[Sidefx-houdini-list] Procedural primitive group deletion

Antoine Durr antoine at floqfx.com
Wed Feb 18 18:18:42 EST 2009

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  

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
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-- Antoine

Antoine Durr
Floq FX Inc.
10659 Cranks Rd.
Culver City, CA 90230

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