Forums Technical Discussion Delete Pieces with a volume smaller x

Delete Pieces with a volume smaller x

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piosbenni
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I want to delete all pieces of packed geometry with a volume smaller than x. I tried the measurement sop on packed geometry but it does not return any values.

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goingbananas
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Where is your network showing how you try to delete the small pieces using the measure sop? I looked at your attached project and couldn't find it.
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mestela
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Yep, its REALLY annoying, asked for this to be a feature ages ago, no dice.

You'll either need to unpack, or use the intrinsics, or do a for each bound and transfer measure data, it really should be easier than this.
Edited by mestela - March 3, 2021 17:12:50
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piosbenni
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goingbananas
Where is your network showing how you try to delete the small pieces using the measure sop? I looked at your attached project and couldn't find it.
Sorry forgot to include that was just a delete sop with a @volume<2 but it only deletes the primitives and not the whole piece so I am stuck with open pieces.
Edited by piosbenni - March 4, 2021 00:56:15
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tamte
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you already have @class attribute so before packing you could do Measure SOP and change Accumulate to Per Piece, then your Blast @volume<2 would delte whole pieces whose volume is < 2 instead of individual polys, then your pack node will just pack whole pieces that are left

however your pieces are not really connected (enclosed/watertight), so connectivity splits the geo into many open pieces, but once you fix that it should work
Edited by tamte - March 4, 2021 01:33:23
Tomas Slancik
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Soothsayer
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mestela
Yep, its REALLY annoying, asked for this to be a feature ages ago, no dice.

You'll either need to unpack, or use the intrinsics, or do a for each bound and transfer measure data, it really should be easier than this.

I think we should have some basic statistics functions or intrinsics available. min/max, average, etc. It becomes really tiring to noodle with att promotes or detail wrangles just for these things. I did a feature request a while ago. It would be so useful in this case too.
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piosbenni
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mestela
Yep, its REALLY annoying, asked for this to be a feature ages ago, no dice.

You'll either need to unpack, or use the intrinsics, or do a for each bound and transfer measure data, it really should be easier than this.

I think we should have some basic statistics functions or intrinsics available. min/max, average, etc. It becomes really tiring to noodle with att promotes or detail wrangles just for these things. I did a feature request a while ago. It would be so useful in this case too.
Thank you, with some tinkering it worked. Sorry for the delay.
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vusta
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bit fiddly, be nice if it works straight off the shelf.

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piosbenni
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vusta
bit fiddly, be nice if it works straight off the shelf.
Yes, thanks
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mestela
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Make sure to send an email to support@sidefx.com asking for the measure sop to measure volume of packed geo. The more customers who ask the more it'll bubble to the top of the to-do pile...
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Librarian
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@piosbenni
Old Stuff or , maybe it Helps?

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piosbenni
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mestela
Make sure to send an email to support@sidefx.com asking for the measure sop to measure volume of packed geo. The more customers who ask the more it'll bubble to the top of the to-do pile...
Okay I will write to them
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piosbenni
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@piosbenni
Old Stuff or , maybe it Helps?
Yes thank you the vex worked to
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Alexander_Nguyen
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 int npts = npoints(0);
float volume;
for(int i = 0; i < npts; i++){
    float bounds[] = primintrinsic(0,"bounds",i);
    vector min = set(bounds[0],bounds[2],bounds[4]);
    vector max = set(bounds[1],bounds[3],bounds[5]);
    float x = max.x-min.x;
    float y = max.y-min.y;
    float z = max.z-min.z;
    volume = x*y*z;
    setpointattrib(0,"volume",i,volume,"set");
    if(volume < chf("volume_limit")){
        removepoint(0,i);
    }
    
    
}
Edited by Alexander_Nguyen - March 15, 2021 00:49:32
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