[Sidefx-houdini-list] Procedural primitive group deletion

eetu at iki.fi eetu at iki.fi
Wed Feb 18 18:23:05 EST 2009


Or, just put a Delete SOP inside the foreach loop, with expression set to
nprims("../each1") < 20   :)

(Only the current group's geometry exists inside each loop iteration)

eetu.


> I would add a prim float attribute to the whole geometry, set it to
> 1.0; then do a foreach SOP, go by groups; attribpromote that float
> prim attribute to a detail attribute, using 'sum', which will add up
> all the 1.0's and give you your prim count in that chunk; then delete
> the whole thing if below threshold before delivering it to the
> 'foreach'.
>
> I was also thinking about another approach involving the hasprim()
> and primlist() functions, e.g. args(primlist("../previousSOP",
> pieces_0)) would give you the prim count of pieces_0, but I couldn't
> think of a way to get an answer to "if I am primitive 4, how do I get
> the answer to 'what group am I in'".  If I could, i.e. if I knew that
> primitive 4 was in pieces_3, then you could do the args(primlist()) gag.
>
> -- Antoine
>
> On Feb 18, 2009, at 2:50 PM, Rick Fuentealba wrote:
>
>> Hey gang,
>>
>> I'm looking for a way to delete primitive groups that have a specified
>> number of primitives in the group.
>> For example:
>>
>> 10 Primitive Groups:
>>    114 primitives in pieces_0
>>     88 primitives in pieces_1
>>     50 primitives in pieces_2
>>     27 primitives in pieces_3
>>    141 primitives in pieces_4
>>      8 primitives in pieces_5
>>    117 primitives in pieces_6
>>    160 primitives in pieces_8
>>      2 primitives in pieces_7
>>    129 primitives in pieces_9
>>
>> So now say I want to have the the groups with less than 10 primitives
>> deleted, in this case 5 and 7.
>>
>> Anyone have a method for this?
>>
>> Thanks,
>> Rick
>> _______________________________________________
>> Sidefx-houdini-list mailing list
>> Sidefx-houdini-list at sidefx.com
>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>
> -- Antoine
>
> Antoine Durr
> Floq FX Inc.
> 10659 Cranks Rd.
> Culver City, CA 90230
> 310/430-2473
>
>
> _______________________________________________
> Sidefx-houdini-list mailing list
> Sidefx-houdini-list at sidefx.com
> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>





More information about the Sidefx-houdini-list mailing list