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

Olex P hoknamahn at gmail.com
Tue Jul 5 10:51:52 EDT 2011


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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