[Sidefx-houdini-list] Invert metaball kernel effect with force SOP

Pablo Giménez pablogipi at gmail.com
Tue Jul 5 11:27:09 EDT 2011


Thanks for your responses.
I end up doing my own attracto with a VOP POP and into it using meta weight
to make complement of the metaball weight.

2011/7/5 Olex P <hoknamahn at gmail.com>

> Arrhhh sorry. Invert the kernel function. Point clouds in VEX can help
> with that.
>
> On Tue, Jul 5, 2011 at 3:51 PM, Olex P <hoknamahn at gmail.com> wrote:
> > Hey Pablo,
> >
> > Can't you just make the weight of metaball negative? I've been using
> > both positive and negative weights on metaballs for the force fields
> > in the past and they seem to work well.
> >
> > Cheers,
> > Alex
> >
> > On Tue, Jul 5, 2011 at 3:27 PM, teresuac <teresuac at gmail.com> wrote:
> >> Can't you do that in a vop force with meta weight or with a meta loop
> >> Maxime
> >>
> >> 2011/7/5 Pablo Giménez <pablogipi at gmail.com>:
> >>> Thanks Edward and Mark.
> >>> This options are all right if you are doing your own kernel function in
> HDK
> >>> (Mark), or you have access to the density of the metaball in a volume
> >>> (Edward).
> >>> What I am saying is that if you want to use a metaball to define a
> force
> >>> field, to be used in a particle SOP, attractor POP, etc ... the radial
> force
> >>> is always defined from the kernel to the boundaries. But I want to do
> the
> >>> opposite without making my own kernel function in the HDK or using
> volumes.
> >>> Just any way to inverse the kernel function or tell the force SOP to
> use the
> >>> inverse kernel function.
> >>>
> >>> 2011/7/5 Edward Lam <edward at sidefx.com>
> >>>
> >>>> On 05/07/2011 9:38 AM, Pablo Giménez wrote:
> >>>>
> >>>>> Probably is somethign fairly easy but seems that there is no way
> invert
> >>>>> the
> >>>>> kernel function for a metaball.
> >>>>>
> >>>>
> >>>> 1.0 - density?
> >>>>
> >>>> -Edward
> >>>>
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> >>>>
> >>>
> >>>
> >>>
> >>> --
> >>> Un saludo
> >>> Best Regards
> >>> Pablo Giménez
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-- 
Un saludo
Best Regards
Pablo Giménez



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