virtuelle
> > > > >> >
> > > > >> > ____________________________________________
> > > > >> >
> > > > >> > -----Original Message-----
> > > > >> > From: jean-marc gauthier 
> [mailto:jean-marc.gauthier@nyu.edu]
> > > > >> > Sent: mercredi 22 mai 2002 19:16
> > > > >> > To: arnaud@simteam.com
> > > > >> > Cc: virtools-user-group@lists.theswapmeet.com
> > > > >> > Subject: Re: [Virtools] Particles / follow curve
> > > > >> >
> > > > >> >
> > > > >> > Hi there
> > > > >> >
> > > > >> > You can create a curve in Virtools and turn it into a
> > > > >> particle emitter
> > > > >> > using the attribute setup. I hope this helps.
> > > > >> >
> > > > >> > Jean-Marc Gauthier
> > > > >> > http://www.tinkering.net
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >>
> > > > >
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