[Sidefx-houdini-list] Create attribute (primuv, primnum) similar to scatter sop does?

Nikita Musatov not.a.whale at gmail.com
Thu Feb 13 09:34:48 EST 2014


You are welcome!!!

2014-02-13 18:22 GMT+04:00 Dominik Kirouac <dk at shedmtl.com>:
> Thanks for the help Mike and Nikita!
>
> Really like this new xyzdist node :) I will also use it wherever I can.
>
>
>
> *Dominik Kirouac // SHED **
> *FX Artist
> 1410, RUE STANLEY, 11E Étage MONTRÉAL (QUÉBEC) H3A 1P8
> T 514 849-1555 F 514 849-5025 WWW.SHEDMTL.COM <http://www.shedmtl.com/>
>
>
>
> Le 12/02/2014 4:02 PM, Michael Dunkley a écrit :
>
>> In my experience, yes - considerably faster and more exact.  Lattices
>> always involves averaging between multiple points, but barycentric lookups
>> are just that - lookups - no interpolation beyond the specific polygon the
>> point is stuck to.  Last I was on a bird feathering project where we
>> switched the rig from a point lattice to barycentric uv lookups - the
>> feathers stopped floating off the skin and the whole thing was at least 10
>> times faster. i pretty much use that type of setup wherever i can.
>>
>> m
>>
>>
>> On Wed, Feb 12, 2014 at 3:54 PM, Dominik Kirouac <dk at shedmtl.com> wrote:
>>
>>> Thanks Mike,
>>>
>>> xyzdist is exactly what I was searching, it should be more precise than a
>>> lattice using point method?
>>>
>>>
>>>
>>>
>>> *Dominik Kirouac // SHED **
>>> *FX Artist
>>> 1410, RUE STANLEY, 11E Étage MONTRÉAL (QUÉBEC) H3A 1P8
>>> T 514 849-1555 F 514 849-5025 WWW.SHEDMTL.COM <http://www.shedmtl.com/>
>>>
>>>
>>> Le 12/02/2014 3:15 PM, Michael Dunkley a écrit :
>>>
>>>   Hey Dominik, the easiest way I know of is the "xyzdist" VOP / Vex
>>>>
>>>> function.
>>>>    It'll find the closest position on a geometry to your point and give
>>>> back
>>>> the barycentric coordinates.  "intersect", the VOPS version of ray,
>>>> should
>>>> also work, so long as you know the vector you're projecting along.
>>>>
>>>> Best,
>>>> Mike
>>>>
>>>>
>>>> On Wed, Feb 12, 2014 at 3:03 PM, Dominik Kirouac <dk at shedmtl.com> wrote:
>>>>
>>>>   Hey all,
>>>>>
>>>>> Here is the problem, we have curves (hairguides) import from another
>>>>> software(xsi) with alembic. We create a group of points with the root
>>>>> of
>>>>> each hair and we are trying to make this group stick to the deforming
>>>>> geometry.
>>>>>
>>>>> I want to replicated one of the behavior of the scatter sop(create
>>>>> primuv
>>>>> attribute on points and primnum).
>>>>>
>>>>> Is there a way we can get these informations from the closest geometry
>>>>> using a ray sop or expressions ?
>>>>>
>>>>> Thanks
>>>>>
>>>>>
>>>>> *Dominik Kirouac // SHED **
>>>>> *FX Artist
>>>>> 1410, RUE STANLEY, 11E Étage MONTRÉAL (QUÉBEC) H3A 1P8
>>>>> T 514 849-1555 F 514 849-5025 WWW.SHEDMTL.COM <http://www.shedmtl.com/>
>>>>>
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