[Sidefx-houdini-list] particles

Peter Robbinson probbins at sympatico.ca
Sun May 13 23:37:55 EDT 2007


The point numbers changes over time, the particle ID doesn't. So
identify the particles in the textured group by $ID.


PeterR


On Mon, 2007-05-14 at 11:00 +0930, jason lam wrote:
> much appreciate your interest and help
> 
> its quite simple, its just particle sop feeding into a copy sop which
> copies a plain old grid.  it copy stamps a W coordinate per grid.
> then that all goes into sort sop which orders particles based on
> proximity to an animated point
> 
> then i've got another point sop which i'm using to change the W
> coordinate for all point numbers within an arbitary value (75
> currently) which means that the 75 closest particles to the animated
> point changes texture.
> 
> This is all great, however i want it so that once it changes texture,
> it doesn't change back.
> the prob is with the if expression i'm using
> if($PT<75, 3, $VARW)
> that once the point moves away, the texture changes back
> i can't work out how to either set a flag so that once it changes it
> can't go back.
> 
> Jais
> 
> On 5/14/07, jtalbain at singnet.com.sg <jtalbain at singnet.com.sg> wrote:
> > Jason, could you give more details about the initial conditions about the
> > particles, and how they are generated etc.? I'm also trying it out here, but
> > not getting much luck.
> >
> > Regards,
> > Alvin
> >
> > --- jason lam <j.lam81 at gmail.com> wrote:
> >
> > > nah  doesn't work, at least the way i'm doing it... cause once the
> > > obj moves
> > > away again, the condition is no longer true and it gets turfed out
> > > of the
> > > group.
> > >
> > > must be missing something silly....
> > >
> > > Jason
> > >
> > > On 5/12/07, Peter Robbinson <probbins at sympatico.ca> wrote:
> > > >
> > > > I would think that if you stuff your selected points into a group,
> > > that
> > > > would do.
> > > >
> > > > PeterR
> > > >
> > > >
> > > > On Sat, 2007-05-12 at 15:58 +0930, jason lam wrote:
> > > > > Hi guys looking for some ideas
> > > > > again working on Touch so no POPs only particle SOP
> > > > >
> > > > > so i ahve a bunch of particles, and i run a sortsop through it,
> > > and
> > > > based on
> > > > > proximity to a point, i want to change the particles texture.
> > > Which is
> > > > > fine. i use an if statement that goes if($PT<100), 3, $MAPW in
> > > the point
> > > > > sop.
> > > > >
> > > > > however once the object moves, then the particles change back to
> > > their
> > > > > original $MAPW, obviously
> > > > >
> > > > > so how do i make it so that once $MAPW is changed to 3 then it
> > > doesn't
> > > > ever
> > > > > change back?
> > > > >
> > > > > ideas much appreciated
> > > > >
> > > > > cheers
> > > > >
> > > > > Jais
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-- 
"gravity is not a force, it is a boundary layer"
"everything is coincident"
"Love: the state of suspended anticipation"
"To get any appreciable distance from the Earth in 
a sensible amount of time, you must lie."





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