[Sidefx-houdini-list] Slide over Geometry

A Daly andaly.sidefx at gmail.com
Fri Apr 13 10:22:55 EDT 2007


Thanks everyone for all the suggestions. I will try them out.

On 4/11/07, Pablo Giménez <pablogipi at gmail.com> wrote:
>
> 2007/4/11, CraigLeeHoffman at aol.com <CraigLeeHoffman at aol.com>:
> >
> >
> > Depending on what you want to do, you could animate particles in flat
> > plane
> > above the geometry and project them down.  This is quick and dirty but
> may
> > look weird if you have a lot of height fluctuations since the particles
> > will
> > move "faster" in those areas.
>
>
> I have used thi method some times and is very useful to stick particles to
> a
> surface, but depending the size of the surface and the number of particles
> the ray SOP (is the tool I have used to project the particles over the
> surface), could be slow.
> I think tha fast way is to use the Creep POP, but  usually it needs more
> time to setup because working in UV space to move particles around is not
> so
> intuitive than using forces, velocities, etc ... Anyway Creep POP is very
> very fast.
>
> -Craig
> >
> > In a message dated 4/11/2007 12:09:55 A.M. Eastern Daylight Time,
> > andaly.sidefx at gmail.com writes:
> >
> > I used a  trace SOP to create geometry from an image. The geometry has
> > fluctuations  in height (waves in it). I want a particle to glide over
> the
> > surface of  this geometry going up and down with the fluctuations. I've
> > attempted using  the Creep SOP within the POP network with no luck. Any
> > suggestions for an  alternative way to get the particle to stick to the
> > surface? I've heard of  using primUV but don't know much about how  that
> > works.
> >
> > Thanks
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> >
> >
> >
> >
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>
>
> --
>
> Un saludo
> Best Regards
> Pablo Giménez
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