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

Olex P hoknamahn at gmail.com
Tue Jul 5 10:52:58 EDT 2011


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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