[Sidefx-houdini-list] connect all verts w/ a specific attribute

Andy Nicholas andy at andynicholas.com
Tue Feb 3 06:05:21 EST 2009


The partition SOP might be useful too.

A


> In the add sop, under the Polygons|By Group, you can set By Attribute and
> then put in the Attribute Name.
>
> Does this not do what you need?
>
> T
>
>
> ----- Original Message -----
> From: "Michael K O'Brien" <mobrien at pixar.com>
> To: sidefx-houdini-list at sidefx.com
> Sent: Monday, February 2, 2009 5:02:08 PM GMT -08:00 US/Canada Pacific
> Subject: Re: [Sidefx-houdini-list] connect all verts w/ a specific
> attribute
>
> Hola~
>
>> -----Original Message-----
>> From: sidefx-houdini-list-bounces at sidefx.com
>> [mailto:sidefx-houdini-list-
>> bounces at sidefx.com] On Behalf Of Andrew D Lyons
>> Sent: Monday, February 02, 2009 4:44 PM
>> To: sidefx-houdini-list at sidefx.com
>> Subject: Re: [Sidefx-houdini-list] connect all verts w/ a specific
>> attribute
>>
>> Hi,
>>
>> You can group points by attribute (using the expression option). ie.
>> $ID=1
>> etc
>> Then you can filter out those points, apply an add sop selectively
>> etc. It kind of depends on what sort of connection you want from
>> there...
>
> Doesn't that imply I know how many add sops I need to create? For example,
> if I create a pop network with three split nodes in it. I want to connect
> all of the points with the same parent value. The number of different
> parent
> values depends on how long the sim has run, and the probability of a child
> being born.
>
> If I do the following:
>
> 	POP -> copy spheres -> attrib promote parent -> for each (add inside
> of foreach)
>
> I get what I want. The foreach fires for each distinct parent value. I
> want
> to do that same thing without having to make everything a primitive value.
>
> MO
>
> --
> Michael K O'Brien
> mobrien at pixar.com
> Pixar
>
> LARRY THE CABLE GUY: I believe... that sometimes you've got to wreck the
>                      truck to get the insurance money to make the truck
>                      payment.
>
>>
>> Cheers
>>
>> 2009/2/2 Michael K O'Brien <mobrien at pixar.com>:
>> > Hola~
>> >
>> > I'm trying to connect all points with the same attribute value with a
>> line.
>> > The points are from a particle simulation. The attribute value is
>> sparse,
>> > and I don't know how many different values I have on the particles.
>> >
>> > Is there a way to do this?
>> >
>> > I tried the foreach sop, but it only wants to iterate on primitive
>> attrs
>> or
>> > primitive groups. Copying a primitive per particle, then using a
>> foreach
>> > works, but seems really clunky.
>> >
>> > I'm about to start diving into the HDK or Python to write a node that
>> does
>> > this. However, it seems like something Houdini would already do. What
>> am
>> I
>> > missing?
>> >
>> > MO
>> >
>> >
>> > --
>> > Michael K O'Brien
>> > mobrien at pixar.com
>> > Pixar
>> >
>> > LARRY THE CABLE GUY: I believe... that sometimes you've got to wreck
>> the
>> >                     truck to get the insurance money to make the truck
>> >                     payment.
>> >
>> >
>> > _______________________________________________
>> > Sidefx-houdini-list mailing list
>> > Sidefx-houdini-list at sidefx.com
>> > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>> >
>>
>>
>>
>> --
>> =======================================
>> Andrew D Lyons | Digital Artist | http://www.tstex.com
>> =======================================
>> _______________________________________________
>> Sidefx-houdini-list mailing list
>> Sidefx-houdini-list at sidefx.com
>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>
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