hi, i have a swiming point geometry, doing connectivity SOP with attribute "class", then i use a Partition SOP with "group_$CLASS", after this i get different $CLASS of group refer to connectivity, OK! now I want to delete the “group” that have biggest or smallest primitive, how can i do that without manually selected ?

Thanks

I'm not 100% sure what it is exactly you want to do, but these are the kind of things you will need:

You will need a measure sop to measure the area of each primitive.
Then you will need an attributepromote, promoting the “area” to “area_max”, from primitive to detail. Do not delete the original attribute. You may need to promote area_max back down from detail to primitive.

Then in a delete sop you can set an expression that if $AREA == $AREA_MAX
the biggest piece will be deleted.

You can do the same promoting to the minimum.

Not sure what you are trying to do with the groups.

thanks for reply, from your reply i found out a way to do it.

conectivity SOP (create primitive attribute $CLASS) –> attribcreate SOP (create detail attribute $MAX_CLASS) –> attributepromote SOP (primitive $CLASS -> detail $MAX_CLASS with promotion method = “mode”) –> delete SOP ( delete with expression $CLASS != $MAX_CLASS)

then the model keep the lagest piece

thanks again