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find center point

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Hi Doanh,

the attribute promote SOP can calculate the average of an (position) attribute. And a VEX solution would be to expandpointgroup():

int pts[] = expandpointgroup(0, 'group2');
vector pos_avg = vector(0.0);
foreach(int pt; pts){
    pos_avg += point(0, 'P', pt);
pos_avg /= len(pts);

addpoint(0, pos_avg);


find centerPoint_KM.hipnc

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